New battery only charges to 52%
I bought a replacement battery for my macbook pro (mid 2009 15 in.,2.66ghz) after replacing the battery it will only charge to 52%. I reset the pram and the smu ,but I get the same result. Hardware readout and coconut say the battery is fine, but I did notice that the amperage from the macs power readout for the battery is negative.
Any ideas what could be wrong, or is it just a defective battery?