URGENEX 3.7V Lipo Battery 850mah Rechargeable Lipo with JST Plug for MJX X400 X400W Holy Stone X300C X400C X800 HS110 HS200 Syma X56W Sky Viper S670 V950hd S1750 V2450 RC Quadcopter Drone X5 Charger

Great Little Package for the price. cool, simple charger. DOES NOT FIT LaTrax Alias Drone without modification to the battery holder.

I previously stated that these batteries are unable to deliver 3 amps without dropping below 3 volts. I was wrong. The mating cables I was using in the test had excessive resistance. I don't know if they are really 25C, but URGENEX deserves 5 stars for their customer service. They refunded my money when I didn't even request a refund.

Great batteries

2 out of the 5 don’t charge. When they are charged, I get about 3-5 minutes with my stock alias quadcopter which they do NOT fit in. They are too wide. Super cheap though. Edit: I received a full refund and got to keep the working batteries after writing this review. Very good service!

This works with a Traxxas Alias Quadcopter. It’s thicker than the Traxxas battery, and is a tight fit. Plug is the mating end for the Alias interface plug, an adapter isn’t necessary. Once it slides into the bracket, it does have a tendency to want to stay at a slight angle. If you gently push from the front and guide it with a slight lift at the back, it falls into place. Removing is the process in reverse. I use a small popsicle stick to help push it out. First flight after charge was 20 minutes. I think this is worth the money.