Problem with 18650 power bank.

Thread Starter

dr.Ghost

Joined Aug 21, 2019
1
Hey,
Im building power bank, a badass one.I've build half of it, and i have a problem.
I found this QC3.0\PD2.0 65W Circuit Board.
https://www.aliexpress.com/item/32895078662.html?spm=a2g0o.detail.0.0.60487466U9qs9d&gps-id=pcDetailCartBuyAlsoBuy&scm=1007.12908.99722.0&scm_id=1007.12908.99722.0&scm-url=1007.12908.99722.0&pvid=d4780bc1-9fad-4119-9c9d-78ab3e917ba8
They said it has to be connected to 4s battery pack and i have 3s. They just say that input is 4s so 14.8V, but my pack is 11.1V.
How can i connect my 3s to that circuit board so it can discharge and charge my battery pack?
 

KeithWalker

Joined Jul 10, 2017
418
Hey,
Im building power bank, a badass one.I've build half of it, and i have a problem.
I found this QC3.0\PD2.0 65W Circuit Board.
https://www.aliexpress.com/item/32895078662.html?spm=a2g0o.detail.0.0.60487466U9qs9d&gps-id=pcDetailCartBuyAlsoBuy&scm=1007.12908.99722.0&scm_id=1007.12908.99722.0&scm-url=1007.12908.99722.0&pvid=d4780bc1-9fad-4119-9c9d-78ab3e917ba8
They said it has to be connected to 4s battery pack and i have 3s. They just say that input is 4s so 14.8V, but my pack is 11.1V.
How can i connect my 3s to that circuit board so it can discharge and charge my battery pack?
It will not work with only 3 battery banks connected. It will give a fault condition because the forth bank is open circuit.
 
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