please check compatibility before purchasing. Compatible with A42-K55 A45 A45DE A45DR A45VD A45VM A55 A55A A55A-SX060V A55DR A55V A55VD A55VJ A55VM A55VS A75DE A75VJ A75VM F75A-EH51 F75A-WH31 F75VD F75VD-EB51 F75VD-TY163H K45DR K45VD K45VM K55A K55DE K55VD-DS71 K55VJ K55VM-SX086D K75VJ N55 N55SF N55SL P55VA R400D R400V R500A R500D R500N R500V R500VD R500VD-RS71 R500VM R500VM-SX142V R505 R550CM R700A R700V R700VM R704A-TY260H U57A X45VD X55 X55A X55C X55U X55VD X75VB. Designed For :Compatible Models: A45 A45D A45DE A45DR A45N A45V A45VD A45VG A45VM A45VS A55 A55A A55D A55DE A55DR A55N A55V A75 A75A A75D A75DE A K45 K45D K45DE K45DR K45N K45V K45VD K45VG K45VM K45VS K55 K55A K55D K75 K75A K75D K75DE K75V R400 R400D R400DE R400DR R400N R400V R400VD R400VS R500 R500A R500D R500DE R700 R700D R700DE R700DR U57 U57A U57D U57N X45 X45A X45C X45U X45V. ~Brand Name :WISTAR ~Certification. :BIS Certifications ~Model Name :Compatible with A42-K55 A45 A45DE A45DR A45VD A45VM A55 A55A A55A-SX060V A55DR A55V A55VD A55VJ A55VM A55VS A75DE A75VJ A75VM F75A-EH51 F75A-WH31 F75VD F75VD-EB51 F75VD-TY163H K45DR K45VD K45VM K55A K55DE K55VD-DS71 K55VJ K55VM-SX086D K75VJ N55 N55SF N55SL P55VA R400D R400V R500A R500D R500N R500V R500VD R500VD-RS71 R500VM R500VM-SX142V R505 R550CM R700A R700V R700VM R704A-TY260H U57A X45VD X55 X55A X55C X55U X55VD X75VB Compatible Part Numbers: A32-K55 / A33-K55 / A41-K55 / A42-K55. Feature 1 :Battery Use Tip: 1. if it possible then remove a charged battery when your device is plugged in. 2. If possible then try to use energy - saving settings on your electronics. 3. Charge fully your new lithium - ion battery for the first three cycles. 4. Avoid exposure to extreme temperatures also your battery can die if there will to fast temperature changes from low to high. 5. Always use the proper ac adapter charger for your device.