2-year update: Put it away for six months, and now the battery won't take a charge.
357710
Placing battery on charger, I got a green flashing light on the charger and a red flashing light on the battery. I called warranty service at EGO and left a message. They called back the next business day and after a description of the issue, said they'd send a replacement battery. Otherwise the trimmer had been flawless. Given the responsiveness at customer service, I'll pick up a second battery and stay with them.
3054533
It worked wonderfully until it needed it's first change, a little less than two months after purchase (which is a really long time, I admit!!). Sadly, it won't take a charge now. Completely unresponsive to apple certified charger that came with the mouse. And I have missed the return/exchange window. Looks like I'm stuck with a lemon.
1177571
Update: After the company reached out and sent me a replacement, I have upgraded this review to 3 stars. If the replacement battery is still going strong 6 months from now, I'll upgrade to 5 stars and assume my original battery was a fluke.

Original: Bought this battery 5 months ago.  It worked great at first and I was getting almost 2 hours per charge.  Now, about 28 uses later, it only runs for about 30 minutes.
225130
This battery worked well... for 6 months, at which point it swelled up so much, that it made it impossible to put the cover on.
Good: plenty of juice - on the days I forgot to charge, it carried me through the next day without an issue.
Bad: plastic cover is flimsy and ugly. Easy to snap off. Failed after 6 months.
648050
This battery has held up for about 6 months (perhaps 200 cycles) and it is now discharging at an insane rate. I took the battery out of my phone for a day or so to stop it from discharging. I put it back into my phone and it has lost 10% of battery life. This battery worked really well right out of the gate, but as for longevity, it just isn't there. I can use it for maybe 6 hours or so before I need to recharge (100% to 20%).

UPDATE:
The company is sending me a new battery (thanks RAVPower!) so we'll see how this goes!
4171978
I purchased this item in January of 2014 and for the first couple months it worked fine--held a charge, powered my MacBook for a couple hours, etc.  I should have paid more attention to the previous reviews saying a similar thing to what I'm saying now: It works for a few months and then you're lucky to get 30 minutes off a full charge and it looses charge fast enough that it goes from a full charge to nearly or totally dead in my bag overnight.

I'm more worried about this battery because it has started to bulge and the removal tab has broken off.

I think that Anker's battery chemistry and quality control is seriously flawed.

I guess the old adage of "the most expensive tool is the one you buy twice" is correct.
1749678
I was looking for a replacement battery for my asus eee netbook since the original battery was completely dead and held no charge what so ever. I bought this one and as expected, it fits the netbook and worked well...for a while.
I bought this in october 2014, its now april 2015 and when the battery reaches about 40% (im using windows 7 starter due to the latest events with windows xp) the pc shuts down. When i reboot, the battery is shown as it has reached 0% charge. Is this battery showing symptoms of dying out after 6 months of use? I think thats a bit soon.
1653604
With battery technology improving, I was surprised how quickly this phone's internal battery time declined over only six months.  The first three months it lasted all day and night under typical use.  Now, at 6 months, I can barely get to the end if the day before the low battery notice comes on and it soon dies.  Keep in mind that I usually just have it in my pocket all day, little phone use, and maybe a few texts, nor am I watching videos or web browsing much.  I also am connected via wi-fi at work all day.  One other negative, the phone just had some dead pixels come up on the screen.  Hopefully, since it has only beeb 6 months, I can still at least get that fixed.  It might seem minor, but if you use this phone with VR, everything is super magnified.
4700060
I used this about a dozen times, put it on my shelf and came back 6 months later and the battery swelled and popped the screen off... wtf!?
3696144
Updated 7/27/2018
After a meager 2 years, the battery won't hold a charge for more than  20 minutes.  Naturally, I contacted Sena Customer Service at 2 years and 2 months. After 2 weeks of email exchanges, they told me it was out of warranty (which I already knew and stated so in my original email to them).  The best they could do is give me some battery information in an attempt to allow me to buy new batteries (it takes 2 different types), but they 'weren't allowed' to give me enough info so that I could actually find them online.

Even if the battery issue was resolved, I have to say that much of the User Interface and is in need of work. The buttons are hard to find with gloves. The jog dial is clunky to use for anything other than basic volume. No Push to Talk capability at all (greatly desired when riding in a group and using the bike to bike feature).

The net after 2 years is this thing is just not worth the money IMHO.  I spoke to a few dealers about some of my issues. By an large they all agree that the reliability of Sena devices isn't as good as other vendors. Certainly a 2 year shelf life is pretty awful for a device costing this much.

Original post

So far works very well. Have used it with both a phone (Samsung Galaxy S5) for music and telecommunications and a nav system. For nav, I'd used both a Garmin Zumo and a tablet (Samsung Galaxy Tab S2) running Copilot. The phone and Zumo paired right away. I did need to watch t he YouTube video to get the tablet to pair as a 2nd phone. But once I watched it, it was very easy.

Not a big fan of the speakers. I use and recommend good isolation ear buds instead. It is great that this unit is already set up for them. They'll actually protect you hearing. If not, use earplugs, but if you do, the speakers really aren't likely to sound very good. They aren't that great without earplugs.

The ambient mode is a great feature, but as others have reported, it could use some tuning. I find the button on the bottom that's used t I enable it is hard to find with gloves.

Bluetooth sound quality is very good. I haven't tried bike to bike yet, but looking forward to hopefully no longer needing a two way radio. Not have I tried the FM radio.

I expected wind noise but I really don t notice it.

4 1/2 stars
2397516
Worked fine for a couple of months. It will no longer take a charge.
575416
Fits my HP Pavilion dv6 perfect. Holding a charge great for 2 months now.

#1 UPDATE: Jan 20 2015 The battery is no longer holding a charge at all. If I unplug the laptop it shuts off. I put my old battery in and it works normally when unplugged. I have not heard back from the seller(wondermart) about a replacement. Will update when I see how the 18 month warranty is handled. I have used this battery for only 2 months and a week.

#2 UPDATE:1/26/2015 I have lowered my review to 1 star as the seller wondermart did not honor the 18 month warranty but Amazon gave me a full refund to a gift card. Very disappointed in this item and seller.
1343981
After 2 months it won't hold a charge anymore. I replaced it in June and now it won't go above 20%.
4666776
As of October 29, 2017 (2 years and 6 months after installation), this battery no longer holds a charge.  Good while it lasted, but know that when the capacity reaches it's end date, the battery performance plummets to 0.
440978
Worked great at first. The biggest issue I had with it was that the connectivity would sometimes drop out. But outside of that i really liked it. Unfortunately. the battery only lasted 2 months. The battery seems easily replaceable, but I'll have to buy a new one and hope that it is the battery and not something else.

Update: replaced the battery with A highly rated one. Battery didn't last more than a few months again. My guess is charging circuit isn't quite right and it may be overheating them. Threw it in the trash after 5 months.
1404913
5 months of use and battery is already dead. Can't charge it any more.
How do I claim for 24-months of warranty being advertise?
1186190
The battery worked fine for 2 months. Then it stopped working. It will not charge back up. The seller has corrected the issue and is sending a replacement battery.

Update: unfortunately the same thing happened with the replacement battery, so I am changing my review until I receive one that works.