NMS8250 battery(?)

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By AxelF

Champion (395)

AxelF's picture

13-03-2016, 16:03

You can allso use this cheap Ni-Mh battery 3,6v 60mah

Installing it is a bit tricky, but if you keep the wires from the motherboard
long enough, by cutting them very close to the old battery
soldering the new on in is a quick fix.

By Wild_Penguin

Hero (644)

Wild_Penguin's picture

13-03-2016, 17:33

AfelF,

I don't think it is good idea to directly replace the original NiCd battery with a NiMH battery. Check some previous posts, this has been discussed and proposed before. NiMH can be used, but some changes to the circuitry is needed (referring to RetroTechies post, limiting charging current).

There are also NiMH batteries available with a form factor more close to the original.

EDIT: I wasn't going to order one, but I tried /checked previously today some of the shops I found, for shipping information and charges. Some of them do not ship to Finland, including the one linked (at least not according to ordering form, one could always ask). Most other shops seemt to ship only to a very limited set of countries or only the shops native country, and / or have exorbitant shipping prices, usually more than the battery itself (which is expensive in it's own regard). So it still stands as such: it is probably more worthwhile to either remove the battery, or replace it with something else - with the required changes to the curcuit to make it safe and functioning correctly! If you can find the original replacement for a fair price, then that can be worthwhile, too, of course.

By Gregory

Master (197)

Gregory's picture

08-10-2017, 12:14

Would this be an alternative?

http://www.ebay.co.uk/itm/Rechargeable-Battery-Pack-Cell-404-For-Phone-Ni-CD-2-3-AAA-3-6V-300mAh-1PCS-/272795775194?hash=item3f83e530da:g:ChsAAOSwRoZZiV39

It's 3.6 Volt but I see that the capacity is a lot bigger than the original one, so I don't know if that would cause any problems with the charging circuitery.

By gdx

Enlighted (5503)

gdx's picture

08-10-2017, 12:29

"Wild_Penguin" wrote:

I don't think it is good idea to directly replace the original NiCd battery with a NiMH battery.

Yes, one type of battery should not be replaced by another.

By Zilogger

Resident (39)

Zilogger's picture

08-10-2017, 20:03

You can us these as well.

https://webshop.nedis.nl/nl-nl/1027031/nimh-90-1
Nedis exists also in Finland.
This is a replacement for the NMS 8250/55/80.

By Taburoto

Champion (318)

Taburoto's picture

09-10-2017, 08:42

I have put two batteries of the ikea type AAA in series and works perfectly

By gdx

Enlighted (5503)

gdx's picture

09-10-2017, 15:31

As long as it has a voltage the SRAM keeps its data but it does not mean that everything works perfectly.

By raymond

Hero (600)

raymond's picture

09-10-2017, 17:10

Zilogger wrote:

You can us these as well.

https://webshop.nedis.nl/nl-nl/1027031/nimh-90-1
Nedis exists also in Finland.
This is a replacement for the NMS 8250/55/80.

Did you try this battery? And does it work well?

By Gregory

Master (197)

Gregory's picture

09-10-2017, 17:42

Zilogger wrote:

You can us these as well.

https://webshop.nedis.nl/nl-nl/1027031/nimh-90-1
Nedis exists also in Finland.
This is a replacement for the NMS 8250/55/80.

Only difference is that the one from nedis.nl is NiMH and the original one is NiCd. So I don't know if it is a good idea to switch from NiCd to NiMH.

By bore

Master (140)

bore's picture

10-10-2017, 09:46

Changing from NiCd to NiMH shouldn't be a problem.
The charging circuit is just a series resistor from 5V and a diode, there is no fast charging going on or anything.

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