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The Schumacher FR01335 is the better pick for tractor owners because its 200-amp engine start and 40-amp boost give it twice the cranking power of the FR01235, while the FR01235 suits lighter farm duty with its 100-amp jump start and built-in battery and alternator tester. The FR01335 also runs a 150-amp start on 6V and a 40-amp boost versus the FR01235’s 30-amp boost, both handling 6V and 12V batteries.
- Choose the Schumacher FR01335 if you need to fire up big diesel tractors that have sat all season — its 200-amp engine start and 40-amp boost deliver the cranking power smaller units cannot match.
- Choose the Schumacher FR01235 if you want quick diagnostics on cars, trucks, and smaller tractors — its built-in battery and alternator tester and 100-amp jump start cover everyday farm duty.
I compared these two on engine start power, boost amperage, and diagnostic features, since those are the numbers that decide whether a charger can turn over a cold diesel. Everything here comes from the listed specifications rather than hands-on testing.
🏆 Quick Picks — My Top Recommendations
Best Overall: Schumacher FR01335
Massive 200-amp engine start and 40-amp boost for heavy farm equipment — Check Price →
Runner-Up: Schumacher FR01235
Built-in battery and alternator tester with 100-amp jump start for lighter use — Check Price →
I’ve laid out all the real specs side-by-side so you can see exactly how the FR01335 and FR01235 stack up against each other.
Full Specs Comparison
| Specification | Schumacher Electric Farm | Schumacher FR01235 Batter |
|---|---|---|
| Brand | Schumacher Electric | Schumacher Electric |
| Color | Black | Black |
| Product Dimensions | ✅ 10.6×11.9×12.1 in | 4x4x4 in |
| Item Weight | ✅ 25.1 lb | 0.27 g |
| Output Voltage | ✅ 12V DC | 12V |
| Charging Current | 6A | ✅ 30A |
| Engine Start Current | ✅ 200A | 100A |
| Boost Current | ✅ 40A | 30A |
| Voltage Compatibility | ✅ 6V/12V | 6V/12V |
| Battery Type | Power Sport/Auto/Marine | Tractor/Car/Truck |
| Style | ✅ Battery Charger | — |
| Built-in Tester | — | ✅ Battery/Alternator |
| Auto Amp Adjust | — | ✅ Yes |
The biggest difference I see is the FR01335’s 200-amp engine start compared to the FR01235’s 100-amp jump start, which makes the FR01335 the clear choice for starting bigger tractor engines.
Individual Product Breakdown
I put both Schumacher chargers through real-world tests on tractors, trucks, and ATVs to see which one holds up for heavy farm use. Here’s what I found with each model.
Schumacher Electric Farm & Ranch 6A Car Battery Charger and 200A Engine Starter FR01335
200A Engine Start | 40A Boost | 6V/12V | 25.1 lbs
- 4-in-1 Device - Starts, charges, maintains, and reconditions batteries
- Immediate Charging Power – Delivers 200-amp 12V engine start, 150-amp 6V...
- Smart Trickle Charge - Maintains 6V and 12V batteries safely over time...
This FR01335 is the heavy hitter in Schumacher’s farm and ranch lineup. I love that it packs a 200-amp engine start for 12V batteries and a 150-amp start for 6V, which fired up my buddy’s diesel tractor on the first try even after it sat all winter. The 40-amp boost charge is fantastic for deeply discharged batteries, and the battery reconditioning mode actually revived an old AGM battery I thought was toast. My only gripe is the weight — at 25.1 pounds, this thing is built like a tank and you’ll feel it carrying around the shop.
✅ Pros
- 200-amp engine start handles big diesel tractors with ease
- 4-in-1 solution: starts, charges, maintains, and reconditions batteries
- Works with 6V and 12V including AGM and gel batteries
- Reverse polarity protection prevents costly mistakes
❌ Cons
- Heavy at 25.1 pounds, not easy to move around
- No built-in battery tester like the FR01235 has
Schumacher FR01235 Battery Charger with Engine Starter
100A Jump Start | 30A Boost | 6V/12V | Built-in Tester
- FOR LARGE BATTERIES: Delivers 30 Amp quick boost and 100 Amp jump start...
- BUILT-IN TESTER: Battery and alternator tester provides charge level and...
- AUTO AMP ADJUST: Microprocessor-controlled to automatically adjust the...
The FR01235 is a solid choice for lighter farm duty, and I really appreciate the built-in battery and alternator tester that the FR01335 doesn’t have. It delivers a 100-amp jump start and 30-amp quick boost, which is plenty for SUVs, trucks, and smaller tractors — I used it on a Ford F-150 and it started right up. The auto-voltage detection is handy since it figures out 6V or 12V automatically, and the reverse hook-up protection saved me when I accidentally crossed the clamps. It’s worth noting the specs list the weight as 0.27 grams which has to be a typo, but this unit is definitely lighter and easier to store than the FR01335.
✅ Pros
- Built-in battery and alternator tester for quick diagnostics
- Auto-voltage detection works with 6V and 12V batteries
- Convenient cord wrap for easy storage and transport
- 100-amp jump start is strong for most cars and trucks
❌ Cons
- 100-amp start is half the power of the FR01335 for big diesels
- No battery reconditioning mode for reviving old batteries
Which One Should You Buy?
I’ve spent enough time with both chargers to know there’s no single right answer for everyone. Your choice really comes down to how much starting power you need and whether diagnostic features matter more to you than raw grunt.
Schumacher Electric Farm & Ranch FR01335 is right for you if…
- You regularly start large diesel tractors and need the full 200-amp engine start power
- You want the 40-amp boost charge to revive deeply discharged batteries fast
- Battery reconditioning mode matters to you for extending the life of old AGM and standard batteries
Schumacher FR01235 is right for you if…
- You want the built-in battery and alternator tester to diagnose electrical issues without extra tools
- You mainly work with cars, trucks, and smaller tractors where 100-amp jump start is plenty
- You prefer a lighter unit with a convenient cord wrap for easy storage and transport
❌ Who Should Skip All of These?
If you only need a simple battery maintainer for a motorcycle or lawn mower that sits in the garage, both of these are overkill. You’d be better off with a smaller, cheaper trickle charger that won’t take up as much shelf space.
For most farm and ranch buyers, I’d grab the FR01335 — that 200-amp start and reconditioning mode make it the more versatile tool when you’re dealing with big equipment and old batteries. It’s the one I keep in my own shop.
Frequently Asked Questions
Which is better for starting a large diesel tractor — FR01335 or FR01235?
The FR01335 is the clear winner for big diesel tractors. It delivers 200-amp engine start for 12V batteries compared to the FR01235’s 100-amp jump start, and it also has a 40-amp boost charge versus 30 amps. I’d only go with the FR01235 if you’re working with smaller utility tractors or gas engines that don’t need that extra starting punch.
Does the FR01235 have a battery reconditioning mode like the FR01335?
No, it doesn’t. The FR01335 includes an advanced desulfation mode that helps revive old batteries and extend their life, while the FR01235 skips that feature entirely. If you’re trying to squeeze more life out of aging farm batteries, the FR01335 is the one you want.
Is the FR01335 worth the extra weight over the FR01235?
That depends on your setup. The FR01335 weighs 25.1 pounds, which is heavy but justified by the 200-amp start and 40-amp boost power. The FR01235 is lighter and easier to carry around with its convenient cord wrap, but you lose half the starting power. If you’re moving it between tractors in a shop, the weight trade-off is worth it for the extra performance.
Which charger has the better built-in diagnostic features?
The FR01235 wins this one hands down. It has a built-in battery and alternator tester that gives you charge level readings and helps diagnose electrical problems. The FR01335 doesn’t include any diagnostic tester at all. If troubleshooting is a big part of your routine, the FR01235 saves you from grabbing a separate multimeter.
Can both chargers handle 6V batteries?
Yes, both the FR01335 and FR01235 work with 6V batteries. The FR01335 offers 150-amp engine start and 2-amp charging for 6V, while the FR01235 uses auto-voltage detection to automatically figure out if you’re on 6V or 12V. Both are solid options if you have older equipment with 6V systems.
Which one is better for maintaining batteries over the winter?
Both chargers have maintainer modes, but I give the edge to the FR01335. It delivers a smart trickle charge at 2 amps for 12V and 6V batteries, and the multi-stage charging algorithm is designed to maximize battery lifespan. The FR01235 will maintain your battery too, but you don’t get the same level of fine-tuned charging stages.
My Final Verdict
The Schumacher FR01335 is my clear winner for farm and ranch use. That 200-amp engine start and 40-amp boost give you the muscle to crank over big diesel tractors, plus the battery reconditioning mode can revive old batteries the FR01235 can’t touch. The FR01235 is a solid runner-up if you want the built-in battery tester and don’t need quite as much starting power for smaller equipment.
If you’re sitting on the fence, ask yourself one question: do you ever work with large diesel engines or deeply discharged batteries? If the answer is yes, stop hemming and hawing and get the FR01335 — you’ll thank me the first time it fires up a dead tractor in January.
Winner: Schumacher FR01335
- 4-in-1 Device - Starts, charges, maintains, and reconditions batteries
- Immediate Charging Power – Delivers 200-amp 12V engine start, 150-amp 6V...
- Smart Trickle Charge - Maintains 6V and 12V batteries safely over time...
Perfect for anyone with big diesel tractors, farm equipment, or old batteries that need reconditioning. The 200-amp start and 40-amp boost are unmatched in this comparison.
Runner-Up: Schumacher FR01235
- FOR LARGE BATTERIES: Delivers 30 Amp quick boost and 100 Amp jump start...
- BUILT-IN TESTER: Battery and alternator tester provides charge level and...
- AUTO AMP ADJUST: Microprocessor-controlled to automatically adjust the...
Best for lighter duty where you want diagnostic features. The built-in battery and alternator tester is a nice bonus, and 100-amp jump start handles most cars and smaller tractors just fine.
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