I need a Lipo charger. I gather the Imax B6AC V2 is the one to go for? I see ones on ebay for around £20 and then more expensive ones branded SKYRC on Amazon which I assume is what all the clones are based on? Should these generic ebay ones be avoided or are they OK? There seems to be lots of versions/copies and it's a little overwhelming. I would normally just go to component-shop but I don't recognize the chargers they stock.