Posts: 9
Threads: 4
Joined: Mar 2010
Like these?
http://cgi.ebay.com/HP-97-and-41C-printer-Calculator-Battery-pack_W0QQitemZ220578379673QQcmdZViewItemQQptZCalculators?hash=item335b7ef799
Posts: 182
Threads: 21
Joined: Apr 2006
I don't know if it's possible check a battery pack without a preliminary complete charge in a reserve power pack, printer or calculator that is good. Maybe it's no possible.
Afer a good charge for at least 8 hours or more, if the akku have a capacitance >= of the originals, you must remove the battery pack and connect a 5 ohm, 10%, 10W resistor across the battery contacts. After 45-60 minutes, remove the resostor and measure the DC voltage between the battery contacts. If the voltage is less than 4 Vdc, the battery pack is bad. If the voltage is at least 4 Vdc or more, the battery pack is good.
Before to check the battery pack, is a good thing verify if the charger is functioning properly. You cam perform this procedure: measure the power outlet voltage (Vin) using an ac voltmeter. Plug the recharger into the outlet and measure the recharger ac output voltage (Vout) under no-load conditions using an ac voltmeter. Vout should be between 9.9 and 13.3 Vac at power voltage of 110 or 220 Vac. Vout should equal (Vin/110)x11.6 Vac +/- 1.7 V or (Vin/220)x11.6 Vac +/- 1.7 V. Vin is the AC voltage of the power outlet). If Vout is outside the allowable range, the recharger is bad. If Vout is inside the range, connect a 12-Ohm, 5%, 5W resistor across the recharger output contacts and measure the ac voltage across the load: if the voltage is between 5.3 and 7.3 Vac the recharger is good, otherwise it should be discarded.
Hope this my contribute could help you.
Take care
Ignazio
Edited: 31 Mar 2010, 1:41 p.m.
