Shimano r8070 Di2 with battery draw-battery flat after 2-3 days
10-20-18, 08:53 AM
#1
faster downhill
Thread Starter
Shimano r8070 Di2 with battery draw-battery flat after 2-3 days
I have an ultegra r8070 Di2 groupset on a road bike that is not a year old. It has been flawless up to about 2 weeks ago. Initially after a full charge the battery would last a couple months with average 120 miles a week. I got on the bike the other day and was startled to get a low battery warning on my Garmin so I took my gravel bike and plugged road bike in to charger. after charging to 100% I checked the next morning and was down to 80% and after monitoring it loses about 10-20% charge per day.
I have bluetooth ant device so I can read battery % on my garmin. when I turn on Garmin the Di2 system will not connect unless I "wake up" by pressing a button so I don't think its the ant+ device draining the battery.. I have checked Hi and Lo rear deralleur adjustment and it appears within spec and do not hear any clicking as if out of adjustment. From experience I don't think its the battery because of the slow rate of discharge. I checked firmware and it appears to have latest update.
anyone have experience or insight? My thought is to start unplugging components one at a time overnight and see if draw disappears.
I have bluetooth ant device so I can read battery % on my garmin. when I turn on Garmin the Di2 system will not connect unless I "wake up" by pressing a button so I don't think its the ant+ device draining the battery.. I have checked Hi and Lo rear deralleur adjustment and it appears within spec and do not hear any clicking as if out of adjustment. From experience I don't think its the battery because of the slow rate of discharge. I checked firmware and it appears to have latest update.
anyone have experience or insight? My thought is to start unplugging components one at a time overnight and see if draw disappears.
10-20-18, 09:09 AM
#2
FLIR Kitten to 0.05C
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What does your junction box say about the battery level?
IME I never trusted the Garmin Di2 battery readout...it was never close to accurate on my Edge 1000-always warning me of low battery on Di2 even after I just charged it.
IME I never trusted the Garmin Di2 battery readout...it was never close to accurate on my Edge 1000-always warning me of low battery on Di2 even after I just charged it.
10-20-18, 09:18 AM
#3
faster downhill
Thread Starter
it mirrors my Garmin. after being out of town for 5 days Di2 battery completely discharged.
10-20-18, 10:04 AM
#4
- Soli Deo Gloria -
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Also visually inspect the wires to the extent that it is possible.
Reboot the system with battery disconnect/reconnect is easy and cheap. Always do the easy and cheap thing first.
You might also look for a shop which can do diagnostics.
-Tim-
10-20-18, 10:17 AM
#5
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Your battery "gage" might be due for a recalibration. Just let it run all the way down to shut off then fully recharge.
10-20-18, 08:02 PM
#6
Senior Member
Can you disconnect the battery entirely from everything? Do that and let it sit 3 days, if it's dead, the battery has gone bad.
10-21-18, 09:03 AM
#7
faster downhill
Thread Starter
I have unplugged battery, not for 3 days, but for an hour and plugged back in. battery will recharge to 100%. right now I have removed ANT+ device and recharged battery and checking periodically. still at solid green light on control unit after overnight, so from my understanding battery at 75-100% charged. from what I have experienced it will take until tonight/tomorrow to drop below 75% if there still is a parasitic off-draw.
10-27-18, 02:26 PM
#8
faster downhill
Thread Starter
After isolating each component and monitoring battery I came to the conclusion that the wireless unit was causing the off draw. I replaced the ant+ wireless unit which I have inside my seatpost and the off draw is gone.
