“My other pi5 was switched off for a couple of months. When I powered it up the battery reading was 2.9v so I guess it kept the RTC going. After powering it I monitored the voltage till it was full at 3.2v”
“Does what it says on the tin... then I realised the new case I bought already had one included. Can't complain though - this can go on another Pi at some point I'm sure!”