2S 3S 4S 5S 6S 8S battery 18650 MJ1 3500mAh 7000mAh 20amps for 10.8v 12.6v For screwdriver battery weld soldering strip 7.4V 12.6V 16.8V 21V 25.2V 29.6V   battery pack (customize)

Due to the voltage of single battery may be between 3.6v-4.2v,before we build the pack,we will match the battery filter to ensure the consistency of the voltage/internal resistance/capacity,so if you recieve the battery pack which it's voltage will range to: 3S: 10.8V-12.6V   4S:14.4V-16.8V   5S: 18V-21V   6S :21.6V-25V it will normal,please notice this before you purchase,thank you.