Wild Scorpion 5pcs/lot 3.7v 240mAh 30C LiPo Battery for Syma S105 S107G S108 Mini Helicopter

I bought these batteries to replace aged cells in otherwise well functioning micro-helicopters (Syma S107G and S026G). These are rated at 30C which is total nonsense due to the extremely small gauged wire they come with. Basically after I soldered the batteries in, the RC helis run good for 10 seconds and then slowly die as the wire heats up. I confirmed my suspicion by completely removing the included smaller wire and attaching larger gauged wire (like what came on the Symas originally), things worked much better.This is risky business because you have to partially peel back all the battery insulation at the terminals and fiddle with the fragile positive and negative tabs.If you have a low amperage load, these might function well (like the 5 star reviewer said with dog bark collar). But, these were specifically advertised for Syma, of which they failed at.

I'm on my third pair of dog bark collars(vibration only). They make these collars so that you can't replace the battery and are forced buy them again. Well this time I decided to take the bark collar apart and found a battery hidden behind the circuit board that is very similar to this one. This battery is almost a perfect match (30Lx20Wx7.2mm Thick). My original battery is 5.5mm thick but I was able to make it work with a little modification to the collars. Now they work perfecly again. My only regret is that I didn't think try to fix the collars before.I'm really happy with this purchase, they arrived quickly, and saved me a lot of money.Thank you.

I am not a big review writer, but I felt compelled to leave some feedback on these batteries. IME, these batteries are a POS. You have to install a battery connector if these aren't directly soldered into your application, so be prepared for that. I did that install for two of the five batteries I received. I then gave the batteries a gentle 250mA CCCV charge on a SkyRC IMAX B6 charger. I then checked the internal resistance. One measured 303 mOhms and the other was 338 mOhms! I would expect to see something close to 100 for brand new, never used batteries. I then tried these in a Hubsan H107L quadcopter. All I did was hover at about 6' height. One battery lasted 14 seconds and the other lasted 8 seconds before the copter drifted to the ground.My advice is do not waste money or time on these batteries! I wish I'd have tried these out sooner. I waited too long and now I am beyond my window for return. So they were a waste of money for me. YMMV.

Unfortunately these didn't work straight out of the package. I ordered them for my Eachine 010S and soldered losi connections on but they didn't get the quad off the ground, and all of them were the same way unfortunately. They were also a slimmer thickness than my original Eachine 240mah 45c. I even checked cell voltage using my venom duel channel charger and they would lose power in less than 10 seconds from 4.2 to 3.8

We've soldered these replacement batteries into 2 older syma 107and 107g helicopters who's batteries had failed (after years of solid service). The new batteries are barely powerful enough to get the "fixed" helicoptors off the ground, and only for a minute or two. On top of that the batteries are so much bigger that they aren't a good fit (which I could live with if they worked). From my perspective these are not good battery replacements for syma 107 and 107g because they're a poor fit and don't seem to work well.

Great deal. Actually the mAh received was 270. These work very well. You just need to put a little more time into balancing the helicopter with a slightly heavier battery. They need to be pushed back in the cockpit toward the gear area area to fly correctly. Thrust is excellent and no problems flying.

These batteries are slightly larger than the original heli battery and do not fit well. Had to cut the center of the canopy open to use them. Re-ordered the smaller "original size" batteries for future use. Beware.

Used in a keyless fob and on the second charge, the battery swelled to almost bursting!I will try one of the remaining four and hope to find a safe and reliable battery.