Hi Crofty,

I would change it if you already have not. I am still learning the details of battery tech, but I have noticed on many solar/battery powered devices at work, that such a voltage drop over time and under load - 12.0 is pretty minimal when under a load.

I think you will get by with your current battery if you ride a lot, but if it sits for a few weeks, change it out. Unless you don't mind bump starting occasionally.

0.3 Volt doesn't sound like much to an electrician, but in an ELV computer governed system it can make a big difference.