1 batt uncharge very fastMazatrol Cam M-2

[sve0019]

My Mazak VQC 20/40B Mazatrol Cam M-2 uncharge the first battery very fast.
(2 and a half day)but the to other batteries kep power for long time.(unleast
60 days) FX784-8,FX727 and FX784-9 have all there own new batteries and machine charge them corecly to 3.6 volt.
People told me FX784-8 card is wrong and i have to change it however i
messuered the card with amp-meter and card take only about 2.5 mah when
it outside machine and not conected to machine.Therefore i belive the card is okey.Charging seams well and i checked power unit voltages as well.
Please answer if somebody knows about the problem.