Battery life is, indeed, a G3 issue. When I first noticed it in November, Cycleops didn't know what was causing it. Since then, I've replaced two batteries on a bike that is used sparingly in Minnesota winters. Earlier this week I heard from Cycleops that they believe they have fixed a firmware bug that is causing this. The new firmware is being tested and if everything goes well, they'll have an update and instructions on applying it soon. You can contact Cycleops customer support email from their website if you have further questions.