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.

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DALY Smart Active Balancer 4S 1A with Bluetooth for LiFePO4 Li-ion

Product ID: 472961877

Details

Brand
DALY
Color
Smart Active
Input Voltage
3.7 volts
Item dimensions L x W x H
2.36 x 1.38 x
Output Voltage
3.7 volts

⚡0.1-1A balanced current

📶Bluetooth real-time monitoring

🔋0.01V voltage equalization accuracy

€ 56.68

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Sold byAmazon AustriaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔋 Stay Balanced, Stay Ahead: The Smart Way to Power Your Future

ENERGY EFFICIENT DESIGN - Advanced bidirectional DC-DC energy transfer minimizes heat and energy loss for smarter power management.
PRECISION POWER BALANCE - Maintain battery health with ultra-accurate 0.01V voltage equalization for peak performance.
SEAMLESS BLUETOOTH SYNC - Monitor your battery status anytime via intuitive app connectivity—stay ahead effortlessly.
UNIVERSAL COMPATIBILITY - Works flawlessly with any BMS brand and supports LiFePO4 and Li-ion battery packs.
24 7 INTELLIGENT EQUALIZATION - Continuous balancing regardless of charge or discharge state ensures maximum battery lifespan.

The DALY Smart Active Balancer 4S 1A is a cutting-edge battery equalizer designed for LiFePO4 and Li-ion packs. Featuring precise 0.01V voltage equalization and balanced current up to 1A, it extends battery life through efficient bidirectional energy transfer. With 24/7 intelligent balancing and Bluetooth app monitoring, it offers seamless real-time insights and universal BMS compatibility, making it an essential upgrade for professional-grade battery management.

Specifications

ASIN	B0B5LJY981
Best Sellers Rank	#18,137 in Musical Instruments ( See Top 100 in Musical Instruments ) #18 in Equalizers & Feedback Controllers
Brand	DALY
Color	Smart Active Balancer
Customer Reviews	3.7 3.7 out of 5 stars (33)
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
Number of Items	1
Output Voltage	3.7 volts
Plug Type	Type A
UPC	768655913440
Unit Count	1 Count

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