A fully charged lead acid battery will be ~ 12.66 V . A battery needs ~ 13.5 V applied in order to charge then let is sit for a few hours for the surface charge to dissipate before testing open circuit voltage.

What method did you use to get 12.7 ?

If the battery was 12.7 a few hours after a charge then dropped to 12.2 after a few days, the battery is failing. Try a load test as this will test capacity.

0.45 MA is almost nothing as it is sub 1 MA unless. Or do you mean 45 MA ( 0.045 A ) or 0.45 A , 0.45 A would be a lot.