My dad found his old HP-21 and gave it to me! Nice calculator, only I find the rechargable batteries very annoying. When I charge them, sometimes they'll keep a charge and other times they don't accept any power at all! I've checked the contacts, the charger gets warm, the calculator stays cold. Any suggestions? Any place to buy batteries?
One last thing...being new to this calculator and not having a manual, how the heck do you properly use the memory recall arithmatic? Thanks.
HP-21 Battery Charging Problems
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