Di2 battery not included?

A quick internet search shows the Di2 battery is 7.4 V, 530 mAh which
supposedly lasts 1600 km depending on temperature and shift frequency.

http://artisancycles.com.au/article-custom-di2-battery-for-cyfac-absolu/

Assuming 30 km/h average speed, 1600 km is equivalent to 53 h of riding.

Di2 average current and power consumption:

530 mAh / 53 h = 10 mA.

10 mA x 7.4 V = 74 mW.

I hate charging batteries, as I've noted before. So what would make
this work without batteries? My guess is a linear generator and super cap.

Linear generator for a bicycle has been done.

http://www.slideserve.com/andralyn/energy-harvesting-bicycle-light

And they could generate enough power with this (a little crude, hacked
together assy) to power Di2, 95 - 150 mW.

Is there hope for a battery free Di2 yet?

--
JS.

On Aug 21, 7:34*pm, James wrote:
A quick internet search shows the Di2 battery is 7.4 V, 530 mAh which
supposedly lasts 1600 km depending on temperature and shift frequency.

http://artisancycles.com.au/article-custom-di2-battery-for-cyfac-absolu/

Assuming 30 km/h average speed, 1600 km is equivalent to 53 h of riding..

Di2 average current and power consumption:

530 mAh / 53 h = 10 mA.

10 mA x 7.4 V = 74 mW.

I hate charging batteries, as I've noted before. *So what would make
this work without batteries? *My guess is a linear generator and super cap.

Linear generator for a bicycle has been done.

http://www.slideserve.com/andralyn/energy-harvesting-bicycle-light

And they could generate enough power with this (a little crude, hacked
together assy) to power Di2, 95 - 150 mW.

Is there hope for a battery free Di2 yet?

--
JS.

rechargeables suck; it would ve been... ten times, nay, hundred times
more practical if they incorporated AA standard type.

Op 22-8-2012 1:34, James schreef:
A quick internet search shows the Di2 battery is 7.4 V, 530 mAh which
supposedly lasts 1600 km depending on temperature and shift frequency.

http://artisancycles.com.au/article-custom-di2-battery-for-cyfac-absolu/

Assuming 30 km/h average speed, 1600 km is equivalent to 53 h of riding.

Di2 average current and power consumption:

530 mAh / 53 h = 10 mA.

10 mA x 7.4 V = 74 mW.

I hate charging batteries, as I've noted before. So what would make
this work without batteries? My guess is a linear generator and super cap.

Linear generator for a bicycle has been done.

http://www.slideserve.com/andralyn/energy-harvesting-bicycle-light

And they could generate enough power with this (a little crude, hacked
together assy) to power Di2, 95 - 150 mW.

Is there hope for a battery free Di2 yet?



I would go through all that trouble to avoid charging a battery once
every 2-4 weeks?

Lou

On Aug 22, 10:30*am, Phil W Lee wrote:
raamman considered Wed, 22 Aug 2012 06:06:25 -0700
(PDT) the perfect time to write:





On Aug 21, 7:34*pm, James wrote:
A quick internet search shows the Di2 battery is 7.4 V, 530 mAh which
supposedly lasts 1600 km depending on temperature and shift frequency.

http://artisancycles.com.au/article-custom-di2-battery-for-cyfac-absolu/

Assuming 30 km/h average speed, 1600 km is equivalent to 53 h of riding.

Di2 average current and power consumption:

530 mAh / 53 h = 10 mA.

10 mA x 7.4 V = 74 mW.

I hate charging batteries, as I've noted before. *So what would make
this work without batteries? *My guess is a linear generator and super cap.

Linear generator for a bicycle has been done.

http://www.slideserve.com/andralyn/energy-harvesting-bicycle-light

And they could generate enough power with this (a little crude, hacked
together assy) to power Di2, 95 - 150 mW.

Is there hope for a battery free Di2 yet?

--
JS.

rechargeables suck; it would ve been... ten times, nay, hundred times
more practical if they incorporated AA standard type.

six AAA 1.2v NiMH low self-discharge cells would keep to standard
battery formats and give almost the same voltage, but around 800mAh.
But then you wouldn't be forced to buy replacements at a wildly
inflated price from Mr Shimano, or be forced to upgrade when Mr
Shimano decides to stop selling them.
Throw in a dummy cell so that users could fit alkalines in an
emergency.- Hide quoted text -

- Show quoted text -

ahhh, thanks I was wondering what kind of equivalent power it would
be- I reckon its about the same drain as my polar g3 gps ( 1 duracell
aa lasts about 6 hours continous use)- thats a pretty high drain imho

Lou Holtman wrote:
Op 22-8-2012 1:34, James schreef:
A quick internet search shows the Di2 battery is 7.4 V, 530 mAh which
supposedly lasts 1600 km depending on temperature and shift frequency.

http://artisancycles.com.au/article-custom-di2-battery-for-cyfac-absolu/


Assuming 30 km/h average speed, 1600 km is equivalent to 53 h of
riding.

Di2 average current and power consumption:

530 mAh / 53 h = 10 mA.

10 mA x 7.4 V = 74 mW.

I hate charging batteries, as I've noted before. So what would make
this work without batteries? My guess is a linear generator and super
cap.

Linear generator for a bicycle has been done.

http://www.slideserve.com/andralyn/energy-harvesting-bicycle-light

And they could generate enough power with this (a little crude, hacked
together assy) to power Di2, 95 - 150 mW.

Is there hope for a battery free Di2 yet?



I would go through all that trouble to avoid charging a battery once
every 2-4 weeks?

I've had various electronic items (e.g. a set of electronic calipers,
etc.) ruined because they were not used for a long time, and the battery
leaked and corroded the internals. That would suck with an expensive
Di2 setup.

I suppose if one had a Di2 bike and left on a very long vacation, one
might be able to leave it on a charger. If one remembered, that is.


--
- Frank Krygowski

On 8/21/2012 4:34 PM, James wrote:

Is there hope for a battery free Di2 yet?

It would be quite easy. A hub dynamo, rectifier, and some super caps. It
would not be cheap.

You can buy some LiPo batteries and a charger for around $50.

On Aug 22, 10:14*am, Lou Holtman wrote:
Op 22-8-2012 1:34, James schreef:









A quick internet search shows the Di2 battery is 7.4 V, 530 mAh which
supposedly lasts 1600 km depending on temperature and shift frequency.

http://artisancycles.com.au/article-custom-di2-battery-for-cyfac-absolu/

Assuming 30 km/h average speed, 1600 km is equivalent to 53 h of riding.

Di2 average current and power consumption:

530 mAh / 53 h = 10 mA.

10 mA x 7.4 V = 74 mW.

I hate charging batteries, as I've noted before. *So what would make
this work without batteries? *My guess is a linear generator and super cap.

Linear generator for a bicycle has been done.

http://www.slideserve.com/andralyn/energy-harvesting-bicycle-light

And they could generate enough power with this (a little crude, hacked
together assy) to power Di2, 95 - 150 mW.

Is there hope for a battery free Di2 yet?

I would go through all that trouble to avoid charging a battery once
every 2-4 weeks?

Wow, are you training for something? I haven't done 500 miles in a
week except on tour.

-- Jay Beattie.

Apparently the person writing this post should have done some more internet searching. The Di2 batteries last about 1600 MILES. Not 1600 kilometers. So if the Di2 bike is your only bike, not likely, and you are riding a lot, you can easily go 4-6 weeks before recharging. Does not seem like much of a burden to me. My Di2 bike is one of the fleet. So its only ridden once a week or so. It might get the battery charged once or twice a year. And when the battery gets weak, the front derailleur stops working first. The rear derailleur continues to shift for hundreds of more miles. Easy to figure out you need to charge the battery. The only people concerned about the battery running out are the ones who have never ridden with Di2. The ignorant.


On Tuesday, August 21, 2012 6:34:46 PM UTC-5, James wrote:
A quick internet search shows the Di2 battery is 7.4 V, 530 mAh which

supposedly lasts 1600 km depending on temperature and shift frequency.



http://artisancycles.com.au/article-custom-di2-battery-for-cyfac-absolu/



Assuming 30 km/h average speed, 1600 km is equivalent to 53 h of riding..



Di2 average current and power consumption:



530 mAh / 53 h = 10 mA.



10 mA x 7.4 V = 74 mW.



I hate charging batteries, as I've noted before. So what would make

this work without batteries? My guess is a linear generator and super cap.



Linear generator for a bicycle has been done.



http://www.slideserve.com/andralyn/energy-harvesting-bicycle-light



And they could generate enough power with this (a little crude, hacked

together assy) to power Di2, 95 - 150 mW.



Is there hope for a battery free Di2 yet?



--

JS.

Op 22-8-2012 19:49, Frank Krygowski schreef:
Lou Holtman wrote:
Op 22-8-2012 1:34, James schreef:
A quick internet search shows the Di2 battery is 7.4 V, 530 mAh which
supposedly lasts 1600 km depending on temperature and shift frequency.

http://artisancycles.com.au/article-custom-di2-battery-for-cyfac-absolu/



Assuming 30 km/h average speed, 1600 km is equivalent to 53 h of
riding.

Di2 average current and power consumption:

530 mAh / 53 h = 10 mA.

10 mA x 7.4 V = 74 mW.

I hate charging batteries, as I've noted before. So what would make
this work without batteries? My guess is a linear generator and super
cap.

Linear generator for a bicycle has been done.

http://www.slideserve.com/andralyn/energy-harvesting-bicycle-light

And they could generate enough power with this (a little crude, hacked
together assy) to power Di2, 95 - 150 mW.

Is there hope for a battery free Di2 yet?



I would go through all that trouble to avoid charging a battery once
every 2-4 weeks?

I've had various electronic items (e.g. a set of electronic calipers,
etc.) ruined because they were not used for a long time, and the battery
leaked and corroded the internals. That would suck with an expensive
Di2 setup.

Just buy a new battery pack. Never heard of that problem with Di2
though. It has been ages that I had that problem with any of my battery
powered devices. Batteries are so much better than in the old days.


I suppose if one had a Di2 bike and left on a very long vacation, one
might be able to leave it on a charger. If one remembered, that is.

The battery is NOT a problem with Di2 or Campy EPS when used were it
meant for. Don't make one up especially the people who never used the
system and/or would never buy one in the first place.

Lou

Op 22-8-2012 20:00, SMS schreef:
On 8/21/2012 4:34 PM, James wrote:

Is there hope for a battery free Di2 yet?

It would be quite easy. A hub dynamo, rectifier, and some super caps. It
would not be cheap.

You can buy some LiPo batteries and a charger for around $50.




That would be f*cking ridiculous.

Lou