I have recently turned 11,000 miles on mine, with about 7,000 of that on the hub battery. Before that I used a now recalled LiPo battery. My hub battery has recently become flaky. Most, but not all, of the time the charge indicator does not show a full charge after getting a full charge cycle. Usually it is 3 or 4 bars, but I have seen it as low as 2. Sometimes it rides sluggish, sometimes not. This all started after I did a low voltage cutoff/ recharge cycle, and has continued after I did another. I am wondering if anyone has any experience with the end-of-life characteristics of NiMH batteries. Do they fade out gradually, or just tend to quit altogether when they are worn out?