DISCLAIMER: This item is a sophisticated electronic controller. You will need skill and knowledge to install it and use it. You will need to have done research, some available on YouTube - search "eBike School" and "Jehu Garcia" by example to find out what a bms is, what it does and especially how to install it. Wiring diagrams and how to use the bms are found on this listing. It will not be possible to return this item once opened and used, but most especially due to use or damge caused by negligence or lack of knowledge.
This bms is for a Lithium-ion battery. Not suitable for a LiFePO4 battery
2S 20A 7.4V 8.4V 18650 Lithium Battery Protection board BMS board Balance
NOTE: after batteries connected to BMS please connect charging voltage for short time to the BMS to activate it.
Soldering is required for this bms and it does not include wires
Applicable scope: Suitable for lithium batteries with nominal voltage of 3.7V and full voltage of 4.2V (including 18650, 26650, polymer lithium batteries, without limitation on the dimensions)
Product Size: 48*20*3.4mm
Charging voltage: 8.4V - 9.0V
Continuous discharge current (upper limit): 20A (If the cooling environment is not good, reduce the load current use)
Continuous charge current (upper limit): 10A
Standard Edition: Suitable for starting drills with currents up to 25A below 50W, or resistive loads below 168W.
Balanced version: Suitable for starting currents below 25A and below 50W power drills, or resistive loads below 168W, with balanced charging function.
Note 1: The successful start of power drill requires two 10C-20C power batteries, or four 5C-10C power batteries (ordinary 18650 can not start drill! ! !); 0V and 8.4V cable, use 2 square mm Above copper wire (cannot use nickel plate!!!)
Note 2: Connect 0V, 4.2V, 8.4V according to the diagram strictly. When connecting the battery for the first time, it needs to be charged before output.
Note 3: When the battery is charged, “430” resistance heating is a normal phenomenon, indicating that the equalizing circuit is working; if the “430” resistance is also heating in the state of not charging, please check whether the wrong line is connected.
For some customers with poor electronic foundation, please explain: Do not mix good batteries and bad batteries together! The capacity/internal resistance of 2 batteries should be as close as possible! (1 good battery + 1 bad battery = 2 battery use effect).
1* BMS board