Post by @vga256@tomodori.net

vga256
@vga256 @tomodori.net
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a nec mobilepro handheld computer with its battery pack removed. the pack has room for two 18650 lithium cells, shown in pink above the battery case.
a nec mobilepro handheld computer with its battery pack removed. the pack has room for two 18650 lithium cells, shown in pink above the battery case.

today’s fun permacomputing project: rebuilding the battery pack for the nec mobilepro 790

it turns out that, thanks to a single post dug out of the hpcfactor.com forums, the mobilepro 7xx uses a standard 18650 lithium-ion cell.

they turned out to be surprisingly expensive online, so i checked locally and found someone who had harvested dozens of the cells out of his dead ebike battery. for $2 a cell, i bought half a dozen and can’t wait to repack the battery case.

#permacomputing #retrocomputing

Replying to @vga256@tomodori.net
vga256
@vga256 @tomodori.net
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The battery case has been cut in half along the welding line.
The battery case has been cut in half along the welding line.
The cells removed from the battery case.
The cells removed from the battery case.
An olfa utility knife.
An olfa utility knife.
The cells with their battery management system charge circuit chip.
The cells with their battery management system charge circuit chip.

cell repack method:

- cut along dotted line with precision surgical instrument
- remove cells
- inspect for chemical nightmares

#permacomputing #retrocomputing

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Replying to @vga256@tomodori.net
Peter Redecker
@predecker @mastodontech.de
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@vga256 „surgical Instrument“? 🙂 I opened some 15 year old Dell Batteries and had no chance to ever get them back together. The welding was so strong, they were completely destroyed.