I just spent nearly two hours reading related posts here. I am a limited knowledge beginner. I have learned a lot from this forum. But, I still don't understand one nagging issue in my mind.
A quick recap:
- Early this year I had four (cheap) Chinese 150Ah LiFePo4 batteries fail, i.e. would not charge. With help from this forum, I learned the cause was the cheap built-in BMS.
- To keep my system running, I purchased a new "Lynx" 12V 200Ah LiFePo4 Prismatic battery with a built-in Daly BMS. It has been working great.
- Recently, the Chinese seller of the previously failed batteries sent me a "free" 200 Ah LiFePo4 battery. I assume because of the size it uses the larger round cells -- which are cheaper I am sure -- like the batteries that failed. It is in a case, so I do now know anything about the built-in BMS. I prefer not to tear it apart and replace the BMS. But, I suppose that is one option.
My worry is:
Is there any risk of damage to my new Lynx battery if I wire these two batteries in parallel . . . because of the different LiFePo4 battery types and unknown BMS compatibility? The positive system connection would be from the new Lynx battery and the negative connection from the replacement round-cell battery terminal and unknown BMS.
If this can create problems, is there any solution?
Thank you in advance for your help in clarifying.
jesfl
A quick recap:
- Early this year I had four (cheap) Chinese 150Ah LiFePo4 batteries fail, i.e. would not charge. With help from this forum, I learned the cause was the cheap built-in BMS.
- To keep my system running, I purchased a new "Lynx" 12V 200Ah LiFePo4 Prismatic battery with a built-in Daly BMS. It has been working great.
- Recently, the Chinese seller of the previously failed batteries sent me a "free" 200 Ah LiFePo4 battery. I assume because of the size it uses the larger round cells -- which are cheaper I am sure -- like the batteries that failed. It is in a case, so I do now know anything about the built-in BMS. I prefer not to tear it apart and replace the BMS. But, I suppose that is one option.
My worry is:
Is there any risk of damage to my new Lynx battery if I wire these two batteries in parallel . . . because of the different LiFePo4 battery types and unknown BMS compatibility? The positive system connection would be from the new Lynx battery and the negative connection from the replacement round-cell battery terminal and unknown BMS.
If this can create problems, is there any solution?
Thank you in advance for your help in clarifying.
jesfl