I say standard because they are used everywhere in panels for fire alarms, security systems, things like that for battery backup. Here's a link to one at home Depot. You can search for 12v 8a SLA battery. I'm sure there's reddit posts and YouTube videos of people diy'ing there UPS batteries
Tried to zap you. No luck. Lost out on 5k sats
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Ok you twisted my arm... I activated my Primal wallet. Not ideal but I couldn't find an easy to setup multinode lightning setup so I gave up on trying to run my own lightning node. If you're still in the giving mood give it another try.