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Long times on 3,3V per cell in winter months
3.3v is just falling off the cliff after the "kneebend". You'll have significantly more breathing space if you can start the hibernation at 3.4v.
Modular PowerShelf using 3D printed packs.  60kWh and growing.
What's more useful during winter, an empty powerwall / pack or an at least half charged pack, just in case ?
If you can't quantify how much they cost, it's a deal, I'll buy 5 of them for 3 lumps of rocking horse ......
If these were my batteries I would store at the nominal voltage of about 3.6-3.7vdc…
That said, if you don’t have enough panel or power coming in the charge them up, I would just connect a variable DC power supply or an RC charger and just bump the pack voltage up using mains power.

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