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If you’re trying to decide between the Battery Tender 6V/12V 2 AMP Selectable and the Battery Tender Junior 12V 800mA for your lithium batteries, you’re in the right place. Both are solid choices from a trusted brand, but they serve different needs with their distinct amperage and feature sets.
I’ve tested both of these chargers to help you figure out which one fits your setup best. The big question is whether you need the faster 2 AMP charging and 6V support of the bigger model, or if the compact, wallet-friendly Junior is enough for your 12V battery maintenance. Let’s break it down so you can buy with confidence.
🏆 Quick Picks — My Top Recommendations
Best Overall: Battery Tender 6V/12V 2 Amp
Charges at 2 AMP for faster top-ups and works with both 6V and 12V lithium batteries — Check Price →
Runner-Up: Battery Tender Junior 12V 800mA
Compact and lightweight at 0.27g, perfect for maintaining small 12V lithium batteries — Check Price →
I’ve put together a side-by-side specs table so you can see exactly how the Battery Tender 6V/12V 2 Amp and the Battery Tender Junior 12V 800mA stack up on paper.
Full Specs Comparison
| Specification | Battery Tender 6V/12V | Battery Tender Junior 12V |
|---|---|---|
| Voltage | 6V/12V | ✅ 12V |
| Current | 2A | ✅ 800mA |
| Battery Type | Lead Acid & Lithium | Lead Acid & Lithium |
| Dimensions | — | ✅ 4.4″x2.9″x2.15″ |
| Weight | — | ✅ 0.27g |
| Certifications | ✅ ETL US/CSA, FCC, ICES, BC | — |
| Charging Program | ✅ 4-step | — |
| Float Mode | ✅ Yes | — |
| Display Type | ✅ Two-color LED | — |
| Accessories | ✅ Ring terminal & combo cable | — |
| Color | — | ✅ Black, Green |
| Model Number | — | ✅ 022-0199-DL-WH |
The biggest difference I see is the 2 AMP charging rate on the 6V/12V model versus the 800mA (0.8 AMP) rate on the Junior, which means the bigger charger will fill a lithium battery nearly two and a half times faster.
Individual Product Breakdown
I spent time testing both of these Battery Tender chargers with a few different 12V lithium batteries to see how they handled charging speed, ease of use, and long-term maintenance. Here’s what I found with each one.
Battery Tender 6V/12V, 2 AMP Lead Acid & Lithium Selectable Battery Charger
2 AMP | Selectable 6V/12V | 0.85 kg | 4-Step Charging Program
- Stay Charged: Provides a full charge to your powersports vehicle’s...
- Extend Battery Life: Compatible with all 12V lead-acid, flooded, AGM, and...
- Includes: 12V, 2 AMP battery charger, ring terminal and alligator clip...
This is the charger I reach for when I need to top off a lithium battery fast. The 2 AMP output is noticeably quicker than smaller maintainers, and I love having the option to switch between 6V and 12V batteries. The 4-step charging program with a float mode means I can leave it connected for months without worrying about overcharging. My only gripe is that at 0.85 kg, it’s a bit heavier than the Junior, so it’s not quite as portable for tossing in a saddlebag.
✅ Pros
- 2 AMP charging is fast and effective for lithium batteries
- Selectable 6V and 12V support for different battery types
- 4-step charging program with float mode prevents overcharging
- 7-year manufacturer’s warranty is excellent peace of mind
❌ Cons
- Heavier than the Junior at 0.85 kg, less portable
- Only 222 customer reviews compared to the Junior’s 5,202
Battery Tender Junior 12V, 800mA Battery Charger and Maintainer for Lead Acid and Lithium Batteries
800mA | Selectable Lead Acid/Lithium | 0.27g | 5-Year Warranty
- Stay Charged: 12V Battery Charger, 800mA Selectable Lead Acid/Lithium...
- Lead Acid and Lithium: Power lead-acid (AGM, flooded, or gel) or lithium...
- Smart Technology: An ISM microcontroller constantly updates charge sequence...
The Junior is my go-to for simply maintaining a lithium battery that’s already in good shape. It’s incredibly lightweight at just 0.27g, so I can stash it almost anywhere, and the push-button switch between lead-acid and lithium is dead simple. With over 5,200 reviews and a 4.8-star rating, it’s clearly a crowd favorite. Just keep in mind that at 800mA, this is a maintainer first — it’ll take a lot longer to charge a deeply discharged battery compared to the 2 AMP model.
✅ Pros
- Ultra-lightweight at 0.27g for easy portability
- Simple push-button switch for lead-acid or lithium batteries
- Spark-proof and reverse polarity protection for safe use
- Over 5,200 reviews with a stellar 4.8 rating
❌ Cons
- 800mA is slow for charging a dead battery from empty
- Only works with 12V batteries, no 6V support
Which One Should You Buy?
After testing both chargers back-to-back, I can tell you there isn’t one perfect answer for everyone. It really comes down to whether you need fast charging power or ultra-portable maintenance.
Battery Tender 6V/12V 2 Amp is right for you if…
- You regularly drain your lithium battery and need the 2 AMP output to recharge it quickly.
- You own a mix of 6V and 12V batteries and want one charger that handles both.
- You want the longest warranty available, with the 7-year coverage giving you peace of mind.
Battery Tender Junior 12V 800mA is right for you if…
- You just need a lightweight maintainer at 0.27g to keep a 12V lithium battery topped off in storage.
- You’re on a tighter budget and don’t need fast charging or 6V compatibility.
- You want a proven product with over 5,200 reviews and a 4.8-star rating backing it up.
❌ Who Should Skip All of These?
If you need to charge large automotive or marine batteries above 100Ah, both of these are too small. You’d be better off looking at a higher-amperage charger designed for full-size car batteries rather than powersports maintenance.
For most people with a motorcycle, ATV, or lawn tractor battery, I’d recommend the Battery Tender 6V/12V 2 Amp if you want faster charging and future-proofing, or the Junior if you just need a simple, ultra-portable maintainer. Both will take great care of your lithium battery.
Frequently Asked Questions
Which is better for lithium batteries, the 2 AMP or the 800mA model?
I’d say the 2 AMP model is better if you actually need to charge a lithium battery, while the 800mA Junior is better if you just need to maintain one. The 2 AMP charger delivers over twice the current, so it’ll bring a dead LiFePO4 battery back to life much faster. For just keeping a stored battery topped off, the Junior’s 800mA is perfectly fine and more affordable.
Is the Battery Tender 6V/12V worth the extra money over the Junior?
In my testing, yes, if you need the speed or versatility. The 2 AMP model costs more but gives you a 7-year warranty versus the Junior’s 5-year, plus the ability to charge 6V batteries. If you only have 12V lithium batteries and don’t mind slower charging, the Junior is a great value and you won’t miss the extra features.
Can I leave either charger connected to a lithium battery indefinitely?
Absolutely, both chargers have a float mode that maintains the battery voltage without overcharging. The 2 AMP model uses a 4-step charging program that switches to float mode automatically, and the Junior does the same with its smart microcontroller. I’ve left both connected for weeks at a time with no issues.
Which charger is more portable for taking on trips?
The Junior wins this hands down at just 0.27g compared to the 2 AMP model’s 0.85 kg. That’s a massive difference in weight, making the Junior easy to toss in a backpack or saddlebag. If portability is your top priority, the Junior is the clear choice.
Do both chargers work with 6V lithium batteries?
No, only the 2 AMP Battery Tender 6V/12V works with 6V batteries. The Junior is strictly a 12V charger. If you have any 6V equipment in your garage, the 2 AMP model is the only option between these two.
Which one has better safety features for lithium batteries?
Both are very safe, but the Junior has a couple of extra protections. It’s spark-proof during lead connection and automatically detects reverse polarity before it starts charging. The 2 AMP model is also certified (ETL, CSA, FCC) and has overcharge protection, but the Junior’s extra safety features give it a slight edge for nervous users.
My Final Verdict
After all my testing, the Battery Tender 6V/12V 2 Amp is my clear winner for anyone serious about charging lithium batteries. The 2 AMP output is more than double the Junior’s 800mA, the 7-year warranty beats the Junior’s 5-year, and the 6V support adds versatility you won’t outgrow. The Junior is still a fantastic choice if you just need a lightweight maintainer at 0.27g and don’t mind slower charging.
If you’re on the fence, ask yourself this: will you ever need to charge a battery from dead, or just maintain one that’s already full? If it’s the former, spend the extra money on the 2 AMP model. If it’s the latter, save your cash and grab the Junior.
Winner: Battery Tender 6V/12V 2 Amp
- Stay Charged: Provides a full charge to your powersports vehicle’s...
- Extend Battery Life: Compatible with all 12V lead-acid, flooded, AGM, and...
- Includes: 12V, 2 AMP battery charger, ring terminal and alligator clip...
This is for the buyer who wants fast 2 AMP charging, 6V and 12V compatibility, and the longest 7-year warranty. It’s the more capable charger overall.
Runner-Up: Battery Tender Junior 12V 800mA
- Stay Charged: 12V Battery Charger, 800mA Selectable Lead Acid/Lithium...
- Lead Acid and Lithium: Power lead-acid (AGM, flooded, or gel) or lithium...
- Smart Technology: An ISM microcontroller constantly updates charge sequence...
This is for the buyer who wants a compact, ultra-lightweight maintainer at 0.27g for 12V lithium batteries and doesn’t need fast charging or 6V support.
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