Unit looks like OEM equipment. Install was straight forward, nothing tricky, worked out of the box. Very Very pleased. Great quality at a reasonable price.

I was send two of the same screwdrivers but luckily I have my own set. But, I love the battery. It really holds a strong charge. It also doesn’t get as warm as my last one. A solid purchase!

This battery fried my Mac. I am a skilled electrical tech and this battery was installed correctly. Anti static wristband was used. The only thing ninja about this battery is its ability to roundhouse your logic board.

Computer became incredibly unstable, restarting and shutting off randomly. SMC reset did nothing. Replacing with another brand fixed issues immediately.

Had my 14 year old son installed it on a 2012 MacBook Pro. Works great. It lasts days before we need to plug it in. That's my feedback.

I ordered a battery a few months ago and as of last week my macbook has "Service battery" notice on and battery charge does not hold at all. I have emailed the company 3 times with no response. I have tried to reach them by there phone number listed on there website. You cant! its out of service.

Update on my first reciew for this battery. Battery does not charge before 6-7 hrs nor has a life to stay for even 2 hrs. Did not come with battery screws. But screwdriver were included. Total crap product. Also, battery depletes way to quick than usual in between if using heavy application like from 63% jumped to 12% for just opening xcode installer on mac.

The Ninja battery replacement for my 2011 MacBook Pro was easy to install and set up. The battery capacity/life appears to be very good but I’ll give it short amount of a test of time to rate it 5 stars instead of 4 stars.

Fits perfectly and works like a charm.When I purchased my MacBook Pro it came with no battery and Now I have a battery that allows me to be mobile with it, but it also has a great battery life to boot. I think I have found my new battery supplier in Ninja Battery's.

Both batteries have a weird habit of charging normally and then when they hit 50% they drop to 7% in an instant. The second battery caused my mac to report saying "Service Recommended" saying how the battery's capacity has been significantly reduced.

These batteries use higher quality cells and perform like the original OEM batteries. The key to choosing seems to be buying a battery that the vendor puts their name on. 9 times out of 10 when I have purchased one with no brand name, they are junk that fail rapidly and are cheap knock-offs.We have installed over 30 of these with no issues in older MacBook Pro laptops under refurbishment.

It doesn't work unless it is plugged in. As soon as I unplug it in the battery goes from 99% to 5% in less than thirty minutes.

Easy to install on my Macbook Pro 15" Early 2011. No issues with connector or overall size. It took a full charge and the battery monitor recognized it. Only had it for about a month so I have no idea how long it will stay good.

I had high hopes for this replacement battery but it is not at all the replacement I was hoping for. Only running a single browser, the battery drops from 100% to 75% then down to 8% and below in less than an hour. I can never trust the percentage left because it drops so inconsistently. It got my computer functioning again from my original battery that completely died on me, but I wouldn't trust using it for more than 30 minutes without a power cord handy. Probably worth spending a bit more on

Super easy to Instal, battery looks and feels high quality. Battery life seems to be about 4-5 hours on continuous use. Thanks for attention!

Less than 20 cycles and the battery health is already at 63%, not sure if bad unit or very poor quality. Extremely disappointed.