battery replacement help

[hrecker]

hello all, i have a coney island with the mpu2. i have removed the battery from the board and i would like to replace the battery with 3 1.2v rechargeable nicads i was wondering if any of you have done this , or if this is possible without damaging the board or the batteries.
thankyou  for your help

[Brady Miller]

What most people do is scrap the nicads and wire in AA alkalines in a 3 battery holder. I think you can still get them at Radio Shack. Add a 1-2' of wire to it and mount it inside the backbox with velcro. Alkaline batteries today have long shelf lifes but should it ever get forgotten in there and the batteries start to degrade, the corrosion won't run down the long wire and damage the MPU board.

[hrecker]

 i had some re chargables laying around and wanted to use the boards charging ability to keep them charged , i was just wondering if these batteries are compatible with the stock battery voltage/amperage

i mean would these batteries charge in the same way, or... over/under charge  when the game is on, causing a board or  battery failure

otherwise, i will use the alkaline batts with a diode

thanks

[Brady Miller]

If you are replacing nicads with nicads there's no problem. Don't use Nimh. The original batteries were nicads

Thanks for mentioning the diode when using alkalines. I forgot. The diode is need to prevent the MPU from charging the alkalines. Which would be a bad thing.

[hrecker]

i am going to wire up the nicads this weekend . ill keep a close eye on them for a while . lets see what happens
thanks for the help

[hrecker]

the 1.2 v400mha batts work just fine . i put them in a 3x AA battery holder and attached it to the sheet metal with some double sided tape , thanks for all the help


i don't seem to have the attach option so i cant post any pix
let me know when you get this fixed and i will send one

[earlman]

That nicad off-board setup is the way to go. The only way to go. Thanks for the Velcro tip. I tried JB Weld and that wouldn't hold it.

[Peale]

What about a 2032 battery?  Williams videos are often converted from their three AA setup to using one of these.  I did it to my Defender and it works great.