Replacing Famicon Cart's Battery

[Nero86]

Is there any tutorial to replace Famicon cart's battery?
I'm just afraid to open it because I can see no wires, are them under the label?

Thank you very much!   

[xIceMan]

Famicom batteries work just like NES/SNES batteries. They're soldered directly onto the PCB.
Link: http://www.mmmonkey.co.uk/cartridge-battery-replacement/

I haven't tried installing a battery holder yet but replacing them only requires basic soldering skills.
The worst part is to open the games that have no screws.

I follow these tutotorial to open cartridges.

https://www.youtube.com/watch?v=llnjYvB_BtA
https://www.youtube.com/watch?v=LgCiAOmgeFc

Both work but be careful to not break the tabs!

[number47]

Pretty simple procedure if you have a shelf full of junk PC motherboards to scavenge.
I have soldered battery holders to Super Famicom Yoshi's island and Famicom Kirby. SFC was a bit harder - it must have been some kind of eco-friendly solder that didn't want to melt at all.

[xIceMan]

For SFC/SNES games I recommend using higher temperatures or resolder some tin on it first so it melts easier  while sucking it off. Some batteries are indeed a pain.

[number47]

A lot of flux and 450°C got it eventually loose.

[Nero86]

Thank you very much for all support and videos!   

[fredJ]

I've tried to open more than 10 carts and only 1 time didn't break the tabs.

I just tried the method in the first video and broke another 4 carts.

[xIceMan]

First method seems fake. I tried it as well. Tabs do break with that method, since some, if not most, are very tight.

I recommend using the second method but it isn't too save either...

[fredJ]

First method seems fake. I tried it as well. Tabs do break with that method, since some, if not most, are very tight.

I recommend using the second method but it isn't too save either...

Yes I have heard that method 2 probably works.
I don't have such a tool to try it with though. Maybe I'll get it some day.

[number47]

The first method works better in warm conditions. Cold plastic is brittle.