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From: Roger Merriman <roger@sarlet.com>
Newsgroups: rec.bicycles.tech
Subject: Re: Suspension losses
Date: 14 Jan 2025 12:12:13 GMT
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Frank Krygowski <frkrygow@sbcglobal.net> wrote:
> On 1/12/2025 12:30 PM, AMuzi wrote:
>> 
>> https://www.reddit.com/r/cycling/comments/p0vxtq/ 
>> shimano_di2_options_when_battery_dies_mid_trip/
>> 
>> "One temporary solution would be to find someone that has a Di2, unplug 
>> their and your rear derailleur and plug in their cable into your 
>> derailleur. You can then change to the comfortable gear and ride back 
>> home. "
> 
> From the comments there: "My wireless 12speed di2 dies after roughly 2 
> weeks."
> 
> Yow!
> 
> And plenty of copies of "Just charge your batteries frequently!"
> 
> No thanks. I don't even want to have to think about headlamp batteries.
> 
> 
> 
Living in an affluent part of London/Home counties plenty of real word
experience of such systems rather than internet tales of
exaggeration/fabrication etc!

People do run them flat but that’s not because they run out in two weeks
but after years for the hood battery’s, Shimano say up to 3 SRAM say about
2 years.

The derailleurs are more months than years, the front mech being more
demanding than the rear in terms of power consumption but both front/rear
Shimano/Sram seem to last months.

So that the run flat is due to that, ie folks have simply forgotten to
charge as they don’t routinely charge them.

The only downside I’ve noted but this is definitely anecdotal than
statistically significant is of my fellow Gravel club mates which is
relatively small group two of which have had derailleurs electronic
failures, both where covered under warranty, but does bring with it a new
and extra failure point.

And these tend to be more expensive than mechanical.

Roger Merriman