Quality battery, Works well, Warranty covered as well!
342913
This new battery fit perfectly in my old ASUS laptop and brought it back to life after the stock batterys smart controller died. I have now not only gained better battery life and use of my laptop again, but the battery comes with a 12 month warranty as well.
4853993
After reading the many mixed reviews on other battery options available on Amazon, I decided to take a chance on this brand as they've generally been great in the past.

No exception here. I'm getting 4+ hours of screen time and I don't have to worry about running out of power again.

Definitely recommend this battery, it's been great for me so far. Will update if anything changes.
4445012
Obviously there are great reviews about this battery all over the internet, but I had to experience it. I got it recently because of a sale/coupon which made it a great deal and the only reason I bought the white one since the black was out of stock. I'm very satisfied. To give you an idea, I was using gps for about 90 minutes, gaming for about 45 minutes, minor calling/texting, bright screen while watching videos for 30 minutes, and random web browsing. Battery was still at 77% by the end of the day. Great stuff and definitely was worth the price I got it for. I recommend this to anyone, but not the white case for obvious reasons. Also, great customer service.
16525
Easy installation, everything went as expected. The installation video was very clear and helpful. Prior to purchasing the product, I had some concerns about counterfeit or poor quality batteries. However, the battery seems just as good as the OEM battery. My OEM battery could barely hold a charge after >2 years of use and recharge cycles. The only reason why I deducted one star was that the included screwdriver tool had a Phillips bit too large to unscrew the battery from the unit. Unfortunately, the battery screws are very small. I used another electronics toolkit with a tiny flathead bit to unscrew the battery, and successfully unscrewed the battery.

One note: be careful when you unsnapping the case - there are two small plastic pieces in the S-Pen enclosure that can go flying out of the unit. It is easy to put them back in, but I would be mindful of this possibility.
30111
The battery came packaged in a static proof wrapper and had some foam in the box, so it was fairly well protected. The battery fits the model I am rehabbing and seems to have good battery life, similar to the original. No complaints about the fit or the look of the unit. Seems pretty well made. For the price, I can't find any faults with it. I would recommend this battery. I did get this one at a discount in return for an unbiased review, but the full price is a bargain compared to the OEM batteries. You should be fine with this one.
2919209
so far this Anker laptop battery has given me outstanding service. almost 30 days I've been using it... I charged the battery as suggested per instructions... laptop in SLEEP MODE will give me 10 days plus of life so far... it still had 59% life left... I just hope it will last at least 4 yrs. like my last one... there is only one thing about this 12 cell battery, it is heavier than the stock 6 cell battery. so, I just put a small piece of scotch tape on the release button for a little safety. it holds it in just fine now...
197205
Just arrived a few days ago and it seems to be of good quality. I have used Anker, and Zerolemon before but I could not find zerolemon for the G4. Perhaps they ran out. Anyway, this seems to be really close to the zerolemon quality and isn't like some batteries that claim 100000000000 mah and end up sucking. I had a 8700mah battery before and it only lasted 1 and a half days of normal use. This battery seems to last 2 and a half, which is the magic number for me because one and a half means you still need to charge it each night, so you might as well just have the stock battery with a nice case. Many people will easily get 3 or 4 days of normal use from this battery. I use it a lot and leave everything turned on, such as gps, bluetooth, backround apps, wifi and all the wireless radios. Thank you Heliotion or how ever you pronounce that. The case is pretty good, but I would like a thicker one.
3921887
Laptop batteries a strange thing.  For example, replacing them with factory ones can sometimes cost more than the resale of the laptop.  I picked up an X200s for $50 at auction and used some parts around the house to bring it back to life, however the battery attached to it was vintage 2009 and was not charging anymore.  Having had success with Anker's MacBook Pro battery replacement for my wife's C2D MBP, I went ahead and ordered the Anker brand for this one.

On the positive side, this battery works great.  Charges as expected, no problems at all with Lenovo Power Manager, and battery has lasted as expected with moderate work - about 4.5 hours.  While the SL9600 processor sips energy compared to the i5 in the X201, the low-nit screen means you're spending most of your time at 66% brightness.  But, it easily lasts a field trip to Starbucks and a few hours being idle on a desktop.

There are a few negatives.  One that is kind of out of the seller's control is the age of the battery.  While the MBP Anker battery was only two months old, this one was over 6 months old as reported by LPM.  The MBP battery came in at 105% of rated capacity (great!) while this one already was at 97% with 0 cycles.  The locking mechanism is not secure and I once or twice bumped the battery out of the slot if I wasn't careful.  It also slides in and out with more resistance than the factory battery would.

An inconsequential minus is that the pattern of the feet on the battery don't quite match up with the factory pattern.  I thought this was preventing me from being able to dock the laptop into the Ultrabase, however it turns out that it was just a stuck elevator pin in the base itself that was easily repaired with a little pressure.

All in all, while I don't expect non-OEM laptop batteries to have the same fit and finish as the OEM ones, the issue with the locking mechanism not always seating 100% requires me to put a little more effort into keeping an eye on the insert/release battery changes.
4350571
Battery sold by DJW looks to be a good choice. Arrived with 5327 mAH Full Charge Capacity and 1 cycle, better than others I've purchased from different sellers. After 2 months it looks on track to perform with a normal lifespan and durability. Squeezing a little more life out of my 15" MBP, a real gem that's still going for everyday use. Glad they offer these batteries, going to order another from them.
3932008
I shopped around on the internet, and Amazon clearly had the lowest price on this battery (50 dollars cheaper than buying in town - even with a coupon).  I was worried, though, after reading about so many issues with the batteries being delivered damaged or smashed.  Not mine.  Mine was in the original Optima box with HUGE styrofoam protectors surrounding the battery.  The box was extra thick cardboard.  Not only that, but UPS delivered the battery and the box was perfect - really - no dents, no signs of being dropped or mishandled.  And, even better yet is the battery was fresh stock - manufactured in the same month and year that I placed the order.  I am a very happy customer on this purchase.  BTW, when the battery arrived I checked it with my DVM and the voltage was about 12.8 VDC.  I installed it and the car cranked right up!  You can check out my video on how to change this battery on a Suzuki Grand Vitara on YouTube at watch?v=ppqJdzyMZxM&list=UUSZgIbvZItJr78kHY3Y9wnA&index=5

Update:  after just a bit over a year since installation, the negative terminal started leaking acid.  I wrote to Optima and included my Amazon receipt.  Optima notified Amazon directly to issue me a full refund.  I have used and loved Optima batteries for many years, but feel their quality may have suffered when they moved assembly to Mexico.  I have switched to Odyssey.
4551249
The batteries were exactly as advertised, they were delivered in a normal timeframe, there were no issues or hiccups or drama with the vendor.  It was "slam, bam, thank you, sirs or madams."  Battery life is really subjective as everyone's "normal" is different.  But life is definitely restored compared to my original 2 year old battery.  My experience is use of Bluetooth really drains batteries quickly.  But that's a Bluetooth issue that goes away if you don't use Bluetooth.  I have no complaints at all with this product.
445185
I bought this as a replacement battery for a B&N Nook reader in which the battery had literally exploded. Unfortunately, the Nook was beyond saving, and went to wherever Nook readers go when they die, so I never did actually get to USE the battery. However, I was quite pleased with the overall quality of the battery, at a decent price. The tools were a nice touch. Actually made life easier, and I am a nerd with all kinds of tiny electronics tools floating around. The tools that came with it were quite handy, and have been squirreled away for future use with other things.

While I have to wager a guess on the battery's actual performance, I wouldn't hesitate to buy from MPF again.
3950440
Excellent battery at a Great price +++ Ready to go right from the box
4533578
This is an excellent battery so far. I put in my laptop battery slot and then let it stay plugged in for about 1-2 hours to let it fully charge before testing its functionality. The battery capacity is definitely higher than the original battery (my OEM one lasted 2.5 hours at most, the new one lasts about 4 hours!) One important tip: CHARGE IT TO FULL BEFORE YOU USE IT!, Also, shut down the computer COMPLETELY (no sleep or hibernate mode!) before you charge it! If you don't, it can damage the battery and lower its ability to hold the stored power. For those of you out there like me with a MSI GT70 2PC (Dominator-895 of course!), this battery WILL WORK with your computer perfectly! Also, make sure you buy a new charger, because the factory one is notorious for suddenly spiking in voltage, which can destroy the new battery pretty quick. All in all, this battery is a excellent replacement to the one from the factory, it is very decently priced, and it has a MUCH higher power capacity than the original! If you need a good battery, this is an excellent one to get!
3712281
This is the third battery I've ordered of this brand. Thus far all three have perfromed to specifications. With proper charging maintenance, I hope to get many years out this battery. The first one I ordered is about 2 3/4 years old and still holds its charge well. If you're looking for a solid extended life battery to replace the one that came with your camera...start here!
1682806
Holds up well against hours of web surfing, games and other apps. I was even able to use some Live wallpapers that drained the OEM batter in a matter of minutes before. this battery holds up well on standby time as well; something the OEM could rarely do. As a comparison, the OEM would be dead just from light use by 6PM. To be more specific, I turn the phone on around 8AM every morning and it sits on standby until 12PM when I check messages and email. Then its back on standby from 12 to 7PM when it would usually be on about 10%. With this battery, I can check messages, email and surf the web several times a day and by 7pm, I'm at 50%, so big difference! Definitely worth the money!
3937571
I have had this battery for three days now and, so far, it holds the charge very well. I go all day long with moderate usage with checking email all the time, listening to music, and watching YouTube.
My Note 4 is almost three years old and the original battery started giving up. I had to charge it several times a day, which is not a problem. However, the phone would spontaneously reboot when the battery level approached around 30%. Or I would have 30% battery left and then in minutes I would have zero!
I ordered this zero lemon battery and it gave my phone a new life. It is so great to gain back the confidence in my Note 4, which is still a very capable phone. I am so happy I do not have to replace it just yet. As I said, I had this new ZeroLemon battery for few days and let it discharged to 2% and it perform very well on the low percentages (the phone did not reboot  as it is with my original dying battery).
I will update my review after few months of usage. I hope that the battery continue to perform!
The seller has an additional 6 months warranty if you register for it. I did and now I have 12 months warranty.