Easy 7 Step Syma S107 Battery Replacement Instructions
The Syma S107 battery replacement is easy to do. Even so, many people are afraid to attempt it because they are worried about damaging something. To make it easier, I’m going to demonstrate the exact steps you need to take in order to replace the battery. Hopefully this will give you the confidence you need to tackle this project and get more use out of your Syma S107. Before we get into the specific steps, here’s some background…
Why replace the battery?
There are only a couple of reasons to change the battery in an S107.
- The battery is not holding its charge as long as it used to. The symptoms of this might be short flight time (less than 2min), inability to fly very high, or taking too long to charge (more than 1hr)
- You want to get better flight and performance compared to the stock Syma S107 battery.
Selecting a replacement battery
Once you decide to replace your s107 battery, the next thing you’ll need to do is select your battery.
Obviously, the safest approach is to drop in a direct replacement for the original battery to ensure that everything is compatible. To do this you’ll need to find a battery with equivalent specs to the S107 battery. Click here to buy a stock replacement battery with equivalent specs online.
If your goal is to improve flight time over and above the original S107 battery, you’ll need to find a 3.7V lipo with significantly more than 150mAh capacity. The trick is, you need something that doesn’t weigh much more than the original battery (3.9g). If it weighs too much, it’s going to be difficult to keep the helicopter balanced without adding weight to the tail. If you start going down this slippery slope, any gain in battery capacity could be outweighed by the extra weight of the battery. If you want to give it a try, check out this 5.6g 240mAH battery.
Update: I have purchased both of the batteries above with excellent results. In fact, I was able to achieve much better flight times with both of the above batteries compared to how it performed out of the box. To put it into perspective, I did some time trials by charging the battery then hovering the heli until the battery could no longer hold it at about 4 feet. I stopped the timer as soon as it dropped below that at full throttle. The Results?
- Stock 150mAH Battery: 8 Minutes 17 Seconds
- 240mAH Battery: 9 Minutes 51 Seconds.
I also want to make it clear that there are NO compatibility issues with the batteries specified above. There have been comments and emails to indicate that the upgraded battery will not work with the S107. These claims are false. I have verified the circuits both in the charger and on the battery. My 240mAH battery has gone through many charge cycles already and still performs great. Anyway, lets get on with it…
Syma S107 battery replacement Instructions
Okay. So now that we’ve got the background out of the way, lets get into the details of how to perform the swap.
And that’s it! Your Syma S107 Battery is now ready for charging. Nothing left to do but sit back and enjoy the improved performance and longer flight times.