My Makita 3/8 drill from the mid 90's. Still using the original battery! Forgotten about in the bottom of a drawer for a decade. Charged it up and it's good to go.
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How To Battery Hack a Makita 9.6v - Easy Lithium Ion Conversion Upgrade - YouTube
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Makita CLX228AJ 12V Max Li-ion CXT 2 Piece Kit comprising HP333DZ, TD110DZ Complete with 2 x 2.0 Ah Li-ion Batteries and Charger Supplied in a Makpac Case : Amazon.co.uk: DIY & Tools