I installed this on an older battery that was needing a charge from time to time. It did nothing to improve the performance or longevity of the battery. There is no real way to know if this thing is working correctly. I reinstalled it on the new replacement battery so time will tell. Not certain that this product is a good value.
Verified purchase: Yes | Condition: New
This didn't work for me. I had a car battery that was very weak that I tried it on. I used it with a battery charger for a week. The battery seemed to be a little better but never really fully charged nor held a charge. Perhaps my battery was too far gone. I used this product for about a month before finally getting a new battery.
Verified purchase: Yes | Condition: New
8 yr old battery. Set on shelf for year. So sulfated it would not conduct current. Zero charge. Connected this device in parallel with a charger to battery. Let it run for three weeks. Checking water every day. After three weeks 60% of capacity restored. Checked in car started without problem.
Verified purchase: Yes | Condition: New
Verified purchase: Yes | Condition: New
I'm using 2 and time will tell
Verified purchase: Yes | Condition: New
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