Dear friend,How are you? We are professional battery manufactuer in China for 10 years, and known for high quality and reasonalble price.Our batteries are widely used in heat meter, gas meter, ammerter, security equipments.Some of our batteries are listed below,and customized battery packs also can be made according to requirements. LiSOCL2 battery ER14250 3.6V 1/2AA 1200mAh ER14335 3.6V 2/3AA 1600mAh ER14505 3.6V AA 2400mAh ER26500 3.6V C 9000mAh ER34615 3.6V D 19000mAh Lithium ion rechargeable battery 21700 3.7V 4000mAh 18650 3.7V 2600mAh LiFePO4 battery IFR18650 3.2V 1500mAh IFR32700 3.2V 6000mAh Lithium polymer rechargeable battery 063450 3.7V 1200mAh 1260100 3.7V 10000mAh Pls feel free to contact with me if you would like to know more. Best wishes Henry