3.7V Li-po Battery for SYMA S107 Original Factory Replacement Part S107G-19

Product Details

• Shipping Weight: 1 ounces (View shipping rates and policies)
• ASIN: B004KGTM90
• Amazon Best Sellers Rank: 284 in Toys ; Games (See Top 100 in Toys ; Games)
• 2 inToys ; Games Hobbies Radio Control Parts

By : Syma
Price : $5.10

Product Description

Has your Helicopter lost it's power. Will it no longer hold a Charge. This is a Factory Replacement 3.7v Li-Po Battery. Light Soldering is Required.

Product Features

• 3.7v 150 mAh LI-Po Battery
• Original Factory Replacement
• Never leave a Charging Battery Unattended

Costumer Reviews

I bought this battery to perform some experiments with increasing my flying time. This worked great. I now average about 15-16 minutes flying time, and that is just until is starts to get a little weak. I could easily go another couple of minutes, but I don't want to push the batteries that hard, and it's a lot more fun flying with charged batteries.

This modification is safe and easy. This is because these cells use safety circuits to limit over discharge and over charge. There are a few precautions though:

1. Use two batteries of equal age. This means a new battery in a new heli and a new replacement battery, or two new replacement batteries. Do not mix a new replacement battery with an old, worn out battery.

2. Use two batteries of equal charge - preferably discharged. This is not critical, but it is better to start with two discharged batteries so they don't have any significant energy if you accidentally short something. Also, it just keeps everything in better balance from the start.

3. Hook up the batteries in parallel - red to red and black to black. This doubles the battery capacity and increases the flying time. If you hook them up in series (end to end), you will double the voltage, which will burn out the motors if it doesn't fry the heli's circuit board (and you won't be able to charge them anyway).

This is how you make the modification. First, the new battery is probably fully discharged, so fly your heli until the battery is discharged (unless you are using two new cells). Then splice the new battery in parallel with the battery in the heli. I found it easiest to just cut out the existing battery, leaving about equal lengths of red and black wire. Then I trimmed the wires on the new battery to the same length. I then stripped and tinned all the wire ends. I then soldered the two batteries together, red to red and black to black. Using the double sided tape that held in the old battery, I stuck them together. I then slid some heat shrink over the wires coming from the heli. I then lap soldered the battery wires to the heli wires, red to red and black to black. I then slid up the heat shrink over the solder joint and shrunk it. You could also wrap the wires together and cover them with tape, but that is probably harder in the limited space, and they won't hold as well as solder. Then I removed the weight taped in the nose of the canopy. Finally, you just locate the battery over the battery holder (see photo) and slide on the canopy - it's a snug fit, so there is no need to tape down the battery.

With this simple modification, you will double your flying time - or more. Each battery has half the current being drawn from it, so they maintain a higher voltage for a longer time. It's like the first minute or two with a single battery, but for 10-12 minutes. Depending on how hard you fly, even after 14-15 minutes, you can still fly up to the ceiling. After about 15-16 minutes, I start to notice that the heli is losing trim and it is harder to maintain lift. I could easily keep going another couple of minutes, even flying in ground effect, but why push the batteries that hard. The down side is that it would probably take 3 hours to recharge using the USB cable charger. So instead, I'm using the wall plug charger that takes about 1.5 hours or less to fully charge the battery. The heli is also a little nose heavy, but I like that, and many people add nose weights anyway. With the heavy nose, you always have forward momentum, and I think it's easier to control. You can also go really fast in the forward direction, but very slow backwards and you can't really hover. You can also add counter weights to the tail (like the weight from the nose) if you don't like it.

Some other notes on battery life:

1. I estimate that the heli draws about 1.2A to maintain altitude.

2. Full throttle draws about 1.5A max with a fully charged battery, but usually about 1.35-1.4A.

3. Running the tail motor draws another .2-.25A.

4. The LED only draws about 12mA, or only 1% of your average current.

So you see, if you just maintain altitude, drift forward, and only turn right and left, you only draw abut 1.2A. But if you are constantly zipping up and down and forward and backward, you are drawing about 1.65A. I'm probably somewhere in the middle and I get a good 15-16 minutes. Your results may vary.

-Cheers

This was a replacement battery for a Syma 107 that had over 100 flights. Hope

the new one lasts as long. Key thing, with these batteries let them cool before

and after charging.