Hi everyone,

I salvaged several SLA batteries, 4 of them are Leoch LP12-45, 2 of them are Fiamm 12FLG42 and the last two are Fiamm 12FLG27. Leoch are from 2017 and Fiamms are from 2015.

I checked them with DMM and voltages were between 12.98 volts, and the lowest one was about 12.75 volts and then i tested them for capacity with some chinese battery tester and i set it acording to battery datasheet and 12FGL27 showed 25.2 Ah capacity and 24.8 Ah out of 27 Ah. One of the Leoch measured only 38.9 Ah and one of the 12FGL42 showed 37.1 Ah.

I read that its good idea when testing capacity on stored batteries to charge them full (14.4V) then disconnect charger for 24 to 48 hrs and then connect it again and repeat this proces several times and then test capacity. Is this good advice ? should i test it that way ?

Also they are used in my backup power system, about once a year. Is it better to fully charge them to 14.4 volts and apply topping charge every month or to charge them to 13.5V and leave them on charger ? (i use CV/CC power supply for charging them and they are in my room, ambient temperature is about 23 to 26C

 

Hi everyone,

I salvaged several SLA batteries, 4 of them are Leoch LP12-45, 2 of them are Fiamm 12FLG42 and the last two are Fiamm 12FLG27. Leoch are from 2017 and Fiamms are from 2015.

I checked them with DMM and voltages were between 12.98 volts, and the lowest one was about 12.75 volts and then i tested them for capacity with some chinese battery tester and i set it acording to battery datasheet and 12FGL27 showed 25.2 Ah capacity and 24.8 Ah out of 27 Ah. One of the Leoch measured only 38.9 Ah and one of the 12FGL42 showed 37.1 Ah.

I read that its good idea when testing capacity on stored batteries to charge them full (14.4V) then disconnect charger for 24 to 48 hrs and then connect it again and repeat this proces several times and then test capacity. Is this good advice ? should i test it that way ?

Also they are used in my backup power system, about once a year. Is it better to fully charge them to 14.4 volts and apply topping charge every month or to charge them to 13.5V and leave them on charger ? (i use CV/CC power supply for charging them and they are in my room, ambient temperature is about 23 to 26C

https://batteryuniversity.com/
and search AAC for "sla battery"