| Toddys Neogeo memory card battery replacement page.
This page is intended as a guide for Neogeo memory card owners
who have “dead” cards with flat lithium batteries
that require replacement. The object is to replace the lithium
without visible damage to the card; I have gone through the procedure
and ended up with a good working card with no aesthetic damage.
Some simple solder work is required and experience in dismantling
and reassembling small electronic devices would be a definite
I take no responsibility for any damage or injury to card or user
that may result from carrying out this procedure.
Materials and tools required.
CR 2016, 3-volt lithium battery, preferably flat PCB mount type,
otherwise see notes below.
Soldering iron and solder.
General purpose clear glue.
Step 1, dismantling the card.
The front cover needs to be removed first, using a razor blade
insert under one of the edges of the front cover, gently work around
cutting through the adhesive (the covers are stuck on with a self
adhesive tape), pouring a little iso alcohol into the area will
loosen the goo and make the job easier. Have patience here, the
razor needs to be moved around with a sawing action, and it will
take time to cut through. Caution: There is a small fine spring
that contacts the front and rear covers in order to create a common
screen or shield, it sits in a hole in the outer plastic frame
of the card. The card seems to work OK without the spring fitted,
you can see the cut out for the spring contact, in the adhesive
on the picture above, as you look at the card front on it will
be on the left 25mm from the top and 5mm in from the edge of the
card. Leave this area to the end, and then gently prize the cover
off avoiding damage to the spring (must confess to damaging the
spring in the process then later loosing it.) The pic on the right
shows the card with front cover removed, the back of the pcb will
be covered with the self adhesive goo, clean this off using iso
on a rag, this pic was taken after the goo was already removed.
It takes a fair bit of elbow grease.
Cut around the front cover, beware of the screen spring. Cover removed.
PCB sitting in plastic card body. Rear of front cover, notice the cut out for
the shielding spring.
Step 2, removing printed circuit board.
Cut into the top of the rear cover, you will only need to cut
in about 20mm along the top to separate the plastic 68 pin edge
connect socket which will allow the pcb to be removed from the
card casing as shown in the pic below.
Cut into top 20mm of the rear cover. Rear cover and main plastic body.
Front, rear cover/main body and printed circuit board separated.
The works. PCB removed with the original lithium battery.
Step 3 Replacing batteries.
The original 3-volt lithium battery is a pcb solder mount Panasonic
CR2016. I was unable to source a board mount type locally so soldered
tags on to each side of a standard CR2016, the type used in calculators
etc. If you are unable to source the solder in type and go for
this method take care not to use excessive heat when soldering
on the tags, it could damage the battery and/or cause the battery
lithium to leak, lithium is nasty stuff- very poisonous I believe,
Remove the old battery; the new modified battery is then soldered
back to the board. Make sure the tag on the negative side has adequate
clearance so as not to short the battery. If the negative touches
the back of the front cover when reassembled, no problem as it
is at the same potential.
New and old lithiums. New battery with tags fitted for mounting
to the pcb.
New battery soldered to printed circuit board.
Step4. Putting back the pieces.
For gluing everything back together I choose general-purpose clear
glue, not wanting to make it too permanent, who knows, it may need
replacing in another ten years.
To keep things together used a makeshift press of two flat surfaces
and part of my library
it folks, but does it work ?????
Alls well that ends well I guess.
Happy Neogeo gaming!
Please email any comments or suggestions to email@example.com