My hobby is RC Helicopters so I have a few of those chargers - my main one was £230
But look at this - it runs mains and also takes D-cell batteries for charging at the field. It is for the Blade MSR helicopter and will charge four single cell 3.7v LiPo batteries at once
Fast Lad Performance
You are much braver than me! I can't fly the hellicopter even in the simulator hehe!!! My R/C love is toy tanks! I have 2 so far, one upgraded to full metal parts that is a Panzer III and a Tiger 1 that is still plastic but my favourite because its big!!! They use Nimh battereis so my charger cost £20