3.7v 25mAh /50mAh /100mAh /200mAh/ 450mAh/ 550mAh/ 1000mAh/ 1100mAh/ 1400mAh/2800mAh /3000mAh /5000mAh /10000mAh Lithium Ion Battery Battery for Power Bank DIY ,Toys or Arduino Projects by Electrica