I have a Droid X, and recently I flashed CM4DX to it. Soon after, when discharging my phone to calibrate, I noticed that the battery would jump from 17% all the way down to 4%. I thought it was odd but I kind of ignored it. But ever since then, always when it gets to 17%, it does that, no matter how many times I calibrate. I thought it might be from flashing 2nd-init recovery, but I don't know why that would make a difference and I think it was jumping before I flashed CWM. Does anyone have any ideas why it may be doing this or how to fix it?