If you did the same thing the next day, it would count as one charge cycle, not two. A charge cycle happens when you use all of the battery’s power-but that doesn’t necessarily mean in a single charge.įor example, you could use half of your laptop's charge in one day, and then recharge it fully. The MacBook Pro 15' Retina Touchbar 2016-2017 battery (A1820) has a capacity of 76Whr at 11.4V.When you use your Mac laptop, its battery goes through charge cycles.

Previously it was noted that this behavior only occurs on the 820-00163 2015 15' logic board with discrete graphics, but all of the above behaviors have since been observed with multiple 820-00138 2015 15' logic boards that only have integrated graphics. This appears to have something to do with current draw, as it has been reported that disconnecting the trackpad cable may enable problematic batteries to boot boards completely. Some third-party batteries and damaged/depleted/expired batteries will allow the 2015 15' boards to attempt to boot an OS, but they may boot loop indefinitely with or without any user intervention (e.g. Without a battery, a bare board will power on and display a low battery image on the screen, and will not chime. NOTE: All 2015 15' MacBook Pros require a battery to power up and boot an operating system properly.

For some reason it was listed as compatible on A1494 on this page below, we appologize for this error. WARNING: This battery is NOT compatible with A1494 or any other because a) voltage b) cable positioninig on haptic magnet c) connector position compared to 2012. The MacBook Pro 15' Retina 2015 battery (A1618) has a capacity of 99.5Whr at 11.36V. They are electrically compatible, but have the connector in a physically different location. (The MacBook Pro 15' Retina 2012-2014 batteries are the same capacity at 95 Wh 10.95 V. The 2009 battery has a lower capacity at 73 Wh vs the 2010 battery (A1321) at 77.5 Wh. The MacBook Pro 15' 2009-2010 batteries are electrically compatible.

Macbook pro 15 mid 2009 battery