THIS BLOG ENTRY IS UNDER CONSTRUCTION AND PROBABLY FINISHED BY NOV/2018.
For those who don’t want to read through the below, here is the short version: Connect a 12V cigarette lighter adapter to one and a barrel plug to the other side of a step up converter and your car charger is done. For those who like more details, read on…
This is the end product:
The X10s comes with a wall charger and a 2S 7.2V 2600mAh Li-ion Battery. If the battery is not fully charged, the transmitter (TX) might not get through an entire day of flying. So here is a way to charge it through a 12V cigarette lighter adapter or – if you go one small step further – through a 2s or 3s LiPo battery as well.
I chose to go this way as I wanted to find a solution without invasive mods like opening the TX, soldering, changing battery chemistry and so on. I foresee to need a car charger only when on soaring holidays or for occasions when I have forgotten to charge at home. For most days, a charged TX battery will be just good enough.
Side note: The FrSky “Wall Charger” is not a charger with all the charging intelligence and algorithms behind it but only a AC-DC converter, providing a constant 15V 1A output. The charging intelligence is attached to the Li-ion battery inside the TX and it decides how much charging power is coming through and when to stop. In other words, all we need to do is to put together a device which provides 1A at 15V.
The step up converter I chose busts up voltages from a 3-24V input to 5-28V output and can provide 2A. It is important to note, that it can only bust up the voltage and not reduce it. So if we need a 15V output to charge the X10(s), we need to have an input between 3V and 15V not to cause any damage. In my case I will use a 3S LiPo or the car battery as a power supply, both provide about 12V.
- 1 Step up volt converter
- 1 Car lighter adapter
- 1 Barrel plug: 1.7mm inside, 4mm outside, plugs into the X10s
- cable, shrink tubing and a couple of plugs if you want use the charger with a LiPo as a field charger.
Optional: Instead of using a new barrel plug, you can cut off the one at the standard wall charger and connect it back using a plug (e.g. XT60, but almost anything will do). That plug would then also be used to connect the step up volt converter.
Read the captions of the pictures for step by step instructions.
I would like to thank James Mills and Colan Casey who helped through FB.