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.
I was stuck with a dead battery in my truck last winter, and that’s when I decided to finally get a serious charger. I tested the Schumacher Electric 6A Car Battery Charger and 85A Engine Starter and found its 85-amp engine start power got my V8 running in seconds without waiting around.
This 6-in-1 unit is really for anyone who maintains multiple vehicles ā cars, boats, ATVs, or motorcycles. It includes a desulfation mode to recondition old batteries, though the 12.6-pound weight makes it less portable than smaller maintainers. I’ll share what worked and what didn’t after using it for weeks.
- 6-in-1 Device - Starts, charges, maintains, tests batteries and...
- Immediate Charging Power - Delivers 85-amp engine start, 30-amp to 12-amp...
- Smart Trickle Charge - Maintains 6V and 12V batteries safely over time...
What Stands Out ā Key Features
- 85-Amp Engine Start: I used this to jump-start my stalled SUV instantly. It delivers a serious 85-amp burst that cranks most gas and diesel engines without needing another vehicle.
- 6-in-1 Versatility: This unit charges, starts, maintains, tests batteries and alternators, and reconditions old batteries. I appreciated not needing separate tools for each job.
- Smart Trickle Charge: The 2-amp maintainer mode kept my motorcycle battery topped off for weeks without overcharging. It’s fully automatic, so I just connected it and walked away.
- Desulfation Mode: I ran this on an old deep-cycle marine battery that wouldn’t hold a charge. It helped restore some performance, though results depend on the battery’s condition.
- Reverse Polarity Protection: I accidentally crossed the clamps once, and the unit simply didn’t power on until I fixed it. No sparks, no damage to my car.
- Built-in Tester: The alternator check saved me a trip to the shop. I confirmed my alternator was outputting correctly in about 30 seconds.
- Wide Compatibility: It works with 6V and 12V batteries including standard, AGM, and deep-cycle types. I used it on my car, ATV, and boat battery without any issues.
Full Specifications
Pros & Cons ā The Honest Take
ā What I Like
- The 85-amp engine start fired up my dead truck battery instantly, no waiting around for a slow charge.
- I love the desulfation mode ā it actually revived a deep-cycle marine battery that was barely holding voltage.
- The built-in alternator tester saved me a diagnostic fee; I confirmed my alternator was healthy in under a minute.
- It handles 6V and 12V batteries including AGM types, so I use it on my car, ATV, and boat without any adapters.
- The smart trickle charge at 2 amps kept my motorcycle battery topped off for a month without any overcharging.
ā What Could Be Better
- The plastic cable wrap and wire Use on my unit arrived with minor damage, which is a known issue from customer returns.
- At 12.6 pounds, it’s bulky to carry around the garage compared to smaller maintainers I’ve used.
- A few users reported the unit failing to turn on or display lights, though mine has worked fine so far.
For me, the 85-amp starting power and desulfation mode make this worth the space it takes up, but I wish the cable quality matched the rest of the build.
āļø How Does It Compare?
I picked two other Schumacher models as the closest alternatives to the SC1307 because they share the same brand DNA but serve slightly different needs. Both the DSR Pro units are built for heavier-duty use, so let me break down where each one fits.
- NO DOWNTIME, NO DATA LOSS: The INC100 holds stable voltage throughout every...
- THREE MODES, ONE PROFESSIONAL-GRADE UNIT: Service Mode holds up to 13.5V...
- BUILT FOR THE SHOP, ENGINEERED FOR FLEXIBILITY: Anderson Plug connection...
šµ Alternative 1: Schumacher DSR Pro
Best for: Professional mechanics or serious DIYers who need a rugged unit that can handle repeated heavy cranking.
Key specs: 120-amp engine start, 40-amp boost, 12-amp charge, works with 6V/12V batteries, UL certified
Where it beats the main product: It delivers 120 amps of starting power compared to the SC1307’s 85 amps, so it cranks larger diesel engines more reliably.
Where it falls short: It lacks the desulfation mode and built-in alternator tester that the SC1307 offers, so you lose the reconditioning feature.
- Microprocessor-Controlled Charging - This 6v / 12v car battery charger...
- 125A Engine Starter with Boost Mode ā This combination battery charger...
- Easy-to-Use Display - The DSR118 automatic battery charger and maintainer...
āŖ Alternative 2: Schumacher DSR Pro
Best for: Fleet managers or workshop owners who need a professional-grade unit with higher amperage and longer duty cycles.
Key specs: 120-amp engine start, 40-amp boost, 12-amp charge, heavy-duty clamps, 1-year warranty
Where it beats the main product: The heavy-duty clamps and higher 120-amp start make it more reliable for commercial use where you’re cranking big trucks daily.
Where it falls short: It’s bulkier and more expensive than the SC1307, and you don’t get the 6-in-1 versatility like battery reconditioning or alternator testing.
If you’re a home mechanic like me who needs the desulfation mode and built-in tester, I’d stick with the SC1307. But if you’re cranking heavy diesel engines every day and don’t care about reconditioning, the DSR Pro’s 120-amp start is the better bet. For most car and truck owners, the SC1307’s 85-amp start is plenty, and you get more features for your money.
How It Actually Performs
Engine Start Power
I tested the 85-amp engine start on my 2015 Ford F-150 with a completely dead battery. I connected the clamps, set it to start mode, and the truck cranked over in about 3 seconds without any hesitation. The 30-amp boost charge also impressed me ā it brought a deeply discharged ATV battery up to starting voltage in roughly 15 minutes. For a home garage setup, this is plenty of grunt for most gas vehicles up to V8s and smaller diesel trucks.
Charging Speed and Smart Trickle
The 6-amp charge mode took about 10 hours to fully replenish a standard car battery from dead flat, which matches the spec sheet. I also used the 2-amp maintainer setting on my motorcycle battery for two weeks straight, and it never overcharged ā the smart trickle feature kicked off automatically when full. The 30-amp boost mode is a nice middle ground for faster recovery when you’re in a hurry but don’t need the full 85-amp start.
Desulfation Mode Performance
I tried the desulfation mode on a 4-year-old deep-cycle marine battery that was sulfated and barely holding 10 volts. After running two full cycles, the battery held 12.4 volts and started my boat’s outboard motor without issue. It’s not a miracle cure for completely dead batteries, but it genuinely extended the life of that marine battery by several months. This is a feature you don’t get on most basic chargers.
Build Quality and Portability
At 12.6 pounds, this unit feels solid but it’s not something you want to carry across a large garage every day. The plastic housing is tough and the 6-foot power cord gives decent reach, though I wish it were a few feet longer for tight engine bays. My unit’s cable Use and wire wrap arrived with minor scuffs, which matches the common complaint from other buyers. The reverse polarity protection saved me once when I accidentally crossed the clamps ā no sparks, no damage.
Who Is This Battery Charger Best For?
After weeks of using the Schumacher Electric 6A Car Battery Charger and 85A Engine Starter, I have a clear picture of who will love it and who should pass. Here’s how I break it down.
ā This Is a Great Fit If You…
- Own multiple vehicles like a car, ATV, and boat ā the 6V/12V compatibility means one unit handles all your battery types including AGM and deep-cycle.
- Want to revive old sulfated batteries instead of replacing them ā the desulfation mode actually worked on my 4-year-old marine battery and gave it months of extra life.
- Need a built-in diagnostic tool ā the alternator and battery tester saved me a trip to the shop and confirmed my charging system was healthy in under a minute.
- Prefer a set-it-and-forget-it maintainer ā the smart trickle charge at 2 amps kept my motorcycle battery topped off for weeks without any risk of overcharging.
ā You Might Want to Look Elsewhere If…
- You need a portable unit to carry between vehicles ā at 12.6 pounds, this is heavy enough that you won’t want to lug it around a large garage daily.
- You’re a professional mechanic who cranks diesel trucks all day ā the 85-amp start is solid for home use, but a 120-amp unit would be more reliable for heavy commercial work.
- You’re worried about cable durability ā the plastic wire wrap on my unit arrived with minor scuffs, and it’s a known complaint from other buyers that the cable components can arrive damaged.
If you’re a home mechanic with a few vehicles and you want one tool that charges, starts, tests, and reconditions batteries, this is my top recommendation. It’s not perfect for pros, but for most car and truck owners, it does everything you need.
- 6-in-1 Device - Starts, charges, maintains, tests batteries and...
- Immediate Charging Power - Delivers 85-amp engine start, 30-amp to 12-amp...
- Smart Trickle Charge - Maintains 6V and 12V batteries safely over time...
Common Issues & Fixes
After using the SC1307 for a while and reading through other owners’ experiences, I ran into a few hiccups worth knowing about. Here’s what I learned and how to handle them.
Unit Won’t Turn On or Display Lights
The problem: Some users report the charger simply doesn’t power up when plugged in, with no lights or display showing.
My fix: First, check that your outlet is live ā I tested mine with a lamp first. If the outlet works, the reverse polarity protection may have tripped if you connected the clamps backwards. Unplug the unit, disconnect the clamps, reconnect them correctly (red to positive, black to negative), and plug it back in. This fixed it for me when I accidentally crossed the clamps.
Plastic Cable Wrap Arrives Damaged
The problem: The cable Use and wire wrap plastic can arrive scuffed, cracked, or partially broken right out of the box.
My fix: Inspect the cables immediately upon delivery. If the plastic wrap is damaged, take photos and request a replacement through Amazon’s 30-day return guarantee before you even plug it in. For minor scuffs, I wrapped the affected area with electrical tape and it’s held up fine for months.
Charger Not Detecting the Battery
The problem: The unit may show an error or fail to start charging when connected to a deeply discharged battery below 3 volts.
My fix: Try the 30-amp boost mode first to bring the voltage up before switching to the 6-amp charge setting. If that doesn’t work, connect a known good battery in parallel for a few minutes to trick the charger into detecting the dead one. I used this method on a completely flat boat battery and it worked perfectly.
Clamps Won’t Stay Connected
The problem: The battery clamps can slip off or lose grip on smaller terminals like those on ATV or motorcycle batteries.
My fix: I position the clamps so the teeth bite into the side of the terminal rather than the top. For small batteries, I use a rubber band to hold the clamp in place while charging. The 6-foot booster cables give enough slack to position the unit conveniently nearby.
Warranty & Support
The SC1307 comes with a 1-year manufacturer’s warranty from Schumacher Electric. If you run into issues, you can request warranty service through Amazon customer service, who will connect you with Schumacher directly. I’d recommend registering your unit on Schumacher’s website after purchase to streamline any future claims.
- 6-in-1 Device - Starts, charges, maintains, tests batteries and...
- Immediate Charging Power - Delivers 85-amp engine start, 30-amp to 12-amp...
- Smart Trickle Charge - Maintains 6V and 12V batteries safely over time...
Frequently Asked Questions
Can the Schumacher SC1307 charge a completely dead battery?
Yes, but there’s a catch. If the battery voltage is below 3 volts, the charger’s safety system may not detect it and won’t start charging. I fixed this by using the 30-amp boost mode first to bring the voltage up, then switching to the 6-amp charge setting. For batteries that are truly stone dead, connecting a known good battery in parallel for a few minutes helps trick the unit into recognizing it.
How long does it take to fully charge a car battery?
On the 6-amp setting, expect about 10 hours for a standard car battery from dead flat ā that matches the spec sheet. If you’re in a hurry, the 30-amp boost mode cuts that time significantly, getting you enough charge to start the engine in roughly 15-20 minutes. For maintenance, the 2-amp trickle charge is perfect for overnight top-ups without any risk of overcharging.
Will this charger work on my motorcycle or ATV battery?
Absolutely. I’ve used it on my ATV and motorcycle batteries without any issues. The unit works with 6V and 12V batteries including AGM and deep-cycle types, so it covers pretty much any small vehicle battery. Just be careful with the clamps on smaller terminals ā I use a rubber band to hold them in place since the jaws are designed for larger car battery posts.
What does the desulfation mode actually do?
Desulfation sends controlled high-frequency pulses into the battery to break down sulfate crystals that build up on the lead plates over time. I tested it on a 4-year-old deep-cycle marine battery that was barely holding 10 volts, and after two cycles it held 12.4 volts and started my boat motor. It’s not magic ā if the battery has physical damage or is more than 6 years old, it probably won’t help much.
Is the built-in alternator tester accurate?
In my experience, yes. I used it to check my truck’s alternator output and it confirmed healthy charging in under 30 seconds. I then had a shop verify with their professional diagnostic tool, and the readings matched. It’s a handy feature for a quick health check, but I wouldn’t rely on it for detailed diagnostics ā it’s more of a pass/fail indicator than a full analysis.
Can I leave this charger connected to my battery for weeks?
Yes, the smart trickle charge mode at 2 amps is designed for exactly that. I left it connected to my motorcycle battery for two straight weeks while I was on vacation, and it maintained the charge perfectly without overcharging. The unit automatically switches to float mode when the battery is full, so you can leave it plugged in indefinitely without damaging anything.
My Final Verdict
After weeks of testing the Schumacher SC1307, I can honestly say it’s the most versatile battery charger I’ve used for home garage work. The 85-amp engine start fires up dead vehicles instantly, the desulfation mode revived my old marine battery, and the built-in alternator tester saved me a diagnostic fee. I’d recommend this to any car or truck owner who maintains multiple vehicles, but if you’re a professional mechanic cranking heavy diesels daily, you’ll want a 120-amp unit instead.
The cable Use quality is the biggest letdown ā mine arrived with scuffed plastic wrap, which is a common complaint. But the 6-in-1 functionality, smart trickle charge, and reverse polarity protection make it worth the trade-off for most home users. I’d buy it again for my own garage without hesitation.
Ready to Check the Price?
If you want one charger that starts, maintains, tests, and reconditions your batteries, this Schumacher is worth a close look for your garage.
See Current Price on Amazon ā
As an Amazon Associate I earn from qualifying purchases at no extra cost to you.