HP-50G Excessive Battery Drain / Fix?

[HrastProgrammer]

(05-27-2015 05:08 PM)jebem Wrote:  To check for a normal power supply input impedance values:
- Using a wire to short positive and negative terminals in the battery compartment during at least 5 seconds to discharge the capacitor;
- Using a digital multimeter, selecting Ohms auto-range, negative probe to negative terminal and positive probe to positive terminal: initially the reading resistance is very low, but a few seconds later the reading should be above 5MOhm.
- Now, selecting voltage readings in the multimeter, we should read a positive voltage, typically around 0.4V and the value should not decrease with time.

I measured it and the resistance stabilized at around 3.8MOhm while the voltage stabilized at around 300mV. There are some small signs what looks like a leakage in the battery compartment but after I opened the calculator I don't see any damage on the PCB, I mean - no traces of leakage on PCB.

Edit: I checked it after a few minutes and it looks like both are still going down ... resistance is at 3MOhm and voltage at 200mV. But, this is to be expected, isn't it?