In order to solve the charging issue FullspeedRC (yes the same ones that launched the Leader series of micro quads) have released a simple board that allows the batteries to be balance charge using the existing USB port. It can be bought for around $10 at the following retailers:
Please note this is not a beginner install but if you can solder a FPV cam and vtx to a flight controller you can probably do this. I've put in a LOT of photos and steps in below to make it as straightforward as possible since Fullspeed's manual is accurate but overly short. As usual click any image below to embiggen.
Tools I recommend for this job:
So how does it go? It's works exactly as you would hope. You plug it in, it starts charging and it turns off when it's done. It charges up to 4.2v per cell which just right for a Li-Ion cell. It's a shame it didn't come like this from the factory but I'm glad fullspeed had the vision to come up with a solution.
Update: FRSKY have just announced 2 new x-lite variants (X-lite pro and X-lite s that do have USB charging as standard). These are more expensive than the base models of which there are a LOT in circulation. Now that mine has USB charging I personally see no reason to update for what I need from a controller.
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