Rated 3.0 out of 5 by 23
Rated 3.0 out of 5.0 by ToolboyNC Rayovac Phone Boost Keychain Charger - Just OK
I've had no problems with any of my Rayovac Phone Boost Keychain Chargers. I purchased several of these when HD discounted them to $4 in 2014 and gave one to my wife, one to each of my kids, and I put a couple in my truck. It's very easy to keep them at a full charge, since I've put multi-port USB chargers in the cigarette lighters of our vehicles. Keep one in your pocket or purse, and exchange with one in the dash after use. This is especially handy for the kids with their iPod Touch which always seem to be running low when we're on our way to an appointment where they'll be sitting around waiting.
Another reviewer complained that they hold their charge for only 12 hours, but this is false. They must have received a defective unit. All of my units can hold their charge for months.
The unit separates into 4 pieces, but I find that it doesn't come apart when all clicked together. And if you just need the 30-pin plug, you can leave one piece in your vehicle to make the unit a little smaller. I like the fact that this is so small, and no cables are required for use.
While the booster works fine, I can't give a full five stars because there's not a lot of energy in one of these, and the discharge rate is limited to about 500mA. That's fast enough to power or trickle charge any small device, but it's hardly enough to both power AND charge a small device at the same time. (OK, maybe a small single core device like an older iPod Touch.)
This booster is not effective for a tablet. It could be used to trickle charge one while the unit is powered off, and you might increase the battery level by 10%-ish. But forget running the tablet from this thing. About the best you could expect would be to slow the main battery's discharge rate for several minutes.
A lightning adapter can be purchased (but not at The Home Depot) to make this unit compatible with a newer iPhone 5/6.
January 29, 2015
Rated 2.0 out of 5.0 by aintgert Meh
It holds a charge for only 12 hours. This means you must plug it in every 12 hours, so that it is ready in case you need it, right? Plus, it has so many little parts with no way of storing them when are using the ones you need. The little writing is impossible to see, and I had to go to the internet to figure it out because it came with no instructions. It provides so little charge for all the work, not really worth it. The only thing I will give it is that it is light enough to carry around. I guess for the price, you might like it, but I just don't think its worth all the hassle for about an hour of charge. Sorry
June 5, 2014
Rated 5.0 out of 5.0 by Whateverman Charge it up first and a few other tips
Yes, you must charge it up AND keep it charged every 12 months or so. (Not every 12 hours like mentioned elsewhere). Once a year. Not every day.
It's smart to test it out before you need it so you know how to make it work! A recent test I did after leaving it charged and stored for months gave me a decent jolt of juice and was certainly enough to make an emergency call or two.
Finally, when it comes to the switch, here's the trick: move the switch in the direction you want power to flow.
Move it towards the device side aka "Out" when you want power to flow OUT to your phone/device.
Move the switch towards the USB end aka "In/Off" when you want to power flow IN to the unit #to re-charge it once it's been used#.
Leave the switch towards In/Off when stored. But don't forget to slide it back to "Out" when you need to use it.
July 12, 2014
Rated 1.0 out of 5.0 by RMoorefishing Cell phone charger
I don't have anything bad to say about the product at this time because it doesn't work with the new iPhones. I need to return it & get one that will work with the iPhone 5s.
July 16, 2014
Rated 1.0 out of 5.0 by alsdiyer not worth it
didnt charge my phone at all. Charge light came on, phone noticed the charge, but it was a slow to none trickle and stopped charging within minutes. Tried it out on my daughter's non-smart phone thinking my phone was just too much, no such luck. This one went back to the store for a refund. I had higher hopes for rayovac.
June 30, 2014
Rated 5.0 out of 5.0 by TomNYC Great for 1 Hour Emergency Power
Great for emergency. Provides enough power for around 1 hour talk time.
Very portable (around the size of a car fob remote) and self-contained (no extra cord/plug/adapter required for my iPhone 4), so I keep it on my keychain. And it's only around $12.
As I said, it's great for emergency use to provide around 1 extra hour of talk time. So, if you need more power (e.g., enough power to fully charge up your phone), you'll have to get a larger, more expensive, and usually NOT self-contained (extra cord/plug/adapter required) backup battery charger.
The simple instructions are on the box: (1) put the switch on "in" when you're charging the unit through its USB plug, and when the light turns green it's fully charged, and (2) put the switch on "out" when you're using the unit through its phone plug to charge or power your phone.
November 25, 2013
Rated 1.0 out of 5.0 by jalonna not happy
It broke the first day that I got it. The switch broke so I couldn't use it. :
April 21, 2014
Rated 5.0 out of 5.0 by Butch It's more in store that meets the eye.
I've had this unit for a month now, and it saved me the frustration's of missing or placing a call when the battery is about to go dead, so I just plug this unit into by Droid and within minuets, I was back on line, I carry it wherever I go now, in the Television/Broadcasting world, I'm not always near an electrical outlet to charge my smart phone.
November 20, 2012