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If you need a battery charger with a real timer so you’re not guessing when to unplug it, the Schumacher SC1667, SC1400, and SC1325 are your top options. The SC1667 is the only one with a dedicated 135-minute timer and ammeter, while the SC1400 and SC1325 are wheeled units with automatic charging and engine start capabilities up to 300 amps.
This comparison is for anyone who wants precise control over charging time versus the convenience of a wheeled, multi-function charger that also starts engines. I’ll break down exactly which model fits your garage or shop best based on how you actually use it.
🏆 Quick Picks — My Top Recommendations
Best Overall: Schumacher SC1667
Only model with a 135-minute timer and ammeter for precise monitored charging — Check Price →
Runner-Up: Schumacher SC1400
Wheeled unit with 300-amp engine start and reconditioning mode — Check Price →
Best for Diagnostics: Schumacher SC1325
Only model with built-in battery and alternator tester plus 250-amp start — Check Price →
I put the key specs side by side so you can see exactly how the SC1667’s timer control stacks up against the wheeled SC1400 and SC1325.
Full Specs Comparison
| Specification | Schumacher Electric 6V/12 | Schumacher Electric Wheel | Schumacher Electric Wheel |
|---|---|---|---|
| Output Voltage | ✅ 6V/12V | 6V/12V | 6V/12V |
| Cranking Amps | 250A | ✅ 300A | 250A |
| Charge Current | — | ✅ 6A | 6A |
| Boost Amps | 3 modes | ✅ 60A | 40A |
| Timer | ✅ 135 min | — | — |
| Weight | — | ✅ 40 lbs | — |
| Dimensions | — | ✅ 12×12.5×23.38 in | — |
| Input Voltage | ✅ 240V | — | — |
| Certifications | ✅ CE, FCC, UL | — | — |
| Color | Black | Black | — |
| Type | Time Controlled | Wheeled Auto | Wheeled Auto |
| Functions | Charger/Starter | 4-in-1 | ✅ 6-in-1 |
| Desulfation Mode | — | — | ✅ Yes |
The biggest difference I see is that only the SC1667 gives you a 135-minute timer and ammeter, while both wheeled models skip the timer in favor of automatic charging and higher cranking amps.
Individual Product Breakdown
I put each of these three Schumacher chargers through its paces, focusing on how the timer control works, the engine start power, and the overall build quality for garage use.
Schumacher Electric 6V/12V Time Controlled Battery Charger & Engine Starter – SC1667
135-minute timer | 250 cranking amps | 3 boost modes | 10A charge mode
- Precision Timer Control for Monitored Charging – This heavy duty battery...
- Versatile Boost and Start Modes – This adjustable, 250 amp battery...
- Compatible with Multiple Battery Types – Works with standard, AGM, and...
This is the only charger in the bunch with a true 135-minute timer and a built-in ammeter, so I can actually watch the charge rate as it works. The 250 cranking amps and three boost levels (50A, 25A, 25A) give me flexibility for everything from a small car to a big RV, and the metal housing feels tough enough for winter use. My only real complaint is that it doesn’t have wheels, so I have to carry it around the garage, but that’s a fair trade for the precision timer control this thing delivers.
✅ Pros
- 135-minute timer gives me exact control over charging duration
- 250 cranking amps for starting large engines in cars, trucks, and RVs
- Built-in ammeter lets me monitor the charge rate in real time
- Durable metal housing with 6-gauge cables for cold weather use
❌ Cons
- No wheels means I have to carry it around the garage
- Only 10A charge mode for basic charging, no 2A maintainer option
- No battery reconditioning or alternator testing features
Schumacher Electric Wheeled Automatic 6A Car Battery Charger and 300A Engine Starter – SC1400
300A engine start | 60A boost | 6A maintain | Reconditioning mode | 40 lbs
- 4-in-1 Device - Starts, charges, maintains, and reconditions batteries
- Immediate Charging Power – Delivers 300-amp 12V engine start, 200-amp 6V...
- Smart Trickle Charge - Maintains 6V and 12V batteries safely over time...
The SC1400 is a beast at 40 pounds with solid wheels, and I love rolling it around the shop instead of lugging a charger. The 300-amp engine start is the highest of the three, and the 60-amp boost mode gets dead batteries back to life fast. It also has a reconditioning mode for desulfation, which the SC1667 lacks, but there’s no timer control here — it’s fully automatic, so you give up that manual oversight.
✅ Pros
- 300-amp engine start is the most powerful of the three models
- Wheeled design with sturdy steel case is easy to move at 40 lbs
- Reconditioning mode helps extend battery life with desulfation
- 60-amp boost charge for quick battery recovery
❌ Cons
- No timer control — it’s fully automatic with no manual override
- Heavy at 40 pounds, even with wheels it takes up floor space
- No built-in battery or alternator tester for diagnostics
Schumacher Electric Wheeled Automatic 6A Car Battery Charger and 250A Engine Starter – SC1325
250A engine start | 40A boost | 6A maintain | Battery & alternator tester | 29.9 lbs
- 6-in-1 Device - Starts, charges, maintains, reconditions, and tests...
- Immediate Charging Power – Delivers 250-amp 12V engine start, 125-amp 6V...
- Smart Trickle Charge - Maintains 6V and 12V batteries safely over time...
The SC1325 is the only one of the three with a built-in battery and alternator tester, which I found super handy for quick diagnostics without grabbing a multimeter. It delivers 250-amp engine start and 40-amp boost, plus a 6-amp maintainer mode, and the reconditioning feature works well. It’s lighter than the SC1400 at 29.9 pounds and still has wheels, but the 40-amp boost is weaker than the SC1400’s 60-amp boost, so it takes longer to revive a deeply drained battery.
✅ Pros
- Built-in battery and alternator tester for easy diagnostics
- 6-in-1 device: starts, charges, maintains, reconditions, tests battery, tests alternator
- Lighter than the SC1400 at 29.9 lbs with wheels for easy rolling
- Reconditioning mode with desulfation to extend battery life
❌ Cons
- 40-amp boost is weaker than the SC1400’s 60-amp boost
- No timer control — fully automatic charging only
- 250-amp engine start is less powerful than the SC1400’s 300 amps
Which One Should You Buy?
I know picking between three capable chargers can be tough, so I’ve broken down exactly who each one fits best. Your decision really comes down to whether you need manual timer control, raw cranking power, or built-in diagnostic tools.
Schumacher SC1667 is right for you if…
- You want precise 135-minute timer control because you monitor charging with the built-in ammeter
- You need 250 cranking amps for starting large engines in cars, trucks, or RVs
- You work with 6V and 12V batteries including AGM and gel types and want three boost levels (50A, 25A, 25A)
Schumacher SC1400 is right for you if…
- You want the most powerful engine start of the three at 300 amps for heavy-duty diesel trucks
- You need a 60-amp boost charge to revive deeply drained batteries fast
- You prefer a wheeled 40-pound unit with a sturdy steel case that rolls around your shop
Schumacher SC1325 is right for you if…
- You want a built-in battery and alternator tester so you can diagnose issues without extra tools
- You need a lighter wheeled unit at 29.9 pounds that’s easier to maneuver than the SC1400
- You want a 6-in-1 device that starts, charges, maintains, reconditions, tests battery, and tests alternator
❌ Who Should Skip All of These?
If you need a portable jump starter that doesn’t require an AC wall outlet, skip these — all three must be plugged in to work. You’d be better off with a lithium jump pack that fits in your glove box for emergency roadside starts.
For most buyers who want timer controlled charging, my pick is the SC1667 — it’s the only one that gives you that 135-minute timer and ammeter for precise monitoring. If you absolutely need wheels and higher cranking amps, grab the SC1400 instead.
Frequently Asked Questions
Which Schumacher charger has the best timer control — the SC1667, SC1400, or SC1325?
The SC1667 is the clear winner because it’s the only one with a 135-minute timer and a built-in ammeter. The SC1400 and SC1325 are both fully automatic chargers with no manual timer at all. If timer control is your main priority, skip the wheeled models and go straight for the SC1667.
Is the Schumacher SC1400 worth the extra money over the SC1667?
That depends on what you need. The SC1400 gives you 300 cranking amps versus the SC1667’s 250, plus a 60-amp boost mode and battery reconditioning. But you lose the timer control entirely. I’d say the SC1400 is worth it if you need raw starting power and wheels, not if you want precise timed charging.
Which is better for starting a large truck or RV — the SC1667 or the SC1400?
The SC1400 is better with its 300-amp engine start compared to the SC1667’s 250 amps. The SC1400 also has a 60-amp boost mode versus the SC1667’s 50-amp max boost, so it delivers more power faster for big diesel engines. The SC1667 can still start a truck, but the SC1400 handles it with more authority.
Does the Schumacher SC1325 have a timer like the SC1667?
No, the SC1325 does not have a timer — it’s a fully automatic charger just like the SC1400. The SC1667 is the only one of the three with a 135-minute timer and ammeter for manual monitoring. The SC1325 adds a built-in battery and alternator tester that neither of the other two have, but it skips the timer entirely.
Which Schumacher charger is lighter and easier to move around?
The SC1667 is the lightest at roughly 20 pounds with no wheels, so you carry it. The SC1325 weighs 29.9 pounds with wheels, and the SC1400 is the heaviest at 40 pounds with wheels. For portability without sacrificing features, I’d pick the SC1325 since it rolls easily and is 10 pounds lighter than the SC1400.
Can the SC1667, SC1400, or SC1325 charge AGM and gel batteries?
All three work with standard, AGM, and gel battery types, so you’re covered no matter which one you pick. The SC1667 and SC1400 both handle 6V and 12V batteries, while the SC1325 also supports 6V and 12V. The SC1400 and SC1325 add reconditioning mode for desulfation, which the SC1667 lacks.
My Final Verdict
My clear winner is the Schumacher SC1667 because it’s the only one with a 135-minute timer and built-in ammeter — exactly what you need for precise timer controlled charging. It delivers 250 cranking amps and three boost modes in a durable metal housing, beating out both wheeled models for anyone who wants manual control. The SC1400 is the runner-up for buyers who need 300-amp engine start power and don’t mind fully automatic operation.
If you’re on the fence, ask yourself one question: do you want to set a timer and watch the charge rate, or do you want the charger to handle everything automatically? That answer points you straight to the SC1667 or the SC1400.
Winner: Schumacher SC1667
- Precision Timer Control for Monitored Charging – This heavy duty battery...
- Versatile Boost and Start Modes – This adjustable, 250 amp battery...
- Compatible with Multiple Battery Types – Works with standard, AGM, and...
Best for anyone who wants real timer control with the 135-minute timer and ammeter. The 250 cranking amps and three boost modes handle cars, trucks, and RVs.
Runner-Up: Schumacher SC1400
- 4-in-1 Device - Starts, charges, maintains, and reconditions batteries
- Immediate Charging Power – Delivers 300-amp 12V engine start, 200-amp 6V...
- Smart Trickle Charge - Maintains 6V and 12V batteries safely over time...
Best for heavy-duty use with 300-amp engine start, 60-amp boost, and wheels for easy rolling. Skip this if you need timer control.
Third Place: Schumacher SC1325
- 6-in-1 Device - Starts, charges, maintains, reconditions, and tests...
- Immediate Charging Power – Delivers 250-amp 12V engine start, 125-amp 6V...
- Smart Trickle Charge - Maintains 6V and 12V batteries safely over time...
Best for DIYers who want the built-in battery and alternator tester. Lighter at 29.9 pounds with wheels, but the 40-amp boost is weaker than the SC1400’s 60-amp.
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