Posts: 36
Threads: 3
Joined: Feb 2008
It was/is never easy to slide the battery compartment open, but what I do is wet my thumb so that it is "sticky", apply firm pressure in the direction of the arrow, but while doing so, you have to "encourage" the tail end of the compartment to rotate up, out of engagement with the housing. Your thumb push is trying to get the compartment to pivot at the arrow.
Takes some practice - I've had 30 years!
Posts: 620
Threads: 14
Joined: Feb 2007
Hello!
Quote:
I see that there's a lovely thumb area, with a helpful arrow, but try as I might I can't slide the darn thing.
This is not a good sign, I'm afraid... I've encountered that once with an HP-21 and it was due to the fact, that the batteries had grown in size due to leakage and corrosion (that had spread through the whole calculator).
If you can't get the batteries out with "thumb-force" alone, pull out the rubber feet and unscrew the screws, that are underneat them. Thereafter, you can open the calculator and remove the batteries without applying brute force.
Good luck with it - the '25 is the nicest of all HP calculators!
Greetings, Max
Posts: 883
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Joined: Feb 2006
NEVER connect the charger to it until everything has been cleaned and tested. In fact, you should never connect the charger to it, period.
Bad battery contact, bad cells or corrosion of any kind will leave you with a fried 25 if you connect the charger.
Once you get the old battery out, test the unit with a bench power supply before going any further.
PS: I think you'll just need to remove the screws to get the thing apart. They are under the top feet. Remove, then push the circuit board out by using a small screwdriver or whatever to push the charger pins into the case, this will pop the top of the keyboard out so you can remove.