This is a practical battery for MacBook Air 13" A1245 A1237. Under normal circumstances, the more cells decide the greater mAh. With 4 cells, this battery will satisfy your demand. It could give you the portability and efficiency during using especially when you are outdoors. And this battery will certainly make your laptop regain energy by the use of the high capacity battery. It provides you with the strong battery life, which is great to solve the problems of the short life and poor performance. With fine workmanship and strict examination, this battery is up to standard that you can trustingly use it without any worry.                                    Features            You can get long hours of battery life without having to frequently plug into recharge with itUsing advanced cell technology and quality parts, it guarantees the stamina to meet your need of long work sessions and travelManufactured to the highest quality available with true enhanced performancePowered by high quality cellsCan be charged while it is installed and the computer is connected to AC power                                                             Specifications            Dimensions    11.29 x 4.72 x 0.28" / 20.7 x 12 x 0.7 cm (L x W x H)    <br>
Weight    13.12 oz / 372 g    <br>
Color    Black    <br>
Voltage    7.2V    <br>
Capacity    37Wh    <br>
Battery Type    Li-ion Polymer Battery    <br>
Cell    4 cell    <br>
Compatible with    MacBook Air 13" A1237 MacBook Air 13" A1304 MacBook Air 13" MB003<br>
MacBook Air 13" MB003J/A MacBook Air 13" MB003LL/A MacBook Air 13" MB003TA/A<br>
MacBook Air 13" MB003X/A MacBook Air 13" MB003ZP/AMacBook Air 13" MC233*/A<br>
MacBook Air 13" MC233CH/AMacBook Air 13" MC233LL/A MacBook Air 13" MC233TA/A<br>
MacBook Air 13" MC233X/A MacBook Air 13" MC233ZP/A MacBook Air 13" MC234*/A<br>
MacBook Air 13" MC234CH/A MacBook Air 13" MC234LL/A MacBook Air 13" MC234TA/A<br>
MacBook Air 13" MC234X/A MacBook Air 13" MC234ZP/A MacBook Air 13" Z0FS    <br>
replace part numbers    A1245    <br>
                                                            Package Includes            1 x Battery<br>