ATTENTION!---------- I too had this issue with my macbook pro 15" running snow leopard . I have two batteries one that functions perfectly and another that was having this very issue ( the reason i ended up here looking for an answer). I tried all applicable suggestions , 3 months, repeated battery installs, sometimes it said under battery health "check battery" other times "service battery" but never "normal" or " good" so i gave up and
shelved the battery. one month ago it dawned on me that maybe it was just a matter of oxidation on the metal connecters on the battery ? so i used a metal dental pick lighty scratched all the connections on the battery , nothing major, PRESTO ! it has since been in my macbook working perfectly , I DO NOT KNOW WHAT RISKS , IF ANY, ARE POSSIBLE , TRY AT YOUR OWN RISK (I did not touch connecters on computer mind you ) funny but it really seemed so obvious afterwards , well i hope this helps somebody , good luck ! 😁