Everlasting Glow AAA Battery Convertor Christmas, 5InL x 2InW x 7.5InH, Black

I bought this thing because my "smart door lock" uses 4 AAA batteries and I was tired of always changing them out. At least once a month, using it only 2 to 4 times a day to lock / unlock the front door seems a bit much to have to keep replacing the batteries.I first turned to the obvious... rechargeable. With those, I wasn't buying batteries as often, but I had to replace them more often. And with conventional rechargeable, I was basically only getting 1.2V per battery anyway (4.8v total vs 6v on alkaline), so 4.5v seemed it should reasonably work for this application.When I plugged this thing in with all the supplied pieces, nothing happened. What???----Well... this thing comes with 1 x 4.5v AAA battery adapter with thin-ribbon wiring, and 3 dummy batteries. The 3 dummy batteries are basically just a wire running from terminal to terminal, slightly spring loaded from the tension in the wire, like a glorified paper clip. You would think you couldn't screw that up. I was wrong. I ran a multi-meter to check the voltage on the adapter, then the short in each one... and sure enough, one of them did not short!!! I was tempted to return it there and then, just for that. But I didn't.With the supplied materials fixed, it was okay... barely. That's when I figured I would have the ingenious idea of replacing one of the dummy batteries with a rechargeable. Better. So if 1 is good, then 3 is better right? haha. Why not use 0 dummies, 3 rechargeable, and the power adapter? I decided to test that, so in theory, the normally 6v battery compartment would be using 4.5v 1A of adapter power and 3 x 1.2v rechargeable (giving me a theoretical 8.1v total).I'm an utter genius. The extra 2 volts really made the motor work like you would expect a door lock to run. And since this thing doesn't run constantly, like lights or something like that, I shouldn't expect a fire hazard to build up in the wiring. Better still, every time I lock and unlock the door, it would theoretically also trickle-charge the rechargeables...I'll update this review if my door catches fire, but I really don't think that'll happen. So I'm keeping it, all things considered. But truth is, with the poor construction, I would buy the other one (which is also cheaper) if I had to do it all over again.

Great not to have to keep buying replacement batteries!!! I have been using this item for over 2 years now. I discovered it at a local store near me but it is cheaper on Amazon. This item is GREAT for my battery operated flameless candles. If you are buying this for larger items like a kitchen clock etc, I can't say if it will work however its great for small battery operated items. A real money saver. I have had this item in a flameless candle for over TWO years now and it STILL works well inside of the same flameless candle and I am very happy thinking about all the money I saved from not having to buy batteries!!!!

It's a bit odd they supply you with three AAA blanks. You only need two, though I suppose it's good to have a spare in case you lose one.Main thing to know. AAA batteries are 1.5v. When you use any adapter like this to replace real batteries, you look at what's in the device and add up the voltage. We needed three AAA's, which is 4.5v (1.5 x 3).This means the adapter is only meant for a device that uses three AAA batteries.If you use only the wired battery in a device that uses one regular AAA battery, you will be feeding it 4.5v when it's expecting 1.5v. In other words, you'll burn out the device. If you use all four (the wired and all three blanks), it's still only going to put out a total of 4.5v when that device is expecting 6v. Putting in all three blanks can't make a 4.5v adapter magically output 6v.Used correctly with three batteries (wired and two blanks), it's great. Used incorrectly (1, 2 or 4 "batteries"), and you can ruin the device you're running with this adapter.

Perfect for not buying batteries forever

I was so happy to find this. I recently bought a Wookie life globe that took 3 AAA batteries and it would burn through them fairly quickly. This now powers it up beautifully and keeps it going strong to show off its awesome effects of strobing lights all day long! I comes with the powered battery and 4 dummy batteries and it will adjust to the needed voltage to work great. Doesn't heat up or anything. I definitely will be getting more for my battery powered items to save a lot on batteries.

This is the best invention! Great to have on hand to replace batteries needed in holiday decorations.

Let me start with saying there is nothing wrong with this item, I received it in good condition & it does work. The issues is in what I got it for - and I wanted to share that.I got this to convert a garage car parking aid to A/C because it goes through batteries very quickly. The parking aid I bought at H.D., and it uses 4 AA batteries.I also bought AAA to AA battery covers to use with this.Unfortunately, for my purposes, it provides barely enough power to turn on the device, but it's low enough power that the device keeps signaling a low battery state - the result is the unit flashes almost constantly. So I'm off in search of another solution.

I used several of these battery converters at Christmas to cut down on the amount of regular aaa and AA batteries I was using for displays and LED pictures. Most of the pictures worked well. Some, though, began to fade one by one. The little led lights actually turned brown and stopped working altogether. I tried to put back the regular batteries, but the lights had burned out. I'm guessing the power output from the converters is a little too high.