3.7V 500mAh Lithium Battery with Charging Protection Genuine Parts for UDI U818A RC Quadcopter

The battery works well and is the exact same one that came with my UDI U818A Quadcopter. The battery has charge protection and doesn't overcharge. The LED light on your adapter will glow green when charging is complete. I'd say they take about 2 hrs to fully charge. When flying my U818, the battery gives me about 7-10 mins of flight time depending on which functions I am using (lights, camera, mode 2, etc.) These are definetly worth it if you own a U818 or a similar drone that's compatible with a 3.7v 500mAh batt. I bought a few of these batteries and have charged them multiple times with no issues (no swelling, don't heat up when charging). They also seem to charge fine when I charge a few of them at once with my 1 to 5 adapter.

Great replacement battery

The battery is functional. It however is not the original one that came with the drone it also looks nothing like the picture. The shipping was fast though and came before it was supposed to. It is very cheap and was made in china

Shipped fast. I charged all the batteries and they all work great.Ive been flying my drone with just the one battery it came with for several months, and the fun always ends too soon.After I charged my new batteries, I took it out for a test and flew my drone for 40 minutes non stop.Note that some reviewers noticed the engines were extra hot after flying for a long time. I was flying in the cold so I didn't notice any problems. We'll see what happens in the summer.They're a tiny bit wider than the original battery so they actually fit better.Steer clear of the multi charger, the reviews are terrible. Sure, you have to charge one battery at a time this way, but they all work with the smart charger so you won't ruin your batteries by leaving them plugged in.At this price, this purchase was a score.

These battery's work great with my UDI u818a quadcopter. I get just as much flying time with these as I do with the original battery that came with it. Compatability was perfect and I have had no problems so far. I would recommend these to anyone looking for an extra or replacement battery for the u818a.

does battery suck it never work and they don't want to send me another one

bought this for my u197a quad copter, Fits the plug and holder on the UFO perfect, My smart charger says it only holds 460 or so ma capacity though, falling shy of the advertised 500, but that is also about what the stock battery holds too, so I figure they were both just older battery's and still a decent value for the price.

It fit my quad just fine, now I can fly over and over. With all that flight time, I'm sure to get it stuck in a tree!