Why do you need this and a bms? the bms is supposed to balance as well?

Most BMS will only balance while the batteries are charging. The active balancer works all the time. It takes current from a battery with high voltage and sends it to a battery with lower voltage.

can the 20s also be used for a 14s and 16s battery and Lifepo4 and LI

I cannot say for sure-- but I wouldn't think so. The unit comes with the number of leads to match the cells and I don't believe it would function correctly without the same number of battery cells connected.

Will this balancer work without a BMS?

Yes it will. You can actively monitor the state of your battery via blue tooth app and it works quite efficiently. Good for older out of balance battery packs.

Why does daly balancer show diferent voltage on the app from my original bms? Some times in 30 mV diference

Probably the accuracy of the voltage reading. These are not "industrial grade" instruments. they are consumer level. A 30mV difference is not too big and nothing to be concerned over.

ASIN	B0B5LJY981
Best Sellers Rank	#197,885 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #773 in Power Converters
Brand	DALY
Color	Smart Active Balancer
Customer Reviews	4.2 4.2 out of 5 stars (128)
Input Voltage	3.7 Volts
Item Dimensions	2.36 x 1.38 x 0.7 inches
Manufacturer	Dongguan Daly Electronics Co., Ltd
Mfr Part Number	AB-1
Model Number	4S 1A B0B5LJY981
Output Voltage	3.7 Volts
Plug Type	Type A
UPC	768655913440
Unit Count	1 Count

Daly Battery Equalizer 4S 1A with Bluetooth App and Wire Leads and Compatible Active Balancer for Lithium Battery Rated 3.7V 3.2V 2.2V

Details

Description

Specifications

Common Questions