Campagnolo EPS V2 Battery Repair

[Diverse]

Hi. Maybe someone here have any experience with replacing power cell in PU14-REEPS for new one?
My battery taking no charge after being discharged for some time. I have disassembled it and found that all 3 Panasonic NCR14400 batteries are completly dead. And I need to replace them. But have been unable to find same batteries for selling anywhere.
Maybe someone can suggest any other batteries to replace my?

P.S. Is there is a chance to use NCR18650 batteries here with standart electronics?

[ferrarista]

As long as you keep the same voltage it should not matter. I doubt the 18650 fit inside the stock casing as they are bigger. 18.5mm x 63.5mm. The NCR 14400 are 14.4mm x 40mm. They are also lighter compared to 18650. 16gr. vs 46gr. The 18650 does have much bigger capacity. . Your battery will last much longer, but will be much heavier. You will have to use them without the stock casing.

http://www.batteryspace.com/aaaaaseriesli-ioncells.aspx

You could use the 14430 instead 17gr. Or maybe the 14500 28gr.

[Diverse]

The main problem that campagnolo stock case is very tight. Most of the space is taken by PCB. And there is not enough space inside it event to put 14430 batteries, because 3 of them will be 9mm larger in overall the stock 14400. The only way to put inside stock case, is to remove protection board from battery pack.

Maybe someone can suggest the way, to make new casing?

As far as I'm understand from this Campa doc (https://www.campagnolo.com/media/files/ ... _09_15.pdf), system operates using 10.8 voltage, so I need to install 3x 3,7 volts battery (14400, 14500 or 18650) in any case?

[ferrarista]

You don't really need to use the stock casing really. The battery goes inside the frame so it is protected from the elements. You could use some battery shrink wrap to hold the cells in cylindrical shape just like the stock battery. It will be lighter than the stock casing. To prevent damage, use some foam around the battery when you install it so that it doesn't move.

Yes three cells at 3.6-3.7v will match the stock voltage.

[UBRUBR]

Hi, I am revisiting an old topic because I am in a similar position. The Chorus V2 battery has completed its cycle. Replacing the battery seems like a simple and inexpensive solution. Has anyone succeeded?

@Diverse?

[graeme_f_k]

Hi, I am revisiting an old topic because I am in a similar position. The Chorus V2 battery has completed its cycle. Replacing the battery seems like a simple and inexpensive solution. Has anyone succeeded?

@Diverse?

Just revisiting this as it's come up a few times recently ...

In our experience, opening & then resealing the PU usually results in unpredictable behaviour of the PU.

I'm not clear why this should be - but I would assume that environmental moisture is the problem. We have opened & re-sealed a v3 PU here, at Velotech, which we use for teaching purposes, which behaves OK but that is never taken outside of a classroom environment (fairly constant temp & dry atmosphere).

On the other hand, we also know that in cases of v2 PUs that open in use (casing distortion / bonding failure) the first sign that something is amiss, is unpredictable behaviour of the shifting system.

We have attempted re-sealing of affected PUs in the past but the problem has still been present, even where casing distortion was not the reason for the bonding to open, as far as we are able to tell (i.e. cases where the PU was fitted below the seatpost, rather than attached to the bottle cage bosses).

The fix in RE / SR is to replace the v2 PU with a v3 long case type PU - part number PU21-11EPS - and a v3 Interface unit IF16-EPS.
The charger is the same.

In CH systems, there is an adaptor kit which requires some modification of the circuit boards on the levers so that a v3 PU & IF can be used.&
It's a Service Centre only kit and includes plug "shunts" to convert the PU's RE / SR plugs to AT / CH type.

We have all the relevant materials here at Velotech.