Customer reviews from Stanley12volt.com
Stanley - FATMAX 100-Amp 12-Volt Fully Automatic Automotive Battery Charger Maintainer BC100BF
Average customer rating
4.8
(48 Reviews)
Rating breakdown 48 reviews
5 Stars
38
4 Stars
8
3 Stars
2
2 Stars
0
1 Star
0
Customer Reviews for Stanley - FATMAX 100-Amp 12-Volt Fully Automatic Automotive Battery Charger Maintainer BC100BF
Customer Rating
5
Affordable reliable battery maintainer.
on March 5, 2026
Posted by: RiteshP
[This review was collected as part of a promotion.] Picked this up after my old maintainer finally gave out and honestly couldn't be happier with the switch. I use it on my riding mower, a spare car battery in the garage, and a lithium jump starter pack - it handles all three without any fuss. The automatic shutoff is the real star here. Plug it in, forget it, done. No overcharging, no babysitting, no coming back to a cooked battery. That alone makes it worth the price for anyone storing seasonal equipment. Setup took maybe two minutes tops. The clamps are sturdy, the cord length is actually useful, and the indicator lights are easy to read even in a dim garage. Nothing fancy, but everything feels well built and not cheap. Only real gripe is the instruction manual could be a lot clearer on switching between lead acid and lithium modes, but a quick YouTube search cleared that up fast. Minor thing. For the price point, you're getting a dependable, no-nonsense charger that handles long-term storage like a total champ. Highly recommend it.
Written by a customer while visiting Stanley12volt.com
Customer Rating
5
Reliable, Compact, and Easy to Use
on January 22, 2026
Posted by: jenniferb561_1040
[This review was collected as part of a promotion.] I recently received the Stanley FatMax BC100FX battery charger, and I must say, it has made keeping my batteries healthy so much simpler. What I like most is that it works with both lead-acid and lithium batteries, so I can use it on my car, motorcycle, and even some smaller power tools without any fuss. The charger is fully automatic, meaning I can just connect it and leave — it turns off by itself once the battery is full and switches to a maintenance mode. I also feel safe using it because it includes built-in protections like reverse-polarity safety, so I don’t have to worry about hooking it up wrong by accident. It’s not a super-fast charger, but that’s actually a benefit in my opinion because it gently maintains my batteries over time without stressing them out. The design is compact and easy to operate, which is perfect for someone like me who just wants something dependable without extra hassle. Overall, it’s a reliable little charger that keeps all my batteries topped off, and I feel confident leaving it connected when I’m not using my vehicles.
Written by a customer while visiting Stanley12volt.com
Customer Rating
4
Nice product
on January 12, 2026
Posted by: emilym1173_4359
[This review was collected as part of a promotion.] This was sent to me for free by Influenster for my honest review. Pleased with the performance just wish that it didn’t have to be plugged in. Other than that it works well and great size
Written by a customer while visiting Stanley12volt.com
Customer Rating
5
STANLEY FATMAX
on January 10, 2026
Posted by: coralysp1_4144
[This review was collected as part of a promotion.] I LIVE FOR THIS STANLEY BATTERY CHARGER
i will always recommend this one, the functions are amazing and i’ve never seen anything like it. it’s also not too loud!
i will always recommend this one, the functions are amazing and i’ve never seen anything like it. it’s also not too loud!
Written by a customer while visiting Stanley12volt.com
Customer Rating
5
Good at maintaining
on December 31, 2025
Posted by: isaiahb19_2932
[This review was collected as part of a promotion.] Efficiency: Does a solid job maintaining charge throughout the day, even in cold weather. It’s been reliable for keeping a rough-shape battery from dying.
Accuracy: Readouts and charging behavior seem consistent and trustworthy. No surprises while using it.
Setup: Very straightforward — plug it in, connect the clamps, and it’s good to go.
Compatibility: Works well with my battery type and had no issues recognizing it despite the battery being older.
Expectations: Met expectations overall. It’s not meant for fast charging, but as a maintainer in cold conditions, it does what it’s supposed to.
Accuracy: Readouts and charging behavior seem consistent and trustworthy. No surprises while using it.
Setup: Very straightforward — plug it in, connect the clamps, and it’s good to go.
Compatibility: Works well with my battery type and had no issues recognizing it despite the battery being older.
Expectations: Met expectations overall. It’s not meant for fast charging, but as a maintainer in cold conditions, it does what it’s supposed to.
Written by a customer while visiting Stanley12volt.com
Customer Rating
5
Compact battery charger
on December 19, 2025
Posted by: robins173_8073
[This review was collected as part of a promotion.] This has been a useful device to have. Excellent quality and easy to use. I’d recommend this for every household or take it camping. Has so many uses. Light weight , perfect comment size, easy read lcd screen.
Written by a customer while visiting Stanley12volt.com
Customer Rating
5
Works great
on December 14, 2025
Posted by: lindsayb116_1400
[This review was collected as part of a promotion.] This is so convenient to have around. It’s much lighter than I expected, and I love that it charges all types of batteries. I’m keeping it in my car trunk for those times that my kids leave the lights on in the car and kill my battery. So nice for peace of mind.
Written by a customer while visiting Stanley12volt.com
Customer Rating
4
Just what I needed
on December 11, 2025
Posted by: aspoonfull_1162
[This review was collected as part of a promotion.] This little Stanley FatMax is exactly what I needed! The BC100BF to keep the battery in my SUV maintained, and it works great.
It handles both lead-acid and lithium, which is fantastic for versatility. You just hook it up and forget it. The automatic smart charging does all the work. The unit feels very durable, and I've been running it continuously without any issues. It runs cool to the touch. no worrying about excessive heat and I trust the safety features completely. It's compact and very easy to read. While it's not a fast charger for dead batteries, it's perfect for keeping stored vehicles ready to go. Great value and a must-have for winter storage or garage vehicles!
It handles both lead-acid and lithium, which is fantastic for versatility. You just hook it up and forget it. The automatic smart charging does all the work. The unit feels very durable, and I've been running it continuously without any issues. It runs cool to the touch. no worrying about excessive heat and I trust the safety features completely. It's compact and very easy to read. While it's not a fast charger for dead batteries, it's perfect for keeping stored vehicles ready to go. Great value and a must-have for winter storage or garage vehicles!
Written by a customer while visiting Stanley12volt.com