There is also a chance using a non-genuine battery could void the Apple warranty on your MacBook Pro too. Non-genuine batteries may function perfectly well in your MacBook Pro, but you wont be covered by an Apple warranty.
If youre unsure, you can always ask the seller. If they do not state it is genuine, there is a good chance it isnt. Many listings on eBay are for non-genuine replacement batteries - sellers will usually state in the listing title or listing description if the battery they are selling is a genuine Apple MacBook Pro 15 battery. eBay is here to help with the lowest prices on spare batteries for your MacBook Pro 15. But power outlets arent everywhere and being tethered to one is not fun! That is why spare batteries make for great backup when you cant afford to be away from the screen. Those using demanding applications such as games and Wi-Fi/Bluetooth will certainly see a reduction in battery life and may find themselves looking for mains power sooner than expected.
With some users claiming to see as little as 3 to 6 hours of battery life on a single charge, the amazing MacBook Pro 15 may have one shortcoming in the form of limited battery use.
