110v Charger for SYMA Mini Helicopters S107 S105 S009 and others

Item Description

Charge your Syma helicopter with out having to drain your transmitter batteries or use a laptop or computer in much less time. This charger will not work correctly on Fake Syma S107 do to the truth they are wired diffrently

Product Details

• Shipping Weight: 10.1 ounces (View shipping rates and policies)
• ASIN: B004DETSN4
• Amazon Best Sellers Rank: 15 in Toys ; Games (See Top 100 in Toys ; Games)
• 1 inToys ; Games Hobbies Radio Control Accessories Battery Chargers

By : Syma
Price : $4.82

Product Characteristics

• 110V Charger for Syma Mini Helicopters
• Can be implemented on Syma Helicopters with smaller white Charging Plug
• Quicker Charging with less Battery Drain on Transmitter.

Client Critiques

The charger has a fixed plug for North American outlets. The input is rated 100-240VAC, 50-60Hz. The output is rated four.2VDC, 350mA (it really is about 4.6VDC open circuit). There is an LED that lights dark yellow in the course of charge, and green when charge is total and when no battery is connected.
The LED basically begins to turn into a lighter yellow when the battery reaches 4.1V, a lighter yellow-green at 4.15V, and is green at 4.2V. If you only charge to four.1V, you will get a lot more cycles but if you charge to 4.2V, you get a longer flight time - it essentially averages out.
Through my testing, this charger only put out its rated output on particularly discharged batteries and just for a minute. It is generally only placing out about 250mA right after five minutes, with the battery at about 3.87V. The battery will reach 4.1V right after about 40 minutes. It takes a further 15 minutes to reach 4.2V, which may give you an added minute flight time.
So you can see why I'm a little dubious about many people claiming that this charges their battery in 15-20 minutes. If accurate, I have to assume their batteries are old and only give a couple of minutes flight time. I ordinarily get about 7-8 minutes.
Still, this will charge the battery 20-40 minutes quicker than the USB cable charger, and the LED gives a reliable indication of when the battery is filly charged. I'm only giving it 3-stars considering that the output is weak (which is likely great for a single 150mAh battery - I use two in parallel for 300mAh, with a 1.5 hour charge time, and a 15-16 minute flight time), and it would be good if the voltage was limited to four.2V to decrease overcharging the battery.
I also measured the USB cable charger. It puts out about 250mA max, and the open circuit voltage is about 4.6V. The battery reaches four.1V in about 60 minutes, and 4.2V in about 85 minutes. The USB plug will start out an occasional dim blink at about 3.93V and 35 minutes a dim glow/blink at about 3.96V and 40 minutes and a dim glow at about three.99V and 45 minutes. The glow will get brighter as the voltage increases. Immediately after about two hours, the battery voltage is four.3V and climbing.
With either the wall plug charger, or the USB cable charger, due to the fact they each have an open circuit voltage of four.6V, I can only assume the battery will keep increasing in voltage till the safety circuit in the battery cuts off the charge. This may possibly ultimately shield the battery from failure, but is nonetheless not good to charge LiPo batteries over 4.2V. Do not leave the battery on either charger for extended periods.

This charger is terrific. When I charge with the USB it takes about 1hr. This charger cuts it down to about 20-25 minutes. This truely lets you use your helicopter more. Well worth it and a excellent addition to the S107