Stair lift lead-acid batteries - dead after 1 month
The long term &quot;float voltage&quot; is 27.1V for a flooded lead acid battery (at room temperature).
When recharging, it is common to pull them up to above 28V until the current drops below some threshold and then go down to 27.1.
Not an ad for them but this can help:
https://www.power-sonic.com/blog/how-to-charge-a-lead-acid-battery/