Shimano 9070 Di2 external & internal batteries

Discuss light weight issues concerning road bikes & parts.
PiperGreen
Posts: 5
Joined: Thu Jun 28, 2012 5:08 am

by PiperGreen

I am about to order the Shimano 9070 Di2 Group Set and install it on my current bike. The distributor has it in two forms, external and internal batteries. On my bike, the external would attach to a plate under the bottom bracket that puts the battery against the under side of the down tube. The internal fits into the seat post. From what I have read, the internal battery weighs less because it does not have to be weather sealed. Here are two questions I need answers to and have found nothing.

What process is required to charge the internal battery?

Assuming that charging means the additional inconvenience of pulling the seat post periodically, does having to do so outweigh the savings in weight and the visual disappearance of the battery?

Thank you in advance for your thoughts and they will influence my decision.

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rmerka
Posts: 618
Joined: Wed Mar 06, 2013 4:23 pm
Location: Austin, TX

by rmerka

It charges through a port on the front junction box under the stem. No need to remove the seat post.

PiperGreen
Posts: 5
Joined: Thu Jun 28, 2012 5:08 am

by PiperGreen

Thank you, I hadn't thought about that as a charging method, but it makes sense that Shimano did it that way. So now the decision is down to weight savings and esthetics.

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fa63
Posts: 2260
Joined: Mon Feb 19, 2007 7:26 am
Location: Atlanta, GA, US

by fa63

In which case the internal battery wins on both fronts :-)

Dammit
Posts: 443
Joined: Sun Mar 27, 2011 8:16 pm

by Dammit

Image

Vs.

Image

The front junction box needed is annoyingly expensive though, plus you have to spend another £50 on cables for the shifters.

RobH
Posts: 19
Joined: Thu Aug 09, 2012 12:32 am
Location: Melbourne, AUS

by RobH

I have the internal battery on my c'dale EVO and it is very neat and tidy, tucked into the seat post. I am looking at changing seat post from FSA to ENVE and when that happens the battery will be in the seat tube with foam around it to stop it rattling. Charge through port is simply plug in via USB cable. V happy
Rides Cannondale System 6
Cannondale Capo
Masi Speciale (city bike)
2013 Cannondale EVO Di2 on order

Dammit
Posts: 443
Joined: Sun Mar 27, 2011 8:16 pm

by Dammit

BCR2 plugged into the junction box?

PiperGreen
Posts: 5
Joined: Thu Jun 28, 2012 5:08 am

by PiperGreen

Thank you all for your quick responses. Of course the idea that the battery might rattle in the seat tube is a little frightening. I just spoke with Gita Bike and Pinarello has an adaptor for use with the Shimano internal battery, so my guess is that rattling will not be a problem. The Pinarello external bracket that mounts under the bottom bracket and against the down tube is made of aluminum, so I doubt that the internal battery adaptor would weigh more. That brings it all back to the weight differential of the batteries. The distributor has (30) 9070s coming in on March 31st and half are already sold, so tomorrow is decision time. Thanks again for the help.

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keith
Posts: 81
Joined: Wed Jul 16, 2008 10:38 pm
Location: North Wales
Contact:

by keith

No rattling possible with the internal battery, it comes with a push fit sleeve for most / any seat post.
Riding my road bike in North Wales

http://www.strava.com/athletes/keith_robertson

n1klass
Posts: 30
Joined: Sun May 20, 2012 5:52 pm
Location: Stockholm, Sweden

by n1klass

Mine didn't come with a sleeve.

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keith
Posts: 81
Joined: Wed Jul 16, 2008 10:38 pm
Location: North Wales
Contact:

by keith

n1klass wrote:Mine didn't come with a sleeve.


Ooh dear... All I know is I've seen a photo with the internal battery surrounded by a bulgy sleeve:

Image

I've got a Di2 9070 group-set on order, so I hope mine comes with one!!
Riding my road bike in North Wales

http://www.strava.com/athletes/keith_robertson

Horacio
Posts: 216
Joined: Sat Jan 21, 2012 5:28 am

by Horacio

I got a new batt in the box and it didn't come with that butt plug or O ring.

trilocus
Posts: 216
Joined: Tue Oct 04, 2011 9:16 pm

by trilocus

can i install the battery in a cervelo s5 with aero seatpost?

Horacio
Posts: 216
Joined: Sat Jan 21, 2012 5:28 am

by Horacio

I did get the two "sleeves", various washers and "C" clip. It all seems quite useless. Suppied directions make no mention of the items.
Seems Shimano was sweeping the floors and just tossed the stuff in the box.

ipenguinking
Posts: 468
Joined: Sun Jan 09, 2005 5:14 pm
Location: Sunny So Cal

by ipenguinking

I believe the bulgy sleeve in the pictures is from Trek and came with Madone 7k.

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