There are newer LFP portable batteries with <10ms UPS switch times that charge quickly and have much longer battery life’s (3000+ cycles), and LFP cells don’t degrade the same when kept at 100% like other types, although you should still cycle them a few times a year.
Bluetti makes some, the elite series has their latest UPS features. The non elite are slower and noisier.
There are newer LFP portable batteries with <10ms UPS switch times that charge quickly and have much longer battery life’s (3000+ cycles), and LFP cells don’t degrade the same when kept at 100% like other types, although you should still cycle them a few times a year.
Bluetti makes some, the elite series has their latest UPS features. The non elite are slower and noisier.