New mini 7S-14S 30A BMS with switch, temp, BT, UART

[Tomblarom]

I needed a small BMS for a project and discovered, that JBD made a new ultra compact smart BMS! It's only 63*52*12mm and has has all these common features!

• 7S to 14S (automatically configuring)
• Continuous 30A, Peak 90A (for 1s)
• Type: Li-Ion (3,7V) or Lifepo4 (3,2V)
• Size: 63*52*12mm
• Mosfets: PES016N08R (2x on 20A, 4x on 30A, 6x on 50A)
• Features:
  • Hardware switch
  • Tempsensor
  • Integrated Bluetooth on PCB
• Protocol: UART (or CAN with adapter.. "Fake CAN")
• App: Xiaoxiang, Software: JBD-Tools

15$ is a reasonable price for 14S BMS under 30A..!

Available here: https://www.aliexpress.com/item/1005004892183305.html
What do you think? Perfect for e-scooter or e-longboard builds!

Images from customers (not me):

 

[dominik h]

I installed one last year and today another one. They dropped the price, very nice.

It has one downside.
I charged my 8S20Ah Lifepo A123 with 20A and it stopped charging because one cell reached 3,65V. The others are 0130-0,2V behind and the bms also stops balancing after this Event.
Normaly a bms stops charging and then balancing goes on.
Tomorrow I will try to get the cells together with a low current charge.

 

[dominik h]

No more downside, found my error in the settings. You have to disable
"charge balance"
to have the balancing working all time.
If it is enabled it balances only when charging, so the balancer could not drain the battery.
But If you want to make a first equalization of your cells you have to turn this function off.

 

[dominik h]

Pictures of the 30/90A version
I killed one , when I changed my charge plug from 2 poles to 4 poles.
Made a perfect short circuit, the contacts in the plug got vaporized.
The 6000A short circuit current was too much for the mosfets.
The installed A123 Lifepo Pouch battery has 2V sag at 500A.