Welcome to M240 world.
I see that you own two M lenses.
How about the other I think that it's 35mm and not "34", as in your signature.
Concerning the batteries:
Are they Leica 14499- BP-SCL2 ?
If yes, you can check for the date coding engraved on the battery as " 1916VB" on one of mine, for example (not on stickers ) means week 19 of 2016 (meaning of VB, I don't know, maybe Varta Battery ?).
In my M240 manual, Leica recommand to replace them after four years of use.