[GoodtoGo]

Wondering if anyone on here has a solution or idea why the rear mech is causing battery drain. Have exhausted what might be causing it. The mech seems to work fine, shifts into all gears, on the small chainring 34 it doesn’t drop in 10 or 11 (which is normal I believe 11 -32), on the large chain ring goes in all gears. Tend to use full synchro in any case.

Have run the pce02 and it’s clearly telling me there is a fault with that component regarding battery drain.

The limit screws seem ok, left in various gears and keeps eating the battery at a rate of 10% every 90 mins or so.

Have tried an identical mech and no battery drain issues. The faulty unit has done many miles but apart from the battery drain it’s in good condition.

Have cleaned the connection cable area, used electrical solution, but all looks clean.

Not sure if anyone has had a similar issue, perhaps opened up the unit to discover if there is some kind of open/close power circuit fix? Or is there anything else to try?

I’ve also tried the crash mode recovery and no change. Can’t hear any noises when not in use.

Topic

[GoodtoGo]

Thanks, I’ve read all the
Thanks, I’ve read all the posts beforehand which led me to post on here. Never seen a solution to this exact issue.. maybe you can’t open them up to investigate…never read of anyone trying. Doesn’t seem like there are any other solutions beyond what I’ve already diagnosed and tried.

[GoodtoGo]

I didn’t realise there are
I didn’t realise there are fake versions of it!…as per my description It’s the rear mech that has the fault.

[GoodtoGo]

Already established it’s the
Already established it’s the rear mech. As per my description of the issue I have swapped out the rear mech with one that doesn’t drain. Run pce02 and yes I use the Shimano tool for all my sd50 cable installations.

[ktache]

Only 4 quid for a genuine

Only 4 quid for a genuine shimano tool…

[VeloUSA]

Try using a Shimnao TL-EW02

Try using a Shimnao TL-EW02 Di2 E-Tube Plug Tool to remove the wire. Don’t remove the wire by hand, use only the tool. Inspect the wire for damage. Check if water has gotten pass the seal. Check for corrosion, etc. Use the tool to re-insert the wire snugly.

[Recoveryride]

This is a good starting point

This is a good starting point:

https://bettershifting.com/how-to-troubleshoot-di2-battery-drain-issues/

I suspect you’re looking at a new rear mech, though. Others may have more helpful suggestions!

[Author]

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