BC-TRW vs BC-QM1 Battery Charger

[digitalkl]

Am looking for a charger for the NP-FW50 batteries and came uopn these two.

I wonder what is the difference between these two other than QM1 is able to charge other types of battery besides NP-FW50

Also is BC-TRW a rapid charger like QM1?

Thank you so much for your inputs

[Bieomax]

Pretty much the BC-TRW is for one type of battery - InfoLITHIUM
NP-FW50 (W type?A7(r)/Nex/A33/a55)

the BC-QM1 is capable of lots of types of sony batterys

the BC-TRW is marketed on other reputable sites as a fast charger also

I notice that these newer chargers have the option to be plugged in via USB to charge, of which i'm a little jealous of since my A57/A33 & Nex chargers are all just wall socket.