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Powerwall in Backup Mode - Charge only to 80%?

Powerwall in Backup Mode - Charge only to 80%?

I have PW2 that is exclusively used for backup purposes. We have frequent outages in winter, but not in summer. I am not a big fan of letting the battery sit at 100% charge for months at a time during summer. Most EV’s have a charging option that allows the user to only charge only to a certain level (i.e. 80-90%) to extend the longevity of li-ion batteries. Is there a way to accomplish this with PW2? Maybe switch off the battery manually?