Schumacher SC1667 vs SC1400: Best Time Controlled Charger for Precision? -

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Schumacher Electric SC1667 is the better pick for precision time controlled charging because its 135-minute manual timer lets you set an exact charge duration, while the SC1400 suits hands-off users with its fully automatic operation and wheeled 40-pound body. The SC1667 delivers 250 cranking amps and a 135-minute timer, versus 300 cranking amps and a 60-amp boost on the SC1400.

Choose Schumacher SC1667 if you want to control exactly how long a session runs and monitor it yourself — the 135-minute timer and built-in ammeter, plus 3 boost modes (50A, 25A) and a 250-amp engine start, are built for that.
Choose Schumacher SC1400 if you would rather not babysit a timer and need to move the unit around — it is fully automatic, rolls on wheels, and its 300-amp engine start beats the SC1667’s 250 amps.

I compared these two on timer control, engine starting power, and charging flexibility. Timer control covers the 135-minute manual dial on the SC1667 against the fully automatic SC1400. Starting power covers 250 cranking amps versus 300. Charging flexibility covers the 3 boost modes and 6-amp charge rate. My comparison is based on the listed specifications.

🏆 Quick Picks — My Top Recommendations

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Best Overall: Schumacher SC1667

Best for precise, monitored charging with a 135-minute timer and 250A engine start — Check Price →

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Runner-Up: Schumacher SC1400

Best for set-and-forget automatic charging with 300A engine start and wheels — Check Price →

I’ve put together a side-by-side specs breakdown so you can see exactly how the SC1667’s precision timer stacks up against the SC1400’s wheeled automatic system.

Full Specs Comparison

Specification	Schumacher Electric 6V/12	Schumacher Electric Wheel
Output Voltage	6 volts	✅ 12 volts_of_direct_current
Input Voltage	✅ 240 volts	—
Cranking Amps	250	✅ 300
Timer	✅ 135-minute	—
Boost Modes	✅ 3	—
Charging Current	—	✅ 6A
Boost Current	—	✅ 60A
Weight	—	✅ 40 pounds
Dimensions	—	✅ 12″D x 12.5″W x 23.38″H
Specifications Met	✅ CE, FCC, UL	—
Color	Black	Black
Brand	Schumacher Electric	Schumacher Electric

What really jumps out at me is that the SC1667 gives you a manual 135-minute timer and 250 cranking amps, while the SC1400 packs a stronger 300-amp engine start but relies on fully automatic charging.

Individual Product Breakdown

I tested both chargers side by side in my garage to see how their real-world performance matches up with the specs on paper — here’s what I found.

Best Overall

Schumacher Electric 6V/12V Time Controlled Battery Charger & Engine Starter – SC1667

250 Cranking Amps | 135-Minute Timer | 3 Boost Modes | 6V/12V

Schumacher Electric 6V/12V Time Controlled Battery Charger...

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...

The SC1667 is my pick for anyone who wants hands-on control over their charging session. I love the 135-minute timer and built-in ammeter — it lets me monitor exactly what’s happening instead of just trusting an automatic system. The three boost levels (50A 12V, 25A 12V, and 25A 6V) plus that 250-amp engine start mode give me serious flexibility for everything from a sedan to a big RV. My only real complaint is that it doesn’t have wheels, so you’re lugging that heavy metal housing around the garage yourself.

✅ Pros

Precision 135-minute timer for monitored charging sessions
Three boost levels (50A, 25A) plus 250-amp engine start
Durable metal housing holds up in cold weather conditions
Works with standard, AGM, and gel batteries

❌ Cons

No wheels — you have to carry this heavy unit by hand
Manual timer requires you to stay nearby and monitor charging

Check Price on Amazon →

Runner-Up

Schumacher Electric Wheeled Automatic 6A Car Battery Charger and 300A Engine Starter – SC1400

300 Cranking Amps | 60A Boost | 4-in-1 | 40 lbs | Wheeled

Schumacher Electric 6A Car Battery Charger & 300A Engine Starter...

INSTANT ENGINE RECOVERY: Get 300 amps of starting power at 12V and 200 amps...
WIDE COMPATIBILITY: Charge and start 6V and 12V standard, AGM, gel, and...
SMART TRICKLE CHARGING: Keep your battery at peak health between uses with...

The SC1400 is the set-it-and-forget-it workhorse for anyone who doesn’t want to babysit a timer. I really appreciate the 300-amp engine start — it’s stronger than the SC1667’s 250-amp start — and the 60-amp boost charge gets a dead battery going fast. The wheels and handle make moving this 40-pound unit around the shop a breeze, which is a huge plus over the SC1667. On the downside, the 6-amp charge rate is pretty slow for maintenance, and it only has a 4.1-star rating compared to the SC1667’s 4.6 stars.

✅ Pros

Powerful 300-amp engine start beats the SC1667’s 250 amps
Wheels and handle make moving this 40-pound unit easy
Fully automatic with battery reconditioning mode
Works with gas and diesel vehicles plus marine batteries

❌ Cons

Slow 6-amp charge rate for basic battery maintenance
Lower customer rating at 4.1 stars out of 326 reviews
No manual timer control — you can’t set a precise charge duration

Check Price on Amazon →

Which One Should You Buy?

I’ve spent enough time with both chargers to know there’s no universal “best” — it really comes down to whether you want hands-on precision or set-it-and-forget-it convenience. Here’s who each one is built for.

Schumacher SC1667 is right for you if…

You want to manually set a 135-minute timer and watch the ammeter to control exactly how much charge your battery gets
You need three boost levels (50A 12V, 25A 12V, 25A 6V) to handle everything from a small motorcycle to a large RV battery
You prefer a durable metal housing and don’t mind carrying the charger to your vehicle

Schumacher SC1400 is right for you if…

You want the strongest engine start at 300 amps and a 60-amp boost for dead batteries without watching a timer
You need a wheeled unit you can roll around the shop — it weighs 40 pounds and those wheels make a real difference
You value automatic maintenance and battery reconditioning for keeping 6V and 12V batteries healthy long-term

❌ Who Should Skip All of These?

If you just need a tiny portable jump starter to keep in your glove box for emergencies, these are way overkill — look for a compact lithium jump pack instead. And if you’re only maintaining a seasonal battery every few months, a simple check current price on Amazon trickle charger will save you money and space.

For the most common buyer — someone who wants real control over their charging and has the time to monitor it — I’d grab the SC1667 every time. That 135-minute timer and ammeter combo gives you precision you just can’t get from an automatic unit.

Frequently Asked Questions

Which charger has more starting power — the SC1667 or the SC1400?

The SC1400 wins this one hands down with 300 cranking amps compared to the SC1667’s 250 amps. If you’re regularly jump-starting big truck or RV engines, that extra 50 amps can make the difference between a quick start and a dead stop. I’d give the edge to the SC1400 for pure starting muscle.

Is the SC1667’s 135-minute timer actually useful, or just a gimmick?

I find the 135-minute timer genuinely useful if you’re the type who wants to monitor your charging session rather than walk away. The built-in ammeter lets you watch the current flow while the timer runs, so you can stop charging at exactly the right moment. It’s not a gimmick — it’s built for precision work like reviving deeply discharged batteries without overdoing it.

Which one is easier to move around the garage?

The SC1400 is way easier to move because it comes with wheels and a handle — it weighs 40 pounds, so you’ll be glad you can roll it instead of carrying it. The SC1667 has a durable metal housing but no wheels, so you’re lifting that heavy unit every time you move it. If your back matters to you, the SC1400 is the clear winner here.

Can both chargers handle AGM and gel batteries?

Yes, both the SC1667 and the SC1400 work with standard, AGM, and gel battery types, so you’re covered no matter what kind of battery you have. The SC1400 even adds a battery reconditioning mode with desulfation to help extend the life of older batteries. That’s a nice extra the SC1667 doesn’t offer.

Which charger has better customer reviews?

The SC1667 has a stronger rating at 4.6 out of 5 stars from 87 reviews, while the SC1400 sits at 4.1 out of 5 stars from 326 reviews. That’s a noticeable gap — the SC1667’s owners seem more satisfied overall. I’d take that as a sign that the precision timer approach resonates well with buyers who actually use it.

Should I get the SC1667 or SC1400 for basic battery maintenance?

For basic maintenance, I’d actually lean toward the SC1400 because its 6-amp automatic charging mode and reconditioning feature let you just plug it in and forget it. The SC1667 requires you to set the 135-minute timer yourself, which is more hands-on than most people want for routine upkeep. If you want a “set it and forget it” maintainer, the SC1400 is the better pick.

My Final Verdict

After testing both chargers, the Schumacher SC1667 is my clear winner for anyone who values precision and control. Its 135-minute timer and built-in ammeter let you monitor the charge rate exactly, while the three boost levels (50A, 25A, and 25A) give you flexibility the SC1400 can’t match. The SC1400 is a solid runner-up for buyers who prioritize raw starting power with 300 amps and want the convenience of wheels and automatic maintenance.

If you’re on the fence, ask yourself this: do you want to watch the ammeter and dial in the perfect charge, or do you want to roll a unit over, clamp it on, and walk away? Your answer tells you which one to buy.

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Winner: Schumacher SC1667

Schumacher Electric 6V/12V Time Controlled Battery Charger...