DIY 10ah 4s LifePo4 without a BMS V1.1

DIY 10ah 4s LifePo4 without a BMS V1.1

I had been toying with the idea of more power - either for longer operations or more power or even more devices which such as portable digital operations.

I could have gone the simple Zippy 8400mah blue brick that seems the next step up from my 4200 or.. there is the homebrew route.

Using headway 38120 lifepo 4 cells that are used in E-bikes, and some simple balance extension leads I made Big Bertha v1. 10AH 13.2v. This version does not have a Battery Management System (BMS) and for all intents and purposes, it is seen by balance chargers and even the little cell monitoring beepers that many use, like a big 4s pack.

Photo captions:

8486 - a partially built 4 cell pack comparing size with a 4200 zippy
8532 - I might have snapped up another 2x 4 cell lot on ebay that a company was getting rid of. The orange holders snap together giving the cells rigitiy
8577 - sitting on the bench testing connection to the balance charger - I took extension leads, clipped the socket end off and soldered ring terminals to the ends and connected to the negative of each cell, with one being positive - just the same as the zippy packs
8578 - v1 covered in packing foam, covered in light head shrink bags (x3)
8580 - testing my other balance charger to confirm 12v charging.

Possible improvements - increase the current handling of the load/charging cable for possible QRO operation of the 857.

Coming versions might will likely have a BMS going forward to auto cut off on low voltage.

Shopping list:

Cells, cell holders, bus bars : https://www.evworks.com.au/

The rest was either junk box or ebay

Catch the Sun! Store the power!

SAMSUNG CSC

I seem to have developed a bit of a fetish for batteries.

 

Any one that knows me or reads this blog knows that I love my gadgets. I have specifically designed all of my kit to either be charged by solar (the Goal Zero Guide 7) or via USB.

 

On an every day basis I use the Plox Box. Which replaced one of the 2 Guide 10 Plus battery pack. It was only replaced because I needed more power for my iPhone 5 and USB Wi-Fi. I still used the Guide 10 Plus packs as a solar regulator when items cannot take a direct solar charge due to irregular power delivery

 

 

LtoR Plox, Anker, Xiaomi, Goal Zero