Specifications High-concerned chemical:None Bundle:Bundle 1 Battery Number:1 Size:18650 Replacement Battery:Yes Set Type:Batteries Only Type:Li-Ion Nominal Capacity:3500mAh Model Number:35E Battery Pack Brand Name:MYFKALA Origin:Mainland China Certification:CE The main picture is for reference only. There are different SKU options. Please see clearly and select the corresponding picture window to order. Thank you. Product Description: Model: 2S 3S 4S 5S 6S 8S Screwdriver battery Max. continuous discharge current: 20A Rated capacity (minimum): 3500 mAh(1P) 7000mah(2P) Nominal voltage: 5V/10.8V/14.4V/18V/21.6V/29.6V Charging voltage:7.4V/12.6V/16.8V/21V/25.2V/30V Application: tools battery ,screwdriver battery ,battery pack etc. Packing list: The battery not contains a shelf, More flexible installation,safer to use! Packing list:Shipping by choose different bundle. Notice: 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. Note: Light shooting and different display may cause the color of the items in the picture to be slightly different from the real object. The allowable error of measurement is+/- 1-3cm.