I tried to use it to charge a badly discharged car battery from the car. I knew that 1000mAh would result in a slow charge, but it took 5 days for the charge indicator to turn green and show a full charge. If you're buying it to continuously charge a good battery to keep it fresh and ready to go, it's likely to work great since it's so sensitive. However, for my intended use, trying to charge the battery in a day or two was unsuccessful. I returned this and received a 4000mah charger to avoid the long wait.
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