Charging rates depend on the specific battery, they usually seem to say "up to 5c", what this means is you can charge a 2000 at 5x2amps, so 10 amps, but if it's a 5000 you can charge at 5x5amps, 25 amps. Check your battery label and any instructions that came with them. Generally, most chargers aren't capable of charging lipos as fast as the batteries can handle.
The 25c on your packs is the discharge rate, the higher the discharge rate the more power a pack can put out when the ESC asks for it. When you get to a really fast motor you'll ant 50c+ but yours should be fine for now. Again, as with the charge rate the c is for capacity, so it basically mean 25x4amps, so you batteries can output 100 amps constant, they should be able to do a little more for short bursts, but often that figure isn't documented.
Ultimately, if you have too low a discharge rates you'll damage the batteries, possibly blow them up. Before that happens you'll notice them getting hot, but it wont happen with a 13t in a 2wd, especially with your Etronix ESC as that would go first as it's only rated at 54 amps.
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TLR 22
B44.2
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