that charger will take a long time to charge a 6500 4s battery. it will only do roughly 3.5 - 4amps max on a 4s at 80w.
finding a charger in your price range that can properly charge a large mah 3s and 4s battery will be hard to find unless you buy used. you're really looking at needing a $150-$200 charger(in an AC version) to get the kind of output required to properly charge those large packs. a dc version usually has more output capabilities because an external power supply is usually a lot more powerful. but you're looking at $80-100 typical for one. old server power supplies work well and are around $50 I think.

its not just time of charge to think about. you have to have a proper amp input to the battery. I have an instruction sheet with my new 6500 4s smc racing batteries that say do not charge less than 1c. to do that I would need a charger that would charge at min 6.5 amps. probably looking at 150-200w just to get the 6.5 amps into a 4s.

so this has had me researching new charges. I've come to the conclusion the Icharger 308 duo is probably one of the best all around chargers on the market. if I didn't need to charge up large cap 4s batteries I wouldn't need it. but this dude has tons of power(800w and 30A) and my current power supply should be enough to get mine at 6.5A.