I forgot them in my frig for 4 months and they still worked fine. If you search online there are tons of ...
589238
I used these for a science experiment with my class.  I forgot them in my frig for 4 months and they still worked fine.  If you search online there are tons of pics you can use to identify your cultures. It's amazing whats on your phone screen. This also helps the kids visualize why they need to wash their hand lol
1519435
Great price, they work good. Just takes a month to get them
4799993
My only problem with them is that they mysteriously disappear from my cabinet. I have to re-purchase them frequently. Maybe someone has the answer to this or has experienced similar problems?
4309703
Filters work well and the batteries worked great for 4 months but now I get an error code and they won't charge I can put old batteries in and reset it and the new batteries will work again for a couple days and then they will just all the sudden quit again
1979242
I had previously rated these 2/5 stars, which I've since deleted and am now posting better results. I've owned these since September 30, 2015. At first I thought these things were worthless garbage but I had learned that charging them with my laptop was not efficient. I've since then bought a usb 2.0 4-port hub and charge them through there. For being usb and rechargeable they're worth the money. I don't like having to spend so much money on packages of batteries just to have to swap them out a week later. I personally feel these do not hold the same charge as lithium batteries but when they die, I just pop em in the usb port and throw another set in. It has saved me my beer money and with that I am happy with what I've bought.
639451
I have owned several of these purchased years ago at a hardware store still have three of four functioning well after years of use, I believe they are dicontinued now and I have purchased several more on Amazon as back ups because they seem too be long lasting for a low price
4481730
I bought these four months ago they already do not hold a charge for more than a day I use them 7 days a week 1 hour a day I can't even get an hour even when I don't use them they don't hold a charge disappointed because I recommended these to a lot of people I would appreciate a refund or a new set or fix them so they last more than 4 months thank you for your time
4396035
They work perfectly fine, just wished that they would have been ddr4
1990849
I've been through about 4 of these already and they last on average about a year.
2906950
I bought a set of these back in Sep. 2014 and they are still working great on my main PS4 controller. You get 2 sets and they've lasted 5-6 months for me so far (still using the first set!) with minimal wear, I still would have liked to see them fit a little better over the thumbpad. About once a month I'll have to reset the covers to the center of my thumbstick as they seem to shift ever so slightly and very slowly over a long period of time and use, no major slipping or anything like that but it's still a hangup for me, hence the 4 star rating.
3646849
I had completely forgotten these existed, until my kids were talking about getting a slush when we stopped to buy gas. Once I recalled them the hunt was on. I thought these were a great price, and they work wonderfully well, just like I remembered. They don't hold a huge amount like I thought I remembered, but then again, I'm a lot bigger now! The drinks "slushed" quickly and my kids were delighted.
2105370
Well they are really good but the day i got them i lost them but they a as really good!
4639511
I've had no problems! I purchased these in December and they have done just fine! Well worth the cost!!! If u can be a tad patient with waiting a couple days to recieve ur part rather than picking it up in the store the same day at almost twice the cost, I'd say wait!
2839538
After I used them once they were done.. not to forget the 1 missing
2492391
I bought these for my 11 year old son whose into electronics and robotics. At this price I don't have to flinch when he accidentally miscalculates and burns one out, BUT when he went and tested them all 4 months after we'd bought them, none of the purple worked. :-/
4612314
I've had no issues with these breaks after 4 months, they never squeaked and work great.
2657188
They appear to be of good quality and fit firmly into HDMI socket. They have lasted over a year, and I am still storing the other one until the first breaks. I also have to move my equipment (unplug/replug HDMI and curl/store the wires) regularly and they still appear undamaged.