Battery percentage swings too much

[andrebstv]

Hi,

1st of all, it`s a nice app! Way ahead of stock king song.
But I notice that the battery percentage swings quite a bit. I see that probably more than most because I ride a KS14b with a small battery (148Wh). When I push the wheel the voltage probably sags momentarily and causes the indicated value to be lower than actually is.

My suggestion would be to implement a filter so it takes more then a couple seconds to change the value. A simple FIR would suffice.

Ive cloned your repo and will try to do that mod, but Im quite noob @ android dev so it might take a while.