Re: HP 45 problem Message #3 Posted by Vieira, Luiz C. (Brazil) on 26 Jan 2005, 3:10 a.m., in response to message #1 by Kevin Kane
Hi;
I own an HP55, and it seems to me they are similar (if I am not wrong, all classics use the same AC adapter/charger).
Kevin wrote: Quote: The rechargeable battery is probably bad, does not work at all without being plugged in.
If you do not plug the charger in an AC outlet and connect it to the calculator, the calculator won't work. The charger itself feeds the calculator with properly voltage while charging. If the charger/adapter is not connected to the AC outlet, connecting the cable to the calculator will simply diconnect the batteries terminals.
If possible and you have the proper means, try testing and charging the battery pack externally. Be carefull choosing an adequate charger based on battery characteristics: I'd use a maximum of 50mA to 60mA of charging current, considerign the batteries are not new and are able to supply at least 700mA. In this case, 60mA would charge them in about 12 hours. In my HP55 I use a thirdy-part battery pack, in fact it is three NiCad cells used in one commercial walkie-talkie.
Hope this helps a bit more.
Cheers.
Luiz (Brazil)
Edited: 26 Jan 2005, 3:12 a.m.
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