Sell the chargers to whomever.
Sell the cards to their intermediary.
Dismantle the batteries to cook a batch of meth, and sell the meth to finance more phone purchases.
That is looking on the bright side of things: druggie scum, rather than terrorists...but still scum.
Put 1000 lithium ion batteries in a container packed with Thermite and then ignite it.
Or you might try connecting them in parallel and then charge them at 30 amps and 15 volts.