4-Pack of E-flite 3.7 Volt 150mAh 25C Lipos for Blade mCX mCX2 mSR mSR X Nano QX Nano CPX UMX AS3Xtra

You'll want some extra batteries to extend your time at the flying field. The HobbyZone Sport Cub S only comes with 2 batteries, so getting an extra 4 means you can fly six flights instead of two. Why only 3 stars? One of the four batteries had some sort of imprecise dimension on the connector, such that it would not stay plugged into the aircraft receptor. They were not expensive enough for me to go through the effort to try an get a replacement, but since I only got 3 out of 4 workable batteries I can't really rate them as 4-5 stars. So if you have a local hobby store that carries them for the same price you might consider getting them there since they would be easier to return.

had to "mothball" the drone when I got these and a replacement set of blades thanks to the motors going out and under preforming, so i didn't get a solid test out of them.

I would have given this 5 stars but one of the four batteries was bad. After charging it the second time, the battery swelled and I know this means stop using it. But the other three have been charged multiple times and have worked great. I would say they are equivalent to the original battery (of course same manufacturer and part number).

Had trouble at first with all of these as they would not fit the plug. Thought the batteries were defective as none would plug in properly and the battery that came with the plane worked fine. Turned out that the two tiny contacts in the plug were bent upward and needed adjustment. Once I did that the batteries fit properly. Check this first if the batteries don't seem to fit correctly.

Good value for small batteries. I can keep my Blade Nano in the air for nearly as long as I want to. Would recommend purchasing the E-flite Celectra (4-port 1-cell, 3.7V, 0.3A DC) LiPo Charger which allows you to charge 4 of these at a time.

One of the four batteries I received has a damaged connector and doesn't clip securely, causing it to fall out of the quadcopter during flight. The other three connect fine. None of these fit very well into my BLADE Nano QX... The foil on the sides is a bit wide and tends to snag on the housing when trying to install the battery. Also, they don't fit snug and tend to slowly slide out towards the rear of the copter, putting it off balance.

These batteries only last 4-5 minutes in most planes, so it's a great idea to have stock of some fully charged extras. That will take your flying session from a few minutes to an hour.

Nice item with good quality, as described.