This battery is rated 44 Whr. The higher the mAh rating, the longer your battery will run before it needs to be recharged again. There are no compatibility issues if your existing battery is rated at 2200 or 2600 mAh. Simply put, more is better. Specification Battery Type: 6-cell Li-ion Product Type: Replacement Battery Voltage: 11.1 volts Capacity: 4400mAh Compatible with These Original Part Numbers: ASUS:A32-K53,A42-K53,A43EI241SV-SL,A31-K53 Fits ASUS Machine Models: A43,A43BR,A43BY,A43E,A43S,A43SA,A43SD,A43SJ,A43SM,A43SV,A43TA,A43TK,A43U,A45,A45A,A45DE,A45DR,A45N,A45VD,A45VG,A45VM,A45VS A53BR,A53BY,A53E,A53SC,A53SD,A53SJ,A53SK,A53SM,A53SV,A53TA,A53TK,A53U,A53Z,A54,A54C,A54H,A54HR,A54HY,A54L,A54LY A83,A83BR,A83BY,A83B,A83B,A83E,A83S,A83SD,A83SJ,A83SM,A83SV,A83TA,A83TK,A83U,A83T,A84SJ,A84S,A84 K43,K43U,K53,K53BR,K53BY,K53B,K53E,K53SC,K53SD,K53SJ,K53SK,K53SM,K53SV,K53TA,K53TK,K53U,K53Z,K53S,K53T,K54,K54C,K54H,K54HR,K54HY,K54L,K54LY K84,K84C,K84H,K84HR,K84HY,K84L,K84LY P43,P43EB,P43EI,P43E,P43SJ,P43S,P53,P53E,P53SJ,P53S,P53XI Pro4J,Pro4JE,Pro5NE,Pro5NSC,Pro5NSD,Pro5NSJ,Pro5NSK,Pro5NSM,Pro5NSV,Pro5NS,Pro5NTA,Pro5NTK,Pro5NT,Pro5NU,Pro5NZ,Pro5P,Pro5PE,Pro5PS,Pro5PSJ Pro8G,Pro8GB,Pro8GBR,Pro8GBY,Pro8GE,Pro8GSA,Pro8GSD,Pro8GSJ,Pro8GSM,Pro8GSV,Pro8GS,Pro8GTA,Pro8GTK,Pro8GT,Pro8GU X43,X43B,X43BR,X43BY,X43E,X43S,X43SA,X43SD,X43SJ,X43SM,X43SV,X43T,X43TA,X43TK,X43U,X43EC,X43EE,X44,X44C,X44H,X44L,X44E,X44EI X53,X53B,X53TA,X53TK,X53T,X53U,X53Z,X54,X54C,X54H,X54HR,X54HY,X54L,X53X,X53XC,X53XE,X54X,X5P,X5PE,X5PS,X5PSJ X84,X84C,X84H,X84HR,X84HY,X84L,X84E,X84EI,X84EB A43,A43BR,A43BY,A43E,A43S,A43SD,A43SJ,A43SM,A43SV,A43TA,A43TK,A43U,A45,A45A,A45DE,A45DR,A45N,A45VD,A45VG,A45VM,A45VS
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