Re: HP-67 w/melted Battery Compartment Door -- It Works! Message #5 Posted by Jeff O. on 15 Dec 2004, 7:28 a.m., in response to message #4 by Paul Brogger
Paul,
Good news about your 67.
Regarding the original cause of the melting, in my marginally educated opinion it probably was caused by an overheated battery. However, I think it was likely a one-time event, caused by a defective battery or perhaps a defective charger. The manual states (Appendix B, page 311 of the Revision C, 12/76 manual):
"If desired, the HP-67 can be operated continuously from the AC line. The battery pack is in no danger of becoming overcharged."
If you use the calculator normally, it should be safe to charge it up in the calculator. Of course if you have some way to charge it externally, that would provide an added measure of safety. Just don't forget that the pack is out and run it off of the charger without the pack, as the manual also states (page 312):
"CAUTION Operating the HP-67 from the ac line with the battery pack removed may result in damage to your calculator."
Edited: 15 Dec 2004, 1:31 p.m.
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