I've been pleasantly surprised by my Turnigy Reaktor 300W/20A charger (with turnigy PSU) gives the 4s batteries a good charging!
I've also found the SkyRC RS16 (with eFuel PSU) to be rather nice, integrated and compact, just sits on the corner of the pit mat taking up virtually no room doing its job (most of my lipo sacks are bigger!)
One is more than twice the price of the other, they both work well.
One gets warrantied if it fails, the other gets chucked in the bin............
(personally speaking, i'd avoid twin/dual chargers, if one circuit fails, you are stuffed for charging, with two identical chargers/one big PSU, you can replace any part individually)
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