Mine seems pretty accurate with an A76/LR44It used a mercury battery, but a plain 675 hearing aid zinc-air battery will work fine.
I've not noticed any battery drain issues - I often carry it around in the bottom half of its case, but when stored away for the day it is usually in its full case. I put a new battery in it when I bought it in 2009, I've not had to change it yet.There is no power off, so you need a lens cap to cover the CdS cell, or you will quickly drain the battery when not in use.
Mine seems pretty accurate with an A76/LR44
I've not noticed any battery drain issues - I often carry it around in the bottom half of its case, but when stored away for the day it is usually in its full case. I put a new battery in it when I bought it in 2009, I've not had to change it yet.
The LR44 will (when fresh) oversupply voltage and cause a more optimistic reading leading to underexposure.
With that said, the meter in the 500G is not particularly well adjusted from the factory, so you may be benefitting from the meter inconsistencies.
It is a good idea to check the reading up against a trustable meter and if necessary compensate on the ASA/DIN dial regardless of battery type used.
I don't recommend using an Alkaline LR44 - it has a unfavourable depletion profile and a nasty tendency to leak. SR44 is a better alternative.
The 675 I mention has a V rating and a depletion profile closer the original mercury battery but it should NOT be left in camera for long time storage either.
The CdS cell draws power when exposed to light. By "when not in use" I didn't mean while around your neck, but when stored - the darkness of a bag is as good as a cap.
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