this post was submitted on 13 Feb 2026
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UPS batteries are something i don't understand either. Why have they not changed with all the new tech we have now? Is it just still made of the best chemicals for their use and to then be recycled or something?
Maybe sodium ion will be a suitable replacement.
Yes, lead acid is very reliable and very recyclable.
UPS batteries need to be fully charged all the time. Lead acid batteries like to be fully charged. Lithium batteries need to be stored around 50% charge to have a long lifetime.
Lead batteries are also cheap.
And mine take ~30 minutes to charge. This person may want to replace their batteries.
They're also trustworthy, reliable technology. Why change what isn't broken?
Charge time depends on the UPS. The cheap consumer grade ones usually have a float charger that takes forever.
It's brand new, I'm reading directly from the instructions, if it only takes 30min to change they should say that and it's not by design. It's a CP1500PFCLCD
It makes sense to me to have low power chargers on a UPS. Once your power comes back online, it needs to deliver enough juice to power everything plugged into the UPS plus the battery charger. A fast charger would be more likely to trip a breaker.
There are newer LFP portable batteries with <10ms UPS switch times that charge quickly and will keep the power on longer. They also 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.
Its all fairly new and have been improving year over year. For example, earlier models may not have switched back on if power was out for a long time and it fully drained the battery. Now some models can turn back on.
Edit: more details.