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I found this on the WWW with no pro / con reviews to run two 4 cell battery packs together using two BMS devices for 12VDC 38120S batteries. Have you done this? How well /did not did they work? Thank you for any helpful info.

As I've posted on this forum, I just built two identical 39120S battery packs. Each one producing about 13.2 VDC. The charging cables showed up today. 5 wire. I hooked up the ISDT Air8 battery charger after hooking up the wiring to the Positive out put terminal and negative output terminal as...

Are today's LIFePO4 chargers really smart? If you charge for a few hours and need to shunt the charger down, the battery is charged to 88%, and start the charge ten minutes or the next day later, does the battery charger remember where it left off? Does it sense the mAh stop point and continue...

I've done a search here and not found what I need to know. I'm going to use 8 ( eight each ) 38120S LiFePo4 batteries to build a portable battery pack for my HAM radio which I will be running at 100 watts ( 22 amp draw on transmit ) I can either use 2 ( two ) packs of four batteries each having...

About a year ago I assembled a 12 volt battery pack for my Ham Radio. It has worked very well giving me several hours of operating time at 100 Watts out of the radio. There are two 4-cell 38120S batteries running in parallel out to one power plug. I'm using an "Air-8" charger for the pack...

38120S cell in a pack of four for 12 VDC under load. The battery is new as of January 2024 and was fully charged. I went to use it today and the battery pack was reading 6 VDC. I took a reading of the four cells and found the new battery was only showing 2 VDC. ( should be 3.3 ) When I hooked...

I assembled an 8 cell 39120S pack of four each for 12 VDC out put. Each pack is charged separately. I posted in the past I got an error on the AIR8 charger "Abnormal Battery Voltage". I re-wired the BMS's and the problem went away for a year. This battery pack is only used a couple times a year...

All of my goodies showed up today and of course things sent were not what I needed or missing data. The BMS was sold with no instructions. The seller says he will not help with "technical" info. The internet was even worse. Here is my BMS's that I bought. They will each fit the battery pack...

My 6 month old ISDT Air8 will no longer charge my 39120S batteries over .1 that is point one amps?( 12 volt pack ) I have the charger set to 1 amp charge to give the cells a longer life and now it will not charge over .1 amps. Every thing is hooked up correctly and I ran the battery pack...

After a couple of months running my battery pack of 8 ea - 38120S batteries, I have a question? My pack is two packs of four batteries for 13.8 VDC, each pack with a BMS. I tie the outputs together in parallel for 13.8 VDC with max current to power my mobile HAM radio which they will do for many...

I'm assembling a 38120S battery pack and need a charger. I found this one for sale with good reviews: https://www.isdt.co/down/pdf/Q6nano_EN.pdf On page 5 it shows the full charge voltage for LiFePo4 and I'm concerned the charge voltage its too high for my 4-cell 38120S battery? I do not want to...