Do not buy...battery lasted only 2 months
935729
Battery lasted all of 2 months. Of course the replacement battery only had a 1 month warranty on it. Very convenient.
4079823
I bought two of these and both of them stopped holding a charge and/or working within two months of use...  Even as inexpensive as they were they are not worth the money....
2235636
It worked great for the first two months. After that, it wouldn't stay on or even sync with my phone. I changed the battery following the manufacturer's directions, and still nothing. It's past the point of returning it, and I'm bummed there isn't any way to replace it.
3450695
The battery has a 3 year old date stamped on it and died after 2 hours of use. after fully charging it 4 times. I trashed it............
4637460
This battery did not last 2 months. I am truly disappointed.
235595
Only lasted a couple of months, then it was back to the same problems that i replaced the battery for. Didn't look new when i puchased it. It came in a envelope and thats all. Would not purchase this battery
460697
Don't buy this.  Battery failed and wouldn't hold a charge after only about 8 months.
487310
It worked well at first, but after three months the battery started to die and fail. It now barely lasts an hour. Despite a 2 year warranty, there has been no chance for replacing it and attempts to contact CWK have gone nowhere. Do NOT buy this battery if you want it to last.
4412173
Horrible! Purchased as a Christmas gift and started having problems within 2 months (After the return date, of course!) first the battery stopped charging, after the recommended hard reset it started charging again, however, now it is completely dead. Not even 6 months later it is basically a brick.
668384
I'm not a heavy phone user and this battery normally had 40% charge at the end of my day. Also I didn't have any issues with this battery overheating while charging, but after only 2 1/2 months of use the battery completely failed, the battery could not be charged at all. When I contacted company they refereed me to Amazon where Amazon said item return window had closed. I suggest finding a source that offers a longer warranty.
3162267
Worked great, for 2 months. Now it actually drains the batteries on our phones. Save your money & buy a namebrand one that will last longer than 2 months! It was convenient while it worked & the LED was pretty.
1364795
It stopped working less than 2 months ago so I replaced the battery with a high-quality Energizer battery in recommended size and it's already dead.  $70 spent now worthless.  Went to Garmin to see about repair or replacement and received the sorry buy a new one response.  I've also been having dead pixels on the display that seems to be growing in size so before long wouldn't be able to see the display anyways.  The fitness band has never been physically damaged.  I have used it per recommendations and now it's dead with a bad display.  I used to highly recommend this brand and particular fitness band because of its long battery life and versatility but disappointed in the long range quality after all.  It is not built for long term use even with replacable battery.
1093708
Less than 2 months old and won't hold a charge. Deserves no stars at all
4349325
Please don't buy. Battery didn't even last for 4 months .It simply failed and stopped charging!
3023920
Got the battery less than 3 months ago, and it's already dead.  I'll definitely be trying a different brand.
1414989
I bought this device about 2-3 months ago, I barely used this device, first the voice is very low, the battery stopped charging and now it is completely shut down and it won't even start again. do not buy this product.
3586921
It works well at first. But the battery died after 2 months.

I brought it for playing pokemon go about 3 month ago. At first it works really well. I bring it to Santa Monica Pier and I can play for hours. It's a little big, but that means more power!

After 2 month, the battery just won't last. I charged it for a whole night and it showed fully charged, but after 20 minutes charging my iphone the indicator shows no batteries left.

Don't know where all the 5 star reviews come from. Based on my own experience, I wouldn't recommend it.