HP27 Restoration (Lots of Corrosion)

[calc-calcs]

I've seen it done to some battery packs and I'll admit is a practical way of dealing with it. But personally I like to avoid cutting off that middle section and keep it as original as possible. Once the batteries are inside and thanks to the spring tension, its very easy to charge them individually with a set of solid #22 wires shoved in front of the battery contacts and with a regulated power supply. I don't like to charge both batteries in series at the same time.

My method might be too much for others but basically I just maintain-charge the batteries in my calculators every 6 months or so, so its not a big deal.

Thanks for the tip anyhow.