[RE-wrenches] speaking of batteries

[Steve Higgins]

Even with LFP, mixing different-age batteries is still not the best idea.
Even if using closed-loop communication, they can get out of balance pretty
quickly, which will lead to all kinds of BMS issues.

One of the reasons I suggest using a main positive and negative bus with
breakers: You can easily isolate the parallel strings and charge them
independently to ensure they stay balanced.

Personally, anything older than six months' difference, I would still plan
on balancing every 4-6 months. The harder they work them, the more often
they will need to be balanced.




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On Tue, Apr 23, 2024 at 2:05 PM jay via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> HI All
>
> Speaking of batteries  I wonder what you all make of this.
>
> I was reading the Fortress battery manual and it says they don’t recommend
> adding new lithium batteries to older lithium batteries if the age is over
> 1 year difference.
>
> Thoughts?
>
> thanks
> jay
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