Mysterious Di2 battery drain

Discuss light weight issues concerning road bikes & parts.
Tristan
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Joined: Wed Feb 22, 2006 7:57 am
Location: New Zealand
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by Tristan

Try unplugging and then re-plugging each of the Di2 wires. I had a similar battery drain and it was a cable which wasn't seating correctly into the Junction A.
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cyclespeed
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Joined: Mon Jun 06, 2016 8:45 am

by cyclespeed

On my 9070 rear mech I never even set the limit screws at all - they were fully wound out. It worked fine.

And yes, DO NOT use any old USB wall socket charger.

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havana
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Joined: Tue Jan 09, 2007 5:04 pm

by havana

Is the Apple USB charger ok?

I don't intend to take my laptop with me on vacation!
Most "innovations" in cycling are solutions for non-existing problems.

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jekyll man
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by jekyll man

havana wrote:Is the Apple USB charger ok?

I don't intend to take my laptop with me on vacation!


I've read somewhere that shimano have changed the required rating for charging, so might be worth checking what your phone charger is rated at first.
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goodboyr
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Location: Canada

by goodboyr

Needs to be greater than 1 amp output.

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havana
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Joined: Tue Jan 09, 2007 5:04 pm

by havana

The Apple iPad charger is 2.1A.
Most "innovations" in cycling are solutions for non-existing problems.

goodboyr
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by goodboyr

Yup. That's not the problem then.

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kulivontot
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Joined: Sun May 16, 2010 7:28 pm

by kulivontot

Take the wheel out of the bike and see if the battery still drains. That'll tell you if it's an adjustment problem

eaglejackson
Posts: 256
Joined: Wed Aug 27, 2014 5:26 am
Location: PNW

by eaglejackson

I had a similar problem this week. I was traveling with my bike. Before I packed it up for the flight home, the Di2 battery level was at 90%. As part of the packing process, I unplugged the 3 Di2 wires that go into the junction box and the 1 that goes to the rear derailleur. I flew home the next morning, a 2 hour flight, and rebuilt the bike that evening. The battery after rebuilding was 5%. What could have caused the battery drain?

beanbiken
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Joined: Tue Mar 18, 2014 10:13 pm
Location: Great Southern Land

by beanbiken

eaglejackson wrote:I had a similar problem this week. I was traveling with my bike. Before I packed it up for the flight home, the Di2 battery level was at 90%. As part of the packing process, I unplugged the 3 Di2 wires that go into the junction box and the 1 that goes to the rear derailleur. I flew home the next morning, a 2 hour flight, and rebuilt the bike that evening. The battery after rebuilding was 5%. What could have caused the battery drain?


Hmmm, sounds like a case of jet lag............... sorry couldn't help myself :oops:
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jeffy
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Joined: Sun Oct 05, 2014 11:51 pm

by jeffy

was the flight particularly draining?

eaglejackson
Posts: 256
Joined: Wed Aug 27, 2014 5:26 am
Location: PNW

by eaglejackson

beanbiken wrote:
eaglejackson wrote:I had a similar problem this week. I was traveling with my bike. Before I packed it up for the flight home, the Di2 battery level was at 90%. As part of the packing process, I unplugged the 3 Di2 wires that go into the junction box and the 1 that goes to the rear derailleur. I flew home the next morning, a 2 hour flight, and rebuilt the bike that evening. The battery after rebuilding was 5%. What could have caused the battery drain?


Hmmm, sounds like a case of jet lag............... sorry couldn't help myself :oops:

Good one. All the same time zone, though. Perhaps the cargo compartment was very cold and the cold drained the battery?

What was funny is that I put a luggage tracking device called a LugLoc in the bike bag. The iPhone app looks for the device, first trying Bluetooth, and if that fails, sees if it can get a GPS location from the device, transmitted over the cell network. After we landed in Seattle but before we got to the gate, while sitting in my seat, I opened the LugLoc app to locate the bag to see if made the flight. It found the device "within 3 feet". The bag must have been directly below me in cargo.

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