PC-8801mkII battery removal
Tags: computer nec pc88 pc8801mkii batteries repair
I delved into the depths of my trusty Showa-era NEC to remove its leaking (leaked?) battery. Here’s what I found.
For some reason, the case is held on by large-headed self-tapping screws. This seems really dangerous, but as long as I am careful things will be okay. Inside the machine, there is a ton of structure to this case, with good high quality rolled edges. It’s pretty dirty - the floppy ribbon cables in particular are gross and need a good rubdown before I start thinking about how to add a Gotek.
The floppy drives are really exposed here - they are, as expected, big old 5.25” TEACs. In the future, I’ll have to figure out how to get them out of their rails so I can clean the head and re-lube the slide rails.
Around the side of the case is this monster AC fan. This is probably the loudest fan in my computer collection, including the SGI Octane 2. I gave this a decent blast with the compressed air, and amazingly the bearing still sounds great. Whoever made this should be proud.
This spider died so long ago that he’s pretty much all gone. RIP little guy, I hope you ate some tasty bugs in here before the end.
I reached in with side cutters and clipped the battery leads, not wanting to get too deep into this machine with limited desk space to store all the gubbins.
I was a little surprised to find this odd-sized NiCad battery is 2.4V and only stores 30mAh. This relatively wimpy composition is probably why things weren’t worse when it popped.
With the battery removed, the computer starts up fine still, and
DATE$ continues to think that it is currently
84/00/00. Back to Showa 59, I guess.
You can find new-old-stock Yuasa “MEMO POWER” computer batteries all over eBay, but I’ve yet to find a 2-30FT like this one. I wonder how irritated their sales staff would be to get a cold call asking for a new battery.
I’ll be dismantling this computer further later to remove the remaining leads. I don’t think I’ll be replacing it with a battery holder unless I find out that it is necessary for the continued operation of the machine (or any expansion bus peripherals).
|Battery leaked.||Remove battery, clean area.|