Battery only lasts 2 weeks
932381
Really disappointed. Loved the look of this fitness tracker, loved how it automatically tracks my steps and sleep, love that it can detect and record when I'm doing a run or a workout...but after only 2 weeks, the battery is dead. This means I need to take it to a jeweler to have the battery changed...will be returning, because I don't have the time to get my watch battery replaced every two weeks!!!
1777626
Updates are added to the post:

I only had it for two days so far but already can say it works much better (longer battery life time) than the original battery that came with the phone.
Problem: the two little connector on the actual charger are so flimsy that I feel they will break very soon. After keeping it in charge for more than 12 hours, the light was still on. There was no instruction saying that the light will go off when the charge is completed or not. When I put it in the phone, the charge was only half way done.

2 weeks after and updated review: I have the product for 2 weeks and I am still happy with the battery if charged in the phone using the phone charger, still unhappy with the wall charger that comes with it, and very disappointed at the duration that the second battery actually holds power. Don't count on the second battery as a back up, it doesn't hold the power to be used as a backup if not charged within 24 hours.

Update:More than 2 months later:  Batteries are awesome- Charger is not working and I am about to toss it out.
***********With all that said: with this price, and having 2 perfectly working batteries---I can live without the wall charger. I still recommend this to everyone;
2530443
Installed this product and a new battery in my phone and within two weeks the phone died. I was having no issues before installing this besides that the battery would die quickly
42526
The boat goes really fast and it was a lot of fun. After the first time my son used it I considered buying a second boat. However, the battery only lasted 2 recharges before it died. This boat was a birthday gift for my son and it worked for less than two weeks. It was a huge disappointment.
1050181
It didn't last but about 2 weeks and the range dropped to about 20 feet.
3242622
After about using them for 2 weeks the batteries will no longer charge.
511685
Too much has to be spent on batteries!

This product, Petsafe Dog Training Collar, worked great for about two weeks. We started having problems and could not decide if we wanted to spend more money on new batteries to see if that was the issue. Decided to put the money into the batteries and it started working again. But, it only lasted two more weeks. We called the company that produces the collar and were told that the batteries will only last for two weeks. That means that for this collar to work well, we will have to spend $78.00 every year in batteries. Had we known that, we would not have purchased this item.
1884223
The batteries don't last long. They only last for like 2 days.
3127949
It worked very well for 2 weeks than the battery stared draining very fast. Not holding power.
3818152
So excited to find a replace, so sad it only worked for 2 weeks.
4142185
The battery was great for the first 2 weeks but since then, it has been slowly deteriorating. By now, I barely get a full day on the battery, when I was getting almost 2 days at the beginning.
539605
Pros: Has good battery life.
Cons: Worked for about 2 weeks and then died. Didn't charge any more,  didn't turn on.. nothing.

I had really high hopes for this product but was really let down!!
1624006
It worked great for about two weeks.  It was bright but didn't last more than an hour with a full charge.  Then it stopped working after 2 weeks.  Almost bought another because initial impressions were pretty good.  Even though it only stayed on for about one hour, it was bright.  Now it doesn't even turn on.
3122911
The battery is supposed to last 6-12 months. For us, the first full charge lasted 1 month, 2nd one just 2 weeks, and from there on only a week! We are returning it. Waste of money!
4901877
It work for 2 weeks only after that I have continue charging at least 3 times a day. Waisted of money
2652551
I charged it once, it worked for 2 weeks, and when I charged it again it did not work. I think the battery inside is faulty.
1152314
It has stopped working already & I've only had it for 2 weeks.  :(