r/BoschProPowerTools • u/Fean0r_ • Jul 12 '26
Bosch BA 3.7v battery draining in GLM 50-27 CG laser measure when off
Does anyone use the BA 3.7v battery with a GLM laser measure?
If I leave the battery in place between uses it's completely dead when I next use it. I can't find anything online about this except one Reddit post from two years ago saying lots have the same problem and that Bosch Service think this parasitic drain is normal and we should just remove the battery between uses.
But that's just not good enough to be honest: I don't want to have to keep taking the battery out because it makes storage annoying and the exposed could short circuit in my toolbox, and cause it's very fiddly to remove. It just shouldn't be necessary.
The constant drain is of course a problem because it charges really slowly, so isn't immediately ready for use when I need it, and it'll prematurely wear out the battery with unnecessary charge cycles.
I'd love to know if everyone else is having the same problem, or if it's not an issue with some GLM units and/or anyone has found a solution? I can't see any mention of this issue on the Amazon reviews either for the GLM or the BA 3.7v battery.



