From Newsgroup: sci.electronics.repair


I found some more information.

(I posted originally to sci.electronics.design, it should have been sci.electronics.repair)

On 2025-08-30 13:26, Carlos E.R. wrote:

https://photos.app.goo.gl/qWR1kVNFjcqDP8WT7

The battery, which is not the original, but a replacement bought from
China, is bulging, and made the case to open.

There was no exact replacement. I had to desolder a chip from the
original battery and solder it to the replacement. Not shown well in the photo, it is at the other end. I added a close up photo of the chip.

-a-a The original battery was LP404252ARU, with three wires. One
-a-a for some sort of sensor. Device does not power up with two wire
-a-a batteries. On Aliexpres on 2020 I found a "404252 3,7 V 1200mAh
-a-a bater|!a recargable de pol|!mero de litio para Kobo Touch E-book
-a-a MP3 MP4 Lampe altavoz juguetes banco de energ|!a m||vil 404050".
-a-a The links from back then are dead now.

-a-a I have not searched yet.

I bought another reader a year ago, in May. A Kobo Libra Colour. This
one the company said they would process repairs. Perhaps means spares
will be provided.

Perhaps I should do something to power up the old reader and do a
factory reset, or something, in order to remove the DRM thing from it
(you can only have six on Adobe Digital Editions)

(I don't see a group on epub or ebook readers)

On <https://www.batterytrader.com/kobo-touch-lp404252aru-ereader-battery-replacement-p-43311.html>
they sell the original battery for -u28.98 inc. VAT.

Wow.

Amazon has the two wire version (I would have to replace the PCB) <https://www.amazon.com/404252-1200mAh-Lithium-Rechargeable-Battery/dp/B0F9TC1ZNQ>.
There is no price on the page, but google says "US$34.78".

Aliexpres has the one I bought and that bulged some years later: <https://es.aliexpress.com/item/32808290101.html?gatewayAdapt=glo2esp>
for 4,49re4.


These are the instructions I followed the last time: <https://www.instructables.com/Replacing-Kobo-Touch-Battery/>



It is 3.7 volts, so I will probably rig three standard rechargeable
batteries, size AA or AAA, in a battery holder, and connect it
temporarily, so that I can remove the registration.
--
Cheers, Carlos.
--- Synchronet 3.21a-Linux NewsLink 1.2