Cheap battery Cheap life
583935
Simply just didn't last. Cheap battery that doesn't last. But that is what you would expect from this battery. It only lasted about 4 months then it kicked it.  It holds a charge for about 3 hrs, even though it says 4.
2842864
It works intermittently.  I wouldn't buy it again.  The battery life is weak.  I guess I got what I paid for.
1072499
Battery life seems to be mediocre at best, over priced for what it comes with.
1538949
They feel a little cheap, but they've worked well for about a year of use (approximately once a week). The battery life is the only weak point I've found, but it generally lasts at least 4 hours of use.
845085
This battery is no better than the 2 year old worn out one that I was trying to replace.  My phone NEVER gets used, it just sits idle in my pocket, and yet with this battery I need to plug in every couple hours or it dies.  Nowhere near the original battery life
2749143
Cheap.  If you live near the Equator then it will work fine for 5 hours of darkness. The battery storage is weak and it throws limited light even when charged up.  Use it for an evening garden party to get a few hours of light for ambiance.
2871846
Battery lasts about 2 hours. Control buttons are clunky and pull on your ear. Sound quality is decent but battery dies redicuously fast if your over a quarter volume on my S8.
4973345
PROS:

- Comfortable
- Cheap

CONS:

- They get micro disconections like every minute (EXTREMELY ANNOYING)
- Reach is not even 5 meters, you have to use it close to the phone (USELESS)
- Poor battery duration comparing to others
4317624
Like everyone else, I was tempted to get this cheap battery pack for my Canon. It seemed too good to be true at the price. However, after 3-4 full charges the battery literally died. It doesn't retain the charge anymore. I still have my 6 years old OEM battery pack which hold a charge for about 300 RAW photos.

If you don't want to buy batteries every month or two, get the OEM.
2735942
I received the battery in good time and was very excited to have a brand new battery for my phone.  Much to my dismay, this battery was no better than the old one it replaced.  I left it charging for a couple of days so it would have plenty of "juice".  Now that I started using it, I can only get a couple of hours of talk time before it goes dead.  I guess the old saying still holds true:  You get what you pay for.
1524212
Great price but the battery life on it absolutely sucks and the sound isn't even that loud, I wouldn't recommend getting this unless you like watching red and green lights flash while it charges or not hearing it that good. Only good thing was it shipped early
1727268
Well, finally time to come back and write a review on this battery. I am not impressed. I have had it for about six months and it's starting to go. It started to get noticeably shorter life after about five months of use, and now it goes pretty quickly, after about half an hour to 45 minutes. I expected to get more time out of it, especially as it wasn't one of the super cheap batteries out there. A laptop battery should last 300 to 400 charges. For me, that should be about a year.
3777447
Battery life is not great, even on the blink setting.  The unit dies on 3-hour rides, even while my front light still works.
2674845
Its functional. Its cheap.  The buttons and keys are just absolute garbage. You have to hit the right spot on the mouse buttons or it won't click just (flex/wobble).  I chose this one over slightly more expensive ones because of the exceptional battery life.  I mean a year and a half is astounding when some rechargeables last a couple hours.  However, it seems Ill be buying twice... There seems to be a big gap in the market in quality and price.
1943075
It's decent for the price you pay, if you are fussy about the sound quality....then don't buy this. The battery life isn't 8 - 10 hours.
3808271
Pros: cheap, light, decent battery life
Cons: cheap casing that will break easily, no option playlists, bad video quality. If you pause a song and turn off the device and then later wish you go back to listening it it won't let you continue where you left off. Rather it will stay your songs from the beginning
1206937
Battery only charged up to about 55%. Died fast.  Only giving it 2 stars because it actually works and was cheap.