ENGPOW 3.7v 250mah Lipo Battery for GBlife Bounce Car Holy Stone HS177 FQ777 FQ17W Wonder RC Chopper Eachine E55 JJRC H22 GoolRC Mini RC Drone Quadcopte with X4 Charger

I don't get any of the negative reviews. These fit just fine in the hs177. They are a tight fit but they are supposed to be. If they are loose, they move around and screw up the balance so you have to keep trimming. I did notice on a couple of mine that the company logo sticker was on the OUTSIDE of the shrink wrap instead of inside it. Just that little bit makes it catch when you are trying to insert them. If yours are like that, just peel the dang sticker off. They last at least as long as the original batteries and the charger works great. I bought a second set and am going to be buying a third one here shortly. They are cheap. All of the stuff this size is cheap.

These batteries do not fit my HS177 drone. They are too wide to fit into the slot. Other than that they appear to be good batteries. The hub works and so do all 4 batteries. Took away one star for the misinformation.

These are great little batteries for my battle drones. Charger works great. Couldn't be happier with my purchase. Sure is nice to have extra batteries when you want to keep playing.

As I stated I thought after researching other places this was the best price for me. Battery life was great with proper air speed.

These were a return judging by the label, polarity was reverse which I caught too late. Sparks flew when I was removing the battery. Now I am bleeding. I won't be using these, they ruined the drone but the batteries aren't ruined.

These seem to work great, I have had no problems with them or the charger. I will be buying some more. The price was great and the shipping was fast.

I bought these to replace the 3.7V 250mAh HMXP1009 "Heli-Max" LiPo battery for a Heli-Max 1SQ drone. Plugged one of the batteries into the drone and instant fireworks... the drone is toast. Fortunately, I got it unplugged before it burned anything but the board on the drone. Comparison to the Heli-Max battery shows that the polarity at the plugs on these are reversed. Yeah, I should have checked that. What I received matches the polarity shown in the pictures for these batteries, so double check before ordering.

Works well. Haven’t tested mAH but seems to provide good flight time on XK K100 during use. Super tight fit, but with force you can make it fit into battery carrier.