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Dreamcast VMU Li-ion battery mod

megavolt85

DreamShell Developer
Original poster
Registered
Jun 17, 2019
216
565
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www.dc-swat.ru
AGName
megavolt85
AG Join Date
01.09.2015
yesterday I was sitting in VK.COM and saw a person asking what this inscription means on VMU
avito-1633534133434-shot.jpg

some time ago I was presented with a VMU in which several pixels on the screen are damaged and two buttons are missing (B and MODE), I decided that the time had come to restore this VMU, but this is not enough, I am not ready to buy batteries in batches, so it was decided to modify the VMU with a rechargeable battery

1) remove IC5
2) Remove D5 and solder pins together
3) unscrew the positive contact and screw in the self-tapping screw without it
4) cut off the negative contact along the bend
5) glue the battery with two-sided tape to the board
6) stick the charging controller to the battery on two-sided tape
7) solder ground to the charge controller and to the battery
8) solder plus to the charge controller (BAT +) and to the battery (B +)
9) solder the wire from pin 2 (+ 5V) or CE1 capacitor to the charge controller (IN +)
10) cut out the battery compartment in the case

TP4056 charge controller, micro usb connector must be removed

The Li-ion battery was sized according to the size, I took a 150 mah battery from cheap wireless headphones

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9TGkwu6NTdI.jpg

charging
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charge complete

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Anthony817

Well-known member
Community Contributor
Registered
Jun 2, 2019
414
563
93
AG Join Date
May 12, 2010
Incredible mod! Nice work man!
 

fafadou

Well-known member
Registered
Aug 16, 2019
206
119
43
AGName
fafadou
Do you have any advise for removing, the micro usb connector properly ?
 

megavolt85

DreamShell Developer
Original poster
Registered
Jun 17, 2019
216
565
93
www.dc-swat.ru
AGName
megavolt85
AG Join Date
01.09.2015
remove either with hot air or with a soldering iron diluting with a large amount of solder
 

DeanBMT

New member
Aug 16, 2019
2
0
1
AGName
dean2007
AG Join Date
10/04/09
Just tried this and not working for me.
Probably done something stupid 🤣

It’s charging when plugged into Dreamcast but no life when unplugged.

Bat+ to battery +
Bat - to battery -
In + to cap
In - to ground
D5 soldered together

Am I missing something?
 
Last edited:

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