We used several cheap chargers that come "free" with the purchase of the battery. With so many kids and flashlights in our family, charging multiple batteries comes in handy. However, several batteries were destroyed by these cheap chargers, and one charger broke exposing the metal pins to electrical current. Creepy! I went with a more reliable charger and it's really a good buy for the price. The charger came in a nice, sturdy box, well packaged. I felt like I made a premium purchase. I found that 3 batteries were completely burned out, although the "free" charger indicated they were fully charged. The Efest charger worked well with the rest of the batteries including 14500, 18650 and CR123A batteries (the charger can handle more, I just don't have other battery types). The charger states that it is only suitable for 3.6 or 3.7 volt batteries, not for 1.2 volt batteries. The LED display is easy to understand. Haven't tried the USB connector yet, but it's for convenience. The charger also comes with a car adapter for travel use. This charger will be all we need. Cheap "free" chargers are already being recycled.
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