High Quality Lithium-ion and LiFePo4 battery cell/battery pack for E-Bike. We also have many different size lithium-polymer cells for GPS/GSM/Mobile and other electronic products ER Series Model List: ER14250 1/2AA 3.6V 1200mAh ER14335 2/3AA 3.6V 1650mAh ER14505 AA 3.6V 2700mAh ER17335 2/3a 3.6v 2200mAh ER17505 A 3.6V 3500mAh ER18505 A 3.6V 4000mAh ER26500 C 3.6V 9000mAh ER34615 D 3.6V 19000mAh ER261020 CC 3.6V 17000mAh ER341245 DD 3.6V 35000mAh ER9V 10.8V 1200mAh Lithium-ion/Polymer battery 18650 3.7V 2000~2600mAh 26650 3.7v 4000-5000mAh 103450 603262 503479 505068 6032100 and so on~