Having just been through the dead charger thing, I just picked up another nitecore i4. The hubby was doing the research and everything he could find was listing weird battery sizes for the Pila and not the 18650s and 18350s I use. As he put it if we are replacing the charger every 6 months then oh well it isn't that expensive and we know the i4 works.
The Pila will indeed charge 650's and 350's. Ours gets used for 18350, 18490, 18650 and even 14500's. We have 4 chargers, a Pila, a Tenergy and two xtar 2 bay chargers. The xtar's are nice for travel packing and we always take 2 chargers when travelings. The Tenergy is nice because the contacts are spring loaded and it doesn't need spacers for different size batts. If we didn't already have 4 chargers, I'd get one of those Nitecores that doesn't need spacers.