Imax B6 all the way. I know its not the cheapest but they can charge almost any type of battery with different number of cells. You can choose the exact charge rate and they balance lipo well and it is durable. They only downside I can see is that is beep when you press buttons
And also the batteries in phones and laptop are lithium-ion not lithium polymer. They are a lot less fragile and can handle overcharge better. However they are usally a lot larger for the same capacity and have lower discharge rate.