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Charging di2 batteries with dc power source



 
 
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  #11  
Old October 4th 18, 11:41 AM posted to rec.bicycles.tech
Sir Ridesalot
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Posts: 5,270
Default Charging di2 batteries with dc power source

On Thursday, October 4, 2018 at 3:18:12 AM UTC-4, wrote:
Snipped
"I will admit to not riding the Di2 bike every day and shifting 100+ times on every ride. Its one of many bikes in the rotation and I live where it is flat, so no shifting needed. But charging once in the off season will easily allow you to ride all year long with no charging."

Just curious. If no shifting is needed where you ride then why buy an expensive multi-gear system?

Cheers
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  #12  
Old October 4th 18, 05:25 PM posted to rec.bicycles.tech
ixiz
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Posts: 31
Default Charging di2 batteries with dc power source

On Thursday, October 4, 2018 at 2:47:02 AM UTC-4, wrote:
On Wednesday, October 3, 2018 at 11:47:13 PM UTC+2, wrote:
On Wednesday, October 3, 2018 at 9:10:35 AM UTC-5, ixiz wrote:
On Wednesday, October 3, 2018 at 10:05:45 AM UTC-4, sms wrote:
On 10/3/2018 4:51 AM, ixiz wrote:
I’m not certain hence the question. I do know there are electronics in the battery that uses canbus for communication to other components

The CANBUS data is modulated on the power lines, but I doubt if the
battery has a CANBUS controller inside it.

I dont know much bout electronics - hence the confirmation before i damage anything

I just want to be able to have a charged internal di2 battery when i need it as a loaner or help someone that needs it when as needed - I dont have the new 6880 nor the 8050 system - i have a 6770 (10s) external battery


I really don't think its worth your trouble to even investigate this topic. My 7970 Di2 battery lasts 2-3 YEARS before needing recharge. And when a recharge is necessary, it turns off the front derailleur shifting first, you can still use the rear shifter for many, many miles. Eventually both derailleurs would stop working I suppose. Having a dead Di2 battery is about as common as having a lunar and solar eclipse in a month with two full moons. And Christmas, New Years and Thanksgiving all falling in the same month too.


I agree. I never have to charge my Di2 batteries during the season (road and off road). Just charge once before the season and you are done. Especially on my cross bike off road a shift the crap out of the Di2 system. I don't understand the fear of people of an empty battery on their Di2 system.

Lou


I have come across many variations mine i charge it only once per season (but i have many bikes and 2 are di2 10s - and may only get 2k miles each). I have also repaired many bikes that drains a full charge within 2 weeks 300miles. There is still one bike after even replacing a few components under warranty it still drains the battery overnight (he disconnects the battery after each ride). so yes it has a wide range.
but thats not the OP here
The Q is can the internal di2 battery be charged using a DC charger - output 8.4VDC 0.5A connect via E tube to the BT-DN110
  #13  
Old October 4th 18, 10:25 PM posted to rec.bicycles.tech
[email protected]
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Posts: 2,041
Default Charging di2 batteries with dc power source

On Thursday, October 4, 2018 at 5:41:21 AM UTC-5, Sir Ridesalot wrote:
On Thursday, October 4, 2018 at 3:18:12 AM UTC-4, wrote:
Snipped
"I will admit to not riding the Di2 bike every day and shifting 100+ times on every ride. Its one of many bikes in the rotation and I live where it is flat, so no shifting needed. But charging once in the off season will easily allow you to ride all year long with no charging."

Just curious. If no shifting is needed where you ride then why buy an expensive multi-gear system?

Cheers


I said no shifting. But I do shift a few times on rides. There are a few gradual inclines around me that need me to move up or down one or two cogs. And sometimes there are tailwinds or headwinds which require me to move up or down one cog even on the flat. But your question could also be Why buy an expensive racing bike if you are NOT a Tour de France rider? Or Why buy a 4x4 pick up truck if you live in the south and only drive to and from the grocery store? Or Why buy a heavy duty steel bike when a lighter aluminum or carbon bike is available?
  #14  
Old October 6th 18, 09:04 AM posted to rec.bicycles.tech
[email protected]
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Default Charging di2 batteries with dc power source

On Thursday, October 4, 2018 at 11:25:46 PM UTC+2, wrote:
On Thursday, October 4, 2018 at 5:41:21 AM UTC-5, Sir Ridesalot wrote:
On Thursday, October 4, 2018 at 3:18:12 AM UTC-4, wrote:
Snipped
"I will admit to not riding the Di2 bike every day and shifting 100+ times on every ride. Its one of many bikes in the rotation and I live where it is flat, so no shifting needed. But charging once in the off season will easily allow you to ride all year long with no charging."

Just curious. If no shifting is needed where you ride then why buy an expensive multi-gear system?

Cheers


I said no shifting. But I do shift a few times on rides. There are a few gradual inclines around me that need me to move up or down one or two cogs. And sometimes there are tailwinds or headwinds which require me to move up or down one cog even on the flat. But your question could also be Why buy an expensive racing bike if you are NOT a Tour de France rider? Or Why buy a 4x4 pick up truck if you live in the south and only drive to and from the grocery store? Or Why buy a heavy duty steel bike when a lighter aluminum or carbon bike is available?


The few times you have to shift you might as well shift in style ;-)

Lou
  #15  
Old October 7th 18, 06:06 PM posted to rec.bicycles.tech
Jeff Liebermann
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Posts: 4,018
Default Charging di2 batteries with dc power source

On Tue, 2 Oct 2018 21:06:13 -0700 (PDT), ixiz
wrote:

Is it possible to charge an internal Di2 battery using a etube spliced
to a dc battery charger with the correct dc voltage. Like to have a
charged internal battery in the toolbox when I need it.


Perhaps it would be better to check the battery charge level before
charging? To the best of my limited knowledge, most systems have this
featu
"Check Di2 Battery Status (Updated)"
https://www.youtube.com/watch?v=8yJxaNRLXi8
To check the battery status, simultaneously hold down the
two right hand shifter buttons for a couple of seconds
and the top LED under the battery symbol will illuminate.
A solid green light indicates a full charge. A flashing
green light indicates roughly 50%, a solid red light
indicates roughly 25% and a flashing red light means the
battery is pretty much empty.

I'm not sure what an "etube spliced to a DC battery charger" might be,
but I suspect it's NOT the correct way to charge a LiIon battery. The
Di2 looks like 7.4V at 500 ma-hrs. I use an RC model airplane charger
for most everything:
https://hobbyking.com/en_us/imax-b6-50w-5a-charger-discharger-1-6-cells-genuine.html
I hesitate to recommend one of the smaller and cheaper chargers that
cannot be programmed for the specific battery configuration.




--
Jeff Liebermann
150 Felker St #D
http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
  #16  
Old October 8th 18, 03:48 PM posted to rec.bicycles.tech
SMS
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Posts: 9,477
Default Charging di2 batteries with dc power source

On 10/7/2018 10:06 AM, Jeff Liebermann wrote:

snip

t 500 ma-hrs. I use an RC model airplane charger
for most everything:
https://hobbyking.com/en_us/imax-b6-50w-5a-charger-discharger-1-6-cells-genuine.html
I hesitate to recommend one of the smaller and cheaper chargers that
cannot be programmed for the specific battery configuration.


The "smaller and cheaper chargers" come in 1S (4.2V) and 2S (8.4V) models.

I have one of the balance chargers like yours. It can charge each cell
in a series pack individually, which can be done much faster than
charging a series pack in series with a higher voltage, and it avoids
unbalanced cells.

For a 2S battery, there's no downside in charging it with an 8.4V
charger provided you can get to the charging contacts on the battery
pack and there is no damage to the CANBUS circuitry which modulates
communications onto the power lines.
  #17  
Old October 8th 18, 08:54 PM posted to rec.bicycles.tech
ixiz
external usenet poster
 
Posts: 31
Default Charging di2 batteries with dc power source

On Sunday, October 7, 2018 at 1:06:49 PM UTC-4, Jeff Liebermann wrote:
On Tue, 2 Oct 2018 21:06:13 -0700 (PDT), ixiz
wrote:

Is it possible to charge an internal Di2 battery using a etube spliced
to a dc battery charger with the correct dc voltage. Like to have a
charged internal battery in the toolbox when I need it.


Perhaps it would be better to check the battery charge level before
charging? To the best of my limited knowledge, most systems have this
featu
"Check Di2 Battery Status (Updated)"
https://www.youtube.com/watch?v=8yJxaNRLXi8
To check the battery status, simultaneously hold down the
two right hand shifter buttons for a couple of seconds
and the top LED under the battery symbol will illuminate.
A solid green light indicates a full charge. A flashing
green light indicates roughly 50%, a solid red light
indicates roughly 25% and a flashing red light means the
battery is pretty much empty.

I'm not sure what an "etube spliced to a DC battery charger" might be,
but I suspect it's NOT the correct way to charge a LiIon battery. The
Di2 looks like 7.4V at 500 ma-hrs. I use an RC model airplane charger
for most everything:
https://hobbyking.com/en_us/imax-b6-50w-5a-charger-discharger-1-6-cells-genuine.html
I hesitate to recommend one of the smaller and cheaper chargers that
cannot be programmed for the specific battery configuration.




--
Jeff Liebermann
150 Felker St #D
http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558


Jeff,
How do you connect your RC model airplane charger to the Di2 internal battery ?
  #18  
Old October 9th 18, 02:39 AM posted to rec.bicycles.tech
Jeff Liebermann
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Posts: 4,018
Default Charging di2 batteries with dc power source

On Mon, 8 Oct 2018 12:54:06 -0700 (PDT), ixiz
wrote:

Jeff,
How do you connect your RC model airplane charger to the Di2 internal battery ?


I don't have a Di2 or an electric shifting system. Worse, I can't
tell from photos on the web exactly how the battery connector works.

I suggest you find a EW-SD50 extension cable, which I think will fit
the STM-BTR2 LiIon battery (not sure), cut it in half, and you have
two battery charging cables. Please double check if the EW-SD50
extension will fit the STM-BTR2 battery before blundering forward:
https://www.google.com/search?q=Shimano+EW-SD50&tbm=isch
Strip back the cable jacket and the insulation from the wires, attach
the clip leads that come with the RC charger to the wires, and you
should be able to charge the battery. It would be nice if the Di2
battery had a JST-XH balance charger connector so that the charger can
deal with unbalanced cells. However, with the low current usage of
the electric shifting system, I doubt that it will ever be a problem
unless you abuse the battery in some manner.


--
Jeff Liebermann
150 Felker St #D
http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
 




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