Tundra-guy
New Member
- Joined
- Mar 10, 2020
- Messages
- 5
I bought 4 packs from battery hookup back in March. 3 of the 4 are good and giving me the expected 3K out of them when I did my initial capacity test as a stand alone 24V pack. I run them conservatively since they are used, but with a Chargery BMS they seem to stay working well together. I occasionally check the cells and they hover around 3.35V at full charge and I have the BMS disconnect at 2.75V. I haven’t had them that low except for the initial testing I did to see their capacity. Once below 2.65V the cells started to drift off quickly so that’s the window I use these things in. Unfortunatly I had one pack with a bad cell #2 which I decided to try to fix by wiring in a replacement Fortune Cell. We will see once I get it figured out how to safely wire it to the exiting bus bars and cut out the old cell connections. May be a waste of time, but I hate to throw out one pack due to a bad cell. Plus I’m using it in a 48v setup so I need two 24v packs to make it work and I enjoy the challenge.
I decided to cut each main round battery terminal post down about 40% (just off of center) with a small 4” air Power diamond Cutting wheel giving me a flat side. Made easy work of it, just had to take it in 3 cuts so as not to over heat the plastics and melt the plastics around the terminals. I Then center punched the terminal and drilled and tapped to accept a 5/16 Bolt. Slow work and some cutting oil but it came out great and I think it’s a safer connection than forming round pipe to fit. I then bolted a T type fuse and also put a nut at the other end to ensure nothing would come loose. Seems like a solid connection to me. So far I have been happy with them, just had to spend time wiring up the Chargery BMS to each battery and realize their operating window is smaller than a fresh battery. Other than that, it was a great learning experience and have a new appreciation for how LifePO4 works and wiring them together. I follow Will and David and used their wizdom and others to help me, along with my New England ingenuity. Plus I’m not a complete idiot, just a 1/2 idiot
Hope u enjoyed my brief build description.
I decided to cut each main round battery terminal post down about 40% (just off of center) with a small 4” air Power diamond Cutting wheel giving me a flat side. Made easy work of it, just had to take it in 3 cuts so as not to over heat the plastics and melt the plastics around the terminals. I Then center punched the terminal and drilled and tapped to accept a 5/16 Bolt. Slow work and some cutting oil but it came out great and I think it’s a safer connection than forming round pipe to fit. I then bolted a T type fuse and also put a nut at the other end to ensure nothing would come loose. Seems like a solid connection to me. So far I have been happy with them, just had to spend time wiring up the Chargery BMS to each battery and realize their operating window is smaller than a fresh battery. Other than that, it was a great learning experience and have a new appreciation for how LifePO4 works and wiring them together. I follow Will and David and used their wizdom and others to help me, along with my New England ingenuity. Plus I’m not a complete idiot, just a 1/2 idiot
Hope u enjoyed my brief build description.Attachments
Last edited:
