![]() 3 x AAA battery holders can be picked cheap on eBay HERE. Think of old batteries in remote controls and what happens to those. These will probably last 3-4 years before corrosion sets in, so mount these battery packs using velco tabs well away from the mainboard. Beware of long term corrosion of alkaline batteries. Incidentally, some original mainboards came with 4.5v external lithium batteries installed. ![]() The 3 x AAA batteries give a total voltage of 4.5v which is above the original 3.6v, however it still works fine and I’ve never lost a mainboard using this method. Plug leads can can be hacked from PC speakers and also some CDROM audio leads also work. Attach this to the external battery connector on the motherboard, but you’ll need solder on a 4 pin plug and lead. DIY external battery holder using 3 x AAA alkaline batteries: Make your own external battery using AAA batteries. ![]() These can be purchased quite easily on eBay HERE.
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