It can be recharged up to 1200 times when fully or partially drained. Improved low self-discharge maintains 75% of capacity after three years of non-use Batteries come pre-charged and can be used immediately out of the package. Fit for flashlight, camera, watch, toys and many other electronic devices. For Battery Charger: This is an EBL Brand battery charger. It could charge two pcs of 16340 /14500 /10440 /18500 /ebl 18650 battery /Lithium battery. Moreover, the charger uses the MCU control technology, providing a constant current and voltage safety model. An indicator light turns green once the battery voltage reaches 4.1V - 4.2V.