These D size batteries last a long time in my lantern. In six months, I have charged them once. One takes about 10 hours to charge with my "Tripp Lite 4-Port USB Charging Station with OTG Hub", I used the 2-amp/ 5-volt outlets. A red light shows when they are charging and the light changes to green when it is fully charged. The cap is held next to the body by a short rubber band covered in cloth. They are nice because they store SO much energy.
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