I hope someone will have the knowledge and experience to assist me regarding HP-35/45/55/65/67/70/80 rebuid battery pack:-
(1) I used the recovered battery pack holder and metal strips and rebuid 2 battery packs using the same type of batteries (NiMh).
(2) After the rebuit, I tested both with digital multimeter and confirm that current are in fact flowing through each pack's metal strips because each pack registered approximate 4.0 volt (freshly charged).
(3) However, and this is the strange thing, one of the pack is working perfectly when I put it into the calculator and the other just failed to light-up the display of the same calculator. I've checked many times and confirm that the metal strips are in fact touching the calculator's contacts, but yet nothing happen!
4) Can someone throw me some light as to how to go about diagnose this?
Your valuable comment is very much appreciated.
HP Classic Models Battery Pack Rebuild
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