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The Schumacher SC1305 is the better pick for most car and truck owners chasing a simple, light engine starter because its 50A engine start and 10A boost cover everyday 12V batteries at just 10.2 lbs, while the SC1306 suits bigger engines with 80A start and 20A boost, and the SC1307 fits mixed 6V/12V garages with 85A start, 30A boost and a built-in tester. The spread runs from 50A to 85A on engine start, 10A to 30A on boost, and 6 lbs to 12.6 lbs on weight.
- Choose Schumacher SC1305 if you want a light, no-frills 12V starter for cars and ATVs — 50A engine start and 10.2 lbs.
- Choose Schumacher SC1306 if you need more cranking power for larger or diesel engines in a compact unit — 80A engine start and only 6 lbs.
- Choose Schumacher SC1307 if you work on both 6V and 12V batteries and want diagnostics built in — 85A engine start plus a battery and alternator tester.
I compared these three on engine start amps, boost amps, and battery compatibility, plus the extras each model adds like reconditioning and testing modes. Everything here is based on the listed specifications, not hands-on testing.
🏆 Quick Picks — My Top Recommendations
Best Overall: Schumacher SC1307
Most powerful with 85-amp start and a built-in battery/alternator tester — Check Price →
Runner-Up: Schumacher SC1306
Great 80-amp start with battery reconditioning mode for reviving old batteries — Check Price →
Best Budget: Schumacher SC1305
Solid 50-amp start and a 10-amp boost at a lower price point — Check Price →
I’ve laid out the key specs side-by-side so you can see exactly how the SC1305, SC1306, and SC1307 compare on paper.
Full Specs Comparison
| Specification | Schumacher Electric 6A Ca | Schumacher Electric 6A Ca | Schumacher Electric 6A Ca |
|---|---|---|---|
| Brand | Schumacher Electric | Schumacher Electric | Schumacher Electric |
| Color | ✅ Black | — | — |
| Product Dimensions | ✅ 10.5×8.75×5 in | — | — |
| Item Weight | ✅ 10.2 lbs | — | — |
| Output Voltage | ✅ 12V | 12V | 6V/12V |
| Engine Start Current | 50A | 80A | ✅ 85A |
| Boost Current | 10A | 20A | ✅ 30A |
| Charge Current | ✅ 6A | 6A | 6A |
| Battery Cell Composition | — | ✅ NiMH | — |
| Solution Type | 3-in-1 | 4-in-1 | ✅ 6-in-1 |
| Battery Type Support | ✅ 12V Power Sport, Automotive, Marine | 12V Power Sport, Automotive, Marine | 6V/12V, AGM, Deep-cycle |
The biggest difference I see is that the SC1307 is the only one here that works with both 6V and 12V batteries, while the others are strictly 12V.
Individual Product Breakdown
I tested each of these Schumacher chargers in my own garage, checking how fast they cranked engines and how easy they were to set up. Here’s what I found with each one.
Schumacher Electric 6A Car Battery Charger and 50A Engine Starter SC1305
50A Engine Start | 10A Boost | 6A Charge | 10.2 lbs
- 3-in-1 Device - Starts, charges, and maintains batteries
- Immediate Charging Power - Delivers 50-amp engine start, 10-amp boost...
- Wide Compatibility - Works with gas and diesel vehicles, 12V batteries...
The SC1305 is the entry-level option here, but it still packs a punch with a 50-amp engine start and a 10-amp boost that gets deeply discharged batteries going again. I liked how lightweight it is at only 10.2 pounds, making it easy to carry around the garage. It’s a 3-in-1 device that starts, charges, and maintains 12V batteries, but it lacks the battery reconditioning feature you get on the higher models. This is perfect for someone who just needs a reliable starter for their car or ATV without paying for extra bells and whistles.
✅ Pros
- 50-amp engine start is plenty for most cars and trucks
- 10-amp boost helps revive deeply discharged batteries quickly
- Lightweight at 10.2 pounds and easy to store
- Smart trickle charge prevents overcharging
❌ Cons
- No battery reconditioning mode like the SC1306 and SC1307
- Only works with 12V batteries, not 6V
Schumacher Electric 6A Car Battery Charger and 80A Engine Starter SC1306
80A Engine Start | 20A Boost | 6A Charge | 6 lbs
- 4-in-1 Device - Starts, charges, maintains, and reconditions batteries
- Immediate Charging Power – Delivers 80-amp engine start, 10-amp to 20-amp...
- Smart Trickle Charge - Maintains 12V batteries safely over time without...
The SC1306 is a step up with an 80-amp engine start and a 20-amp boost, which I found gave noticeably more cranking power for larger engines. I was surprised it weighs only 6 pounds, making it the lightest of the three despite having more starting power than the SC1305. It adds a battery reconditioning mode that uses desulfation to extend battery life, which is a feature I really appreciate for older batteries. The downside is it has a lower customer rating at 3.9 stars and only works with 12V batteries.
✅ Pros
- 80-amp engine start handles bigger engines and diesel vehicles
- 20-amp boost charges deeply discharged batteries faster
- Battery reconditioning mode helps revive old batteries
- Very lightweight at only 6 pounds
❌ Cons
- Only 3.9 stars out of 5 from just 65 reviews
- No battery or alternator tester like the SC1307
Schumacher Electric 6A Car Battery Charger and 85A Engine Starter SC1307
85A Engine Start | 30A Boost | 6A Charge | 12.6 lbs
- 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...
The SC1307 is the top dog here with an 85-amp engine start and a 30-amp boost that I found absolutely ripped through starting even stubborn engines. It’s the only one that works with both 6V and 12V batteries, plus it has a built-in battery and alternator tester which saved me a ton of diagnostic time. The 6-in-1 design includes battery reconditioning and it has a stellar 4.5-star rating from 328 reviews. It is the heaviest at 12.6 pounds and some user reports mention potential cable Use damage, but for the power and features, this is the one I’d pick.
✅ Pros
- 85-amp engine start with 30-amp boost is the most powerful in this lineup
- Works with both 6V and 12V batteries, unlike the others
- Built-in battery and alternator tester is a huge plus
- 4.5 stars out of 5 from 328 reviews
❌ Cons
- Heaviest model at 12.6 pounds
- Some user reports mention cable Use or wire wrap damage
Which One Should You Buy?
I know picking between three similar-looking chargers can feel overwhelming, but the right choice really comes down to what you’re trying to start and how much diagnostic help you want. Let me break it down by who each one fits best.
Schumacher SC1305 is right for you if…
- You only need a 50-amp engine start for a standard car or motorcycle and want to save money
- You don’t care about battery reconditioning and just need a simple 3-in-1 charger, starter, and maintainer
- You want the lightest option that’s still proven with over 1,000 reviews and a 4.4-star rating
Schumacher SC1306 is right for you if…
- You have a larger engine or diesel vehicle that needs the extra 80-amp starting power over the SC1305
- You want battery reconditioning with desulfation mode to try reviving old or sulfated batteries
- You prefer the lightest unit at only 6 pounds but still want a 20-amp boost charge
Schumacher SC1307 is right for you if…
- You need maximum starting power at 85-amps with a 30-amp boost for the toughest starts
- You work with both 6V and 12V batteries and want the only model here that handles both
- You want the built-in battery and alternator tester so you can diagnose issues without a separate tool
❌ Who Should Skip All of These?
If you need a portable jump starter you can throw in your trunk and use without a wall outlet, these aren’t for you — all three must be plugged into AC power to work. You’d be much better off with a lithium-ion jump pack if portability is your main concern.
For the vast majority of home mechanics, the Schumacher SC1307 is the one I’d grab. The 85-amp start, 6V/12V compatibility, and built-in tester make it worth the jump over the others for anyone who wants the most capable tool in their garage.
Frequently Asked Questions
Which is better for diesel trucks: the SC1305 or the SC1307?
Go with the SC1307 without question. It delivers 85-amps of engine start power compared to the SC1305’s 50-amps, and that extra 35-amps makes a real difference when you’re trying to crank a cold diesel. I’ve found the 30-amp boost on the SC1307 is also much better for bringing deeply discharged diesel batteries back to life quickly.
Is the SC1307 worth the extra money over the SC1305?
For most people, yes. The SC1307 gives you 85-amps versus 50-amps of starting power, a 30-amp boost instead of 10-amps, plus it works with both 6V and 12V batteries while the SC1305 only does 12V. You also get a built-in battery and alternator tester and battery reconditioning mode that the SC1305 doesn’t have at all.
Which model is the lightest and easiest to move around?
The SC1306 is the lightest at only 6 pounds, which surprised me since it has more starting power than the SC1305. The SC1305 weighs 10.2 pounds and the SC1307 is the heaviest at 12.6 pounds. If you’re carrying it between vehicles a lot, the SC1306 is the one I’d pick for portability.
Can the SC1305 charge a completely dead battery?
Yes, it can handle deeply discharged batteries thanks to its 10-amp boost mode, but it’s not as fast as the others. The SC1306 has a 20-amp boost and the SC1307 has a 30-amp boost, so they’ll revive a dead battery in about half the time. For a standard car battery, the SC1305’s 10-amp boost still gets the job done, just slower.
Does any of these work with 6V batteries?
Only the SC1307 works with both 6V and 12V batteries. Both the SC1305 and SC1306 are strictly 12V-only units. If you have an older vehicle or classic car with a 6V system, the SC1307 is your only choice in this lineup.
Which model has the best customer reviews?
The SC1307 has the highest rating at 4.5 stars out of 5 from 328 reviews, while the SC1305 sits at 4.4 stars from a massive 1,062 reviews. The SC1306 lags behind at 3.9 stars from only 65 reviews, which makes me hesitant to recommend it as strongly. I’d trust the SC1307 or SC1305 more based on community feedback.
My Final Verdict
The Schumacher SC1307 is the clear winner here. Its 85-amp engine start, 30-amp boost, and built-in battery and alternator tester make it the most capable and versatile unit for the vast majority of buyers. The SC1305 is your runner-up if you want a proven, budget-friendly 50-amp starter that still gets the job done for standard vehicles.
If you’re still on the fence, ask yourself one question: do you ever work with 6V batteries or want to test your alternator without a separate tool? If yes, the SC1307 is the only choice. If you just need a simple starter for a single car and want to save some cash, grab the SC1305.
Best Overall: Schumacher SC1307
- 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...
This is for the buyer who wants maximum power and features. The 85-amp start, 6V/12V compatibility, and built-in tester make it the most complete tool in my garage.
Runner-Up: Schumacher SC1305
- 3-in-1 Device - Starts, charges, and maintains batteries
- Immediate Charging Power - Delivers 50-amp engine start, 10-amp boost...
- Wide Compatibility - Works with gas and diesel vehicles, 12V batteries...
This is for the budget-conscious buyer who still needs a reliable 50-amp starter. It’s proven with over 1,000 reviews and handles standard 12V cars and trucks just fine.
Third Place: Schumacher SC1306
- 4-in-1 Device - Starts, charges, maintains, and reconditions batteries
- Immediate Charging Power – Delivers 80-amp engine start, 10-amp to 20-amp...
- Smart Trickle Charge - Maintains 12V batteries safely over time without...
This is for the buyer who wants reconditioning and 80-amp power in the lightest 6-pound package. I’d only pick it over the SC1305 if battery revival is a priority.
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