On Dec 31, 2014, at 4:52 AM, M <[email protected]> wrote:

> Personally, I put a 3 volt camera battery in one of my pre-G3 desktops and it 
> works fine. It was slightly fatter, but the correct length. 

This is a bad idea on desktops, the real 3.6v lithium lasts ~7 years and only 
costs a few dollars off eBay or other online sources, no more cost than this 
wrong camera battery.

This is the “G-Books” lists, he’s asking about laptop PRAM batteries which are 
usually 3 to 6 button cells that are welded together, shrink wrapped, and have 
a wire with a small motherboard connector attached. These cost $20-30 each, 
when the button cells can be bought online for less than $1 for all. The 
problem is constructing a replacement that will fit is very difficult from 
naked OEM button cells.

You can buy the same individual cells with welded tabs on them already, then 
the problem is simplified to connecting the tabs to create the replacement, and 
attaching the wiring, then shrink wrapping the unit. This isn’t easy, but it 
may be doable. The tabbed cells will cost about $4-5, you can use the old 
wiring from the dead battery, and you’d need shrink wrap or good electrical 
tape.

It may be easiest to find a different battery for a different electronic device 
that’s constructed from similar button cells with similar size & voltage to the 
Mac PRAM battery, but with different wire connector, and then cut the wires and 
splice on the Mac PRAM connector. Other batteries are sometimes half the price, 
say maybe $10 or so, but finding one that’s the correct voltage that will fit 
may be harder than assembling a replacement from the pre-welded, tabbed cells.

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