Originally Posted by
MidTNBrad
I've always been curious as to what happens if you run out of battery so I did that earlier this year. On a ride this spring my Wahoo Bolt warned me that my Di2 batter was low, but I ignored it and went on a ride anyway. When the battery got to a certain point the front derailleur stopped working but the rear kept going. I was able to do another 15 miles home in that condition. I figured I pressed my luck as far as I wanted and charged the system from there. Haven't charged it since.
Front derailer uses more power that's why it cuts out leaving u some power to use the back and if your not to far from home. Can more usally get home fine. Also if I'm not mistaking the one time I did run low on power the front will give a few shifts but really slow so if u pay attention u will know what front ring to leave it in. Depending how hilly your ride is