Domestic cottage 6 mobile phone built in ultra thin rechargeable battery, 3.7V 1800mAh not virtual standard Rechargeable Li ion|3.7v 1800mah|li-ion 1800mahli-ion rechargeable - AliExpress
STMicroelectronics Long life Paper-Thin EFL700A39 EnFilm Rechargeable Batteries Available from Mouser