This is a special-purpose charger just for the rechargeable LIR2450 Lithium Ion coin cells. Slide the coin cell in the right way, and plug into any USB port to recharge - so easy! Takes about 3 hours to charge up, when its done, the green DONE LED will light up to let you know. rechargeable LIR2450 Lithium Ion coin cells Charging is performed in three stages: first a preconditioning charge, then a constant-current 45mA fast charge and finally a constant-voltage trickle charge to keep the battery topped-up. Only for use with rechargeable LIR2450 cells! Do not try to recharge non-rechargeable Lithium coin batteries! Do not charge unattended, do not charge damaged cells. Technical Details https://elecena.pl/product/22711307/lithium-ion-coin-cell-charger-discontinued 2023-03-06 https://elecena.pl/product/22711307/lithium-ion-coin-cell-charger-discontinued 2024-09-19