This battery is compatible with MacBook A1990 15" 2018-2019 MR962LL/ EMC3359, be careful before your purchase. ^^The battery has been tested on a working laptop, it can be fully charged and discharged, can replace your old battery. ^^No installation instruction, you can find lots of instruction videos on internet or find a technician for help. ^^Please contact us if you have any questions, we will reply to you within 24 hrs. Abuse review or feedback will void the warranty, please contact us to resolve the issues you got with the product.
^^Need professional installation technology, We won't responsible for any damage due to improper operation.