Experimenting with nearly flat Di2 battery

by cojones   June 5, 2013  

I thought I'd see what happens when the Shimano Di2 battery completely runs out. The instruction manual says that the FD fails first, followed by the RD. This is roughly what happened but it took a while.

I first noticed that the green light turned to a red light indicating around 25% charge about 200 miles ago. I kept riding and yesterday, finally the FD failed, and I got the 5 red light flashes saying 'no charge'. I was on the small chainring so was able to get home just shifting the RD. I went out today and it obviously recouped some charge as I was able to shift the FD to the large chainring and back again before it failed again. I continued, shifting the RD just one sprocket as a time rather than using the multishift and about 13 miles later the RD also failed with the 5 red light flashes coming on.

I was able to easily make it to my destination in the gear I was left in and have now put the battery on charge.

I now know roughly how long I've got left when it starts showing the red light in future and thought this may be of interest to someone out there!



2 user comments

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She canny take much more Captain.
Just buy a fixie next time, its cheaper.

I am stronger than Mensa, Miller and Mailer, I spat out Plath and Pinter.

bikeboy76's picture

posted by bikeboy76 [1828 posts]
5th June 2013 - 13:09

1 Like

Use steam power, its more efficient.

Sir Velo

Raleigh's picture

posted by Raleigh [1734 posts]
6th June 2013 - 9:20

1 Like