Wow! This little guy does a great job charging batteries, especially 3.7V. I'm a field engineer and I use a headlamp when I'm working on a PC. With this charger in the car I can keep my battery charged and ready for use. I tested this USB charger and a similar AC charger - this USB charger won at charging completely dead 3.7V batteries. So far all my batteries have been able to stay charged for a full 8-12 hours of continuous use. Get one if you don't already have one, that's great.
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