Routejade PD3048-HP2W28-30 Button / Coin 3.7V 300mAh Lithium Ion (LiIon) Battery EACH.
Charge with lithium ion type charger at constant current (max’ 1C) to 4.2V then contant voltage – terminate 0.05.
Additional data sheet information; PD3048-HP2W28-30_2 and PD3048-HP2W28-30_3.