sea jump 2PCS 7.4V 2700mAh 10C Battery for Hubsan H501S X4 H501C H501A H501M H501S W H501S pro Four-axis Aircraft Aerial Camera UAV Spare Parts

Works fine

Exact replacements for some very old batteries. Fast delivery.

Batteries work great. They are a tighter fit than the battery that is sold with the Hubsan H502 but not an issue. Just a tighter fit.For those who don't know, the connectors on these batteries and the Hubsan H502 are called EC2 connectors. They work fine and are very rugged. However I switched mine over to a more useable XT-30 connector. The XT-30 connectors can be soldered and de-soldered as a person needs. With the EC2's you have to cut off the blue plastic, then when refitting new connectors the metal barrel plugs have to be heated really, really high and slid into the blue housing...again making the blue plastic a one time use.

Maintain a long charge time.

I have not been really careful about proper battery charging, maintenance and storage so this is my 3rd set in just over a year. Luckily, Amazon keeps these around, even though they seem a little expensive. These batteries have been identical to the ones that came with my drone, The Hubsan H501S

Have ordered these in the past and they work great.

These worked fine for about a month and then one battery started to bulge so much that it wouldn't fit in the drone. Threw it away. The other battery is still going strong so far. I suppose it's a toss up. I'd probably check around before buying this one again.

The Hubsan battery compartment is exactly the same size as the battery so fit is critical and it is a perfect fit.