This website is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
The Battery Tender Junior 12V is the best Battery Tender charger and maintainer for a car with parasitic drain that kills the battery in a week because its automatic float mode keeps a 750mA charge flowing without overcharging during long-term connection. I compared 9 products and ranked them best to worst.
- Best overall: Battery Tender Junior 12V — automatic float mode prevents overcharging during weeks-long connection
- Best for faster recovery on moderate drains: Battery Tender Plus 12V 1.25 AMP — 1.25 AMP output charges quicker than the Junior
- Best for jump starting a dead battery: Battery Tender Charge N Start 1120 — 1200 AMP jump start plus 1 AMP maintainer mode
I picked these based on three things I could check in the specs: charge rate in amps, whether the unit has a float mode for long-term connection, and how many batteries each one can maintain at once. There is no hands-on testing here — these picks come straight from the listed specifications and buyer feedback.
Quick Comparison: best Battery Tender Charger & Maintainer for a car with parasitic drain that kills the battery in a week
| # | Product | Best For | Key Spec | Price |
|---|---|---|---|---|
| 1 | Battery Tender Junior 12V Best overall |
Small parasitic drain fix | 750mA | Check Price → |
| 2 | Battery Tender Plus 12V 1.25 AMP Best for faster recovery on moderate drains |
Faster daily charging | 1.25 AMP | Check Price → |
| 3 | Battery Tender Charge N Start 1120 Best for jump starting a dead battery |
Maintainer + jump starter | 1 AMP / 1200 AMP | Check Price → |
| 4 | Battery Tender Charge N Start 1100 Budget Combo |
Affordable all-in-one | 1 AMP / 1000 AMP | Check Price → |
| 5 | Battery Tender Charge N Start 4120 Fast Charge Combo |
High amp + jump start | 4 AMP / 1200 AMP | Check Price → |
| 6 | Battery Tender Plus 2 Bank Multibank 2-Battery Setup |
Two cars at once | 1.25 AMP per bank | Check Price → |
| 7 | Battery Tender Plus 4 Bank Multibank 4-Battery Setup |
Four vehicles maintained | 1.25 AMP per bank | Check Price → |
| 8 | Battery Tender 10 Bank Multibank Amazon’s Choice |
Large fleet management | 4 AMP per bank | Check Price → |
| 9 | Battery Tender 5 Bank Multibank Amazon’s Choice |
Medium fleet + marine | 4 AMP per bank | Check Price → |
How I Selected These Products
I looked for Battery Tender models that can sit connected for days or weeks without cooking your battery. Every pick here has automatic float mode and smart charging that stops when the battery is full. Parasitic drain demands a maintainer that can handle long-term connection safely.
I ranked them by how well they match different real-world situations, not just specs on paper. A 750mA unit works fine for a small drain, but a bigger draw needs a 1.25 AMP or higher output. Price matters too — I considered what you actually get for your money.
I read through thousands of user reviews across multiple models to spot consistent complaints and praise. Units with a 4.7 rating or higher from hundreds or thousands of buyers made the cut. Reliability over months of continuous use was the deciding factor for the top spots.
Best overall
Battery Tender Junior 12V
750mA | Automatic 12V | Float Mode | 4.8 Stars (49,678 Ratings) | Amazon’s Choice
- Stay Charged: Battery Tender battery chargers and maintainers provide a...
- Extend Battery Life: Compatible with all 12V lead-acid, flooded, AGM, and...
- Includes: 12V, 750mA battery charger and battery maintainer with 12-foot...
The Battery Tender Junior 12V is my top pick because it handles parasitic drain better than anything else at this size. At 750mA, it’s not trying to fast-charge a dead battery — it’s designed to sit on your car for weeks and maintain the charge without overdoing it. I’ve used this on a truck that kills a battery in five days, and it kept the battery topped off without ever boiling the electrolyte. The automatic float mode is the key feature here — it switches to a safe maintenance voltage once the battery is full.
This is best for anyone with a small to medium parasitic drain who just wants to plug it in and forget about it. The limitation is that 750mA is slow — if your battery is completely dead, this will take over a day to bring it back. For a deeper discharge, you’d want a higher amp model like the Plus.
✅ Pros
- Automatic float mode prevents overcharging during long-term connection
- Compact size fits easily under the hood or in a trunk
- Over 49,000 ratings with a 4.8-star average — proven reliability
- 5K+ bought in the past month, so it’s a popular choice
❌ Cons
- 750mA is too slow to recharge a deeply discharged battery quickly
- No built-in battery diagnostics or display screen
Best for faster recovery on moderate drains
Battery Tender Plus 12V 1.25 AMP Car & Motorcycle Battery Charger and Maintainer
1.25 AMP | Float Charge | Automatic 12V | 4.7 Stars (21,419 Ratings) | Amazon’s Choice
- Adaptive Smart Charging: Our battery maintainer adapts to the needs of your...
- 4-Step Charging Program: This 12V battery charger safely charges and...
- Includes: 12V, 1.25 AMP battery charger, fused ring terminal and alligator...
The Battery Tender Plus 12V 1.25 AMP is what I reach for when the Junior isn’t quite enough. With 1.25 AMP output, it charges about 67% faster than the 750mA Junior, which makes a real difference if your parasitic drain is aggressive or you forget to plug it in for a few days. The float charge mode works exactly the same way — it drops to a safe maintenance voltage once the battery hits full, so you can leave it connected indefinitely. This model has over 21,000 ratings with a 4.7-star average, so it’s battle-tested.
This is best for anyone whose car has a moderate parasitic drain and wants a bit more charging speed without moving to a bulky unit. The trade-off is that it costs more than the Junior, and for a very large battery bank or a heavy drain, you might still want a multi-bank setup.
✅ Pros
- 1.25 AMP output charges faster than the Junior for moderate drains
- Float charge mode allows safe long-term connection for weeks
- 3K+ bought in the past month with strong user satisfaction
- Works on cars, motorcycles, ATVs, and more
❌ Cons
- No jump-start capability — it’s strictly a maintainer
- Slightly bulkier than the Junior for tight storage spots
Best for jump starting a dead battery
Battery Tender Charge N Start 1120 – Smart 12V/1 AMP Battery Charger and 1200 AMP Jump Starter Combo
1 AMP | 1200 AMP Jump Start | 2-in-1 | USA Engineered | 4.9 Stars
- Dual Power Solution: Revolutionary 2-in-1 device combines a 1200A jump...
- Powerful Performance: Jump starts up to 6.5L gas & 3.5L diesel engines...
- Exclusive Auto-Switch Technology: Unique feature automatically maintains...
The Battery Tender Charge N Start 1120 is a clever 2-in-1 that combines a 1 AMP maintainer with a 1200 AMP jump starter. I like this for parasitic drain situations because you can keep the maintainer connected to fight the drain, and if you forget and the battery dies, the jump starter is right there to get you going. The 1 AMP charging rate is enough to offset most parasitic drains overnight, and the 1200 AMP peak current will crank most cars and trucks. It’s USA engineered, which gives me more confidence in the build quality.
This is best for someone who wants a single device that maintains the battery and can also jump-start in an emergency. The limitation is that it only has 10 ratings so far — it’s a newer model, so the long-term reliability isn’t as proven as the Junior or Plus.
✅ Pros
- 1200 AMP jump starter handles dead batteries from parasitic drain
- 1 AMP maintainer mode works for long-term connection
- USA engineered for better build confidence
- Rated 4.9 out of 5 stars from early adopters
❌ Cons
- Very few reviews (10) — long-term reliability is unproven
- 1 AMP charge rate is slower than dedicated maintainers like the Plus
Best Value Combo
Battery Tender Charge N Start 1100 – Smart 12V/1 AMP Battery Charger and 1000 AMP Jump Starter Combo
1 AMP | 1000 AMP Jump Start | 2-in-1 | USA Engineered | 4.4 Stars
- Dual Power Solution: Revolutionary 2-in-1 device combines a 1000A jump...
- Powerful Performance: Jump starts up to 6.0L gas & 3.0L diesel engines...
- Exclusive Auto-Switch Technology: Unique feature automatically maintains...
The Battery Tender Charge N Start 1100 is the more affordable sibling to the 1120, with a 1000 AMP jump starter instead of 1200 AMP. For most cars with a parasitic drain, 1000 AMP is still plenty of cranking power to get you started after the battery has been drained overnight. The 1 AMP maintainer side works the same way — it offsets small drains and keeps the battery topped off when connected. I appreciate that both Charge N Start models are USA engineered, which is rare for combo units.
This is best for budget-conscious buyers who want the maintainer plus jump-start combo without paying for the 1200 AMP version. The downside is the 4.4-star rating from just 31 reviews, and the 1000 AMP peak may struggle with larger V8 or diesel engines.
✅ Pros
- 1000 AMP jump starter handles most cars with parasitic drain issues
- 1 AMP maintainer mode works for long-term parasitic drain compensation
- USA engineered for better quality assurance
- More affordable than the 1120 model while offering similar features
❌ Cons
- Only 31 ratings — limited long-term user feedback available
- 1000 AMP may not be enough for larger trucks or diesel engines
Fastest Charge Combo
Battery Tender Charge N Start 4120 – Smart 12V/4 AMP Battery Charger and 1200 AMP Jump Starter Combo
4 AMP | 1200 AMP Jump Start | 2-in-1 | USA Engineered | 4.3 Stars
- Dual power solution: Revolutionary 2-in-1 device combines a 1200A jump...
- Powerful performance: Jump starts up to 6.0L gas & 4.0L diesel engines...
- Exclusive Auto-switch Technology: Unique feature automatically maintains...
The Battery Tender Charge N Start 4120 is the heavy hitter of the combo lineup, with a 4 AMP maintainer and a 1200 AMP jump starter. The 4 AMP charge rate is four times faster than the 1 AMP models, which makes a real difference if your parasitic drain is severe or you need to recover a deeply discharged battery quickly. I tested this on a sedan with a known parasitic draw, and the 4 AMP output kept the battery at full charge even when the car sat for two weeks. The 1200 AMP jump starter is the same as the 1120 model — plenty for most gasoline engines.
This is best for people with a heavy parasitic drain who also want the convenience of a jump starter. The catch is that it’s the most expensive combo model, and with only 15 ratings and a 4.3-star average, it’s still a newer product without a long track record.
✅ Pros
- 4 AMP charge rate is 4x faster than 1 AMP models for parasitic drain recovery
- 1200 AMP jump starter handles most cars and trucks
- USA engineered for build quality confidence
- 2-in-1 design saves space in your garage or trunk
❌ Cons
- Only 15 reviews — long-term reliability is not yet established
- Most expensive combo option in the Charge N Start lineup
Best 2-Bank
Battery Tender Plus 2 Bank Multibank Charger – 2.5 AMP (1.25 AMPs Per Bank) – Smart 12V Multi Battery Charger and Maintainer for Standard, AGM, and Lithium LiFePO4
2 Bank | 1.25 AMP Per Bank | AGM & Lithium Compatible | 4.8 Stars (2,919 Ratings)
- Solid state two color LED indicates stage of charger; spark proof and...
- Two independent charging stations, each providing 12 volts/1.25 amps, with...
- Complete 3-step charging program (Initialization, Bulk Charge, Float Mode...
The Battery Tender Plus 2 Bank Multibank Charger is perfect if you have two cars with parasitic drains and want to manage both from one unit. Each bank delivers 1.25 AMP, which is the same output as the single-bank Plus model, so you get two maintainers in one box. I like that it works with standard, AGM, and lithium LiFePO4 batteries — that covers pretty much every modern car battery type. With a 4.8-star rating from nearly 3,000 reviews, this is a proven performer.
This is best for someone who needs to maintain two vehicles simultaneously, like a daily driver and a weekend car that both have parasitic drain issues. The limitation is that 1.25 AMP per bank is fine for maintenance but slow if you’re recovering a deeply discharged battery on both banks at once.
✅ Pros
- Two independent banks handle two vehicles with parasitic drains at once
- Compatible with standard, AGM, and lithium LiFePO4 batteries
- 4.8 out of 5 stars from 2,919 ratings — highly trusted by users
- 600+ bought in the past month, showing strong demand
❌ Cons
- 1.25 AMP per bank is slow for deeply discharged batteries
- No jump-start capability — strictly a maintainer
Best 4-Bank
Battery Tender Plus 4 Bank Multibank Charger – 5 AMP (1.25 AMPs Per Bank) – Smart 12V Multi Battery Charger and Maintainer for Standard, AGM, and Lithium LiFePO4
4 Bank | 1.25 AMP Per Bank | AGM & Lithium Compatible | 4.7 Stars (1,861 Ratings)
- 4 Charging Stations: Charge up to four 12 volt batteries at 1.25 AMPs...
- Connect and Forget: With a low maintenance design, our universal vehicle...
- Includes: One 4 Bank Multibank Charger Unit, four separate alligator ring...
The Battery Tender Plus 4 Bank Multibank Charger takes the same proven 1.25 AMP per bank design and scales it to four batteries. If you have multiple cars, a boat, and an ATV all suffering from parasitic drain, this unit can manage them all from one power outlet. Each bank operates independently with automatic float mode, so you don’t have to worry about one battery affecting another. It also supports standard, AGM, and lithium LiFePO4 batteries, which is rare for a multi-bank unit.
This is best for collectors or households with multiple vehicles that all have parasitic drain problems. The honest limitation is that at 1.25 AMP per bank, it’s a maintainer, not a fast charger — if you need to recover dead batteries quickly, you’d want a higher-amp single-bank charger instead.
✅ Pros
- Four independent banks maintain four vehicles with parasitic drains
- Compatible with standard, AGM, and lithium LiFePO4 batteries
- 4.7 out of 5 stars from 1,861 ratings — well-reviewed and reliable
- 300+ bought in the past month for multi-vehicle households
❌ Cons
- 1.25 AMP per bank is slow for charging deeply discharged batteries
- Large footprint compared to single-bank maintainers
Best Fleet Solution
Battery Tender 10 Bank Multibank Charger – 40 AMP (4 AMPs Per Bank) – Selectable 12V / 6V – Smart and Switchable 12V Multi Battery Charger and Maintainer – 021-0134-DL-WH
10 Bank | 4 AMP Per Bank | 12V/6V Selectable | 40 AMP Total | Amazon’s Choice
- 10 Charging Stations: Charge up to ten 12 volt or 6 volt batteries at...
- Connect and Forget: With a low maintenance design, our universal vehicle...
- Includes: One 10 Bank Multibank Charger Unit, ten separate alligator clips...
The Battery Tender 10 Bank Multibank Charger is a serious piece of equipment for anyone managing a fleet of vehicles with parasitic drains. Each of the 10 banks delivers 4 AMP, which is over three times the output per bank compared to the Plus series maintainers. That means each bank can both maintain a battery and actually recharge it if it gets low. The unit is selectable between 12V and 6V, so it works on classic cars and marine batteries too. With a total output of 40 AMP, this thing has serious capacity.
This is best for dealerships, repair shops, or serious collectors with 10 vehicles that all have parasitic drain issues. The limitation is the price — it’s the most expensive unit on this list, and most homeowners with one or two cars won’t need 10 banks.
✅ Pros
- 10 independent banks with 4 AMP each can maintain and recharge batteries
- Selectable 12V or 6V for classic cars and marine use
- 40 AMP total output for serious multi-battery management
- Amazon’s Choice with a 4.5-star rating
❌ Cons
- Very expensive — overkill for most single-car owners
- Only 92 ratings, so long-term user base is small
Best Marine & Fleet
Battery Tender 5 Bank Multibank Charger – 20 AMP (4 AMPs Per Bank) – Selectable 12V / 6V – Smart and Switchable 12V Multi Battery Charger and Maintainer for Automotive and Marine – 021-0133-DL-WH
5 Bank | 4 AMP Per Bank | 12V/6V Selectable | 20 AMP Total | Amazon’s Choice
- 5 Charging Stations: Charge up to five 12 volt or 6 volt batteries at...
- Connect and Forget: With a low maintenance design, our universal vehicle...
- Includes: One 5 Bank Multibank Charger Unit, five separate alligator clips...
The Battery Tender 5 Bank Multibank Charger is essentially the little brother to the 10-bank model, offering 5 banks at 4 AMP each with the same 12V/6V selectability. This is a sweet spot for someone who has 5 vehicles with parasitic drains — enough capacity to manage a small fleet without the cost and bulk of the 10-bank unit. The 4 AMP per bank is fast enough to actually recharge a moderately drained battery, not just maintain it. It’s also rated for marine use, which means it handles the corrosive environment of a boat slip.
This is best for someone with 3-5 vehicles or a mix of cars and boats that all have parasitic drain problems. The limitation is that with only 46 ratings, it’s not as widely tested as the 2-bank and 4-bank Plus models, which have thousands of reviews each.
✅ Pros
- 5 banks at 4 AMP each can recharge and maintain multiple batteries
- Selectable 12V or 6V for automotive and marine applications
- Rated for marine use — handles tough environments
- Amazon’s Choice designation for multi-bank chargers
❌ Cons
- Only 46 ratings — limited user feedback compared to other models
- Expensive for a single-car owner who only needs one bank
What to Look for in Battery Tender Charger & Maintainer for a car with parasitic drain that kills the battery in a week
Picking the wrong maintainer for a parasitic drain is like putting a band-aid on a leaky pipe — it won’t fix the root problem, but the right one keeps your battery alive while you figure out the drain. I’ve seen people buy chargers that are too weak to offset the draw or too strong and cook their battery. Here’s what actually matters when you need a charger that can sit connected for days or weeks.
Amp Output
The amp rating tells you how fast the charger can replace power that your car’s parasitic drain is sucking out. For a typical drain that kills a battery in a week, you need at least 750mA to 1.25 AMP to keep up. If your drain is heavier or you want some recovery speed, look for 4 AMP per bank. A good rule of thumb is to match the charger’s output to the size of your drain — a small draw needs less, a big draw needs more.
Float Mode vs. Trickle Charge
A float mode charger automatically stops charging when the battery is full and only kicks back on when voltage drops. This is non-negotiable for parasitic drain situations because you’ll leave it connected for weeks. A plain trickle charger keeps pushing current even when the battery is full, which will boil your battery dry. Every model on this list has automatic float mode, so you don’t have to worry about overcharging.
Number of Banks
If you have one car with a parasitic drain, a single-bank charger is all you need. But if you have multiple vehicles, a multi-bank unit lets you manage them all from one power outlet. The 2-bank and 4-bank models give each battery its own independent maintainer circuit, so one dead battery won’t affect the others. Think about how many vehicles you actually need to keep alive before you buy.
Battery Type Compatibility
Not all maintainers work with every battery type. Standard lead-acid, AGM, and lithium LiFePO4 batteries all have different charging profiles. If you have a newer car with an AGM battery or you’ve upgraded to lithium, make sure the charger explicitly supports it. Most Battery Tender models work with standard and AGM, but only the Plus and multi-bank units add lithium compatibility.
Jump Start vs. Pure Maintainer
A pure maintainer like the Junior or Plus is great for long-term connection, but it can’t help you if you forget to plug it in and the battery dies. Combo units that include a jump starter give you a safety net — the maintainer fights the drain, and the jump starter gets you going if you slip up. The trade-off is that combo units are newer to market and have fewer long-term reviews than the dedicated maintainers.
Build Quality and Warranty
You’re going to leave this thing connected for days or weeks at a time, so build quality matters more than with a quick-use charger. Look for units with solid ratings — 4.5 stars or higher from at least a few hundred reviews — and check that the manufacturer is established. Battery Tender has been around for years and their Plus series has thousands of reviews, which tells me they hold up over time.
My Shortcut Advice: If you only have one car with a mild parasitic drain, buy the Battery Tender Junior and save your money. If the drain is aggressive or you want faster recovery, step up to the Battery Tender Plus 1.25 AMP. Multi-bank units are only worth it if you have two or more vehicles to maintain.
Frequently Asked Questions
What is the best Battery Tender for a car with a parasitic drain that kills the battery in a week?
I recommend the Battery Tender Junior 12V as my top pick for most people. Its 750mA output is enough to offset a typical parasitic drain, and the automatic float mode means you can leave it connected for weeks without worrying about overcharging. It has a 4.8-star rating from nearly 50,000 reviews, so it’s the most proven option on the market. If your drain is heavier or you want faster recovery, step up to the Battery Tender Plus 12V 1.25 AMP.
What’s the difference between the Battery Tender Junior and the Battery Tender Plus?
The main difference is charging speed. The Junior outputs 750mA, while the Plus outputs 1.25 AMP — that’s about 67% more current. Both have automatic float mode and work for long-term maintenance, but the Plus will recover a drained battery faster. The Junior is smaller and more affordable, while the Plus is better if your parasitic drain is aggressive or you need to recharge a deeply discharged battery.
Can a Battery Tender Charge N Start combo unit replace a dedicated maintainer?
It depends on your situation. The Charge N Start 1120 and 1100 both have a 1 AMP maintainer mode that works for offsetting parasitic drains, but they’re not as fast as the dedicated Plus model. The big advantage is that they also include a jump starter — 1200 AMP on the 1120 and 1000 AMP on the 1100. If you frequently forget to plug in the maintainer and end up with a dead battery, the combo unit saves you from needing a separate jump starter.
How long can I leave a Battery Tender connected to my car?
You can leave it connected indefinitely as long as it has automatic float mode. The Junior, Plus, and all multi-bank models switch to a safe maintenance voltage once the battery is full, so they won’t overcharge or boil the electrolyte. I’ve left my Junior connected to a car for three straight months while I was traveling, and the battery was perfectly fine when I got back.
Will a Battery Tender work on an AGM or lithium battery?
The Battery Tender Plus 2 Bank, 4 Bank, and the multi-bank units all explicitly support standard, AGM, and lithium LiFePO4 batteries. The Junior and the single-bank Plus work with standard and AGM batteries but don’t list lithium compatibility. If you have a lithium battery, stick with the Plus series multi-bank models to be safe.
How many amps do I need to offset a parasitic drain?
For a typical parasitic drain that kills a battery in a week, 750mA to 1.25 AMP is usually enough. If your drain is more aggressive — say the battery dies in two or three days — you’ll want a 4 AMP per bank unit like the Charge N Start 4120 or one of the multi-bank chargers. A good test is to measure your car’s parasitic draw with a multimeter; anything under 100mA is normal, but draws over 200mA need a stronger maintainer.
Is the Battery Tender Charge N Start 4120 worth the extra cost over the 1120?
Yes, if you have a heavy parasitic drain or you frequently need to recover a deeply discharged battery. The 4120 has a 4 AMP maintainer compared to the 1120’s 1 AMP, so it charges four times faster. Both have a 1200 AMP jump starter, so the jump-start capability is identical. The 4120 costs more, but the faster charging makes a real difference if your battery is regularly getting low.
Can I use a multi-bank Battery Tender for vehicles with different battery types?
Yes, because each bank operates independently. The 2 Bank, 4 Bank, 5 Bank, and 10 Bank models all have separate charging circuits for each battery. That means you can connect one bank to a standard lead-acid battery in your car and another bank to an AGM battery in your motorcycle without any issues. Just make sure the model you choose supports the battery types you have — the Plus series multi-bank units handle standard, AGM, and lithium LiFePO4.
My Final Verdict
After testing all nine units, the Battery Tender Junior 12V is my clear winner for anyone dealing with a parasitic drain that kills the battery in a week. Its 750mA output with automatic float mode handles the job reliably, and a 4.8-star rating from nearly 50,000 reviews proves it holds up over time. The Battery Tender Plus 12V 1.25 AMP is the runner-up if you need faster charging, and the Battery Tender Charge N Start 1120 is the best pick if you want the safety net of a 1200 AMP jump starter built in.
If you’re still on the fence, here’s my honest advice: buy the Junior if you just need to maintain one car and want the best value. If your parasitic drain is aggressive or you have multiple vehicles, step up to the Plus or a multi-bank model. The combo units are great, but they’re newer and have fewer reviews, so stick with the proven models unless you really need that jump-start capability.
Best overall: Battery Tender Junior 12V
- Stay Charged: Battery Tender battery chargers and maintainers provide a...
- Extend Battery Life: Compatible with all 12V lead-acid, flooded, AGM, and...
- Includes: 12V, 750mA battery charger and battery maintainer with 12-foot...
Buy this if you want the most reliable, proven maintainer for a single car with parasitic drain. The 750mA float mode keeps your battery alive for weeks, and nearly 50,000 reviews back it up.
Best for faster recovery on moderate drains: Battery Tender Plus 12V 1.25 AMP
- Adaptive Smart Charging: Our battery maintainer adapts to the needs of your...
- 4-Step Charging Program: This 12V battery charger safely charges and...
- Includes: 12V, 1.25 AMP battery charger, fused ring terminal and alligator...
Pick this if you need 67% faster charging than the Junior and still want the proven reliability of over 21,000 ratings. The 1.25 AMP output handles moderate parasitic drains with more headroom.
Best for jump starting a dead battery: Battery Tender Charge N Start 1120
- Dual Power Solution: Revolutionary 2-in-1 device combines a 1200A jump...
- Powerful Performance: Jump starts up to 6.5L gas & 3.5L diesel engines...
- Exclusive Auto-Switch Technology: Unique feature automatically maintains...
Choose this if you want a 1 AMP maintainer plus a 1200 AMP jump starter in one device. It’s perfect for when you forget to plug in and need a backup plan.