... 3) Models: AAA, AA, A, C, Sub-C,18650, 18670, D, etc.4) Long cycles5) Can be trivial ... charging6) Work under extreme temperature environment7) Reliable and safe,8) Very low internal impedance9) Superior charge & discharge feature ... ) Zero maintenanceDetailed Product DescriptionNi-MH rechargeable battery pack capacity:650mAh~9000mAh Voltage:all types battery pack are available both serise or parallel ...