There is nothing wrong with running an ICS Turbo or any E1 motor on any lipo. I have ran as large as 5000 mah 35c 11.1v lipos on my E1 RPK's. It's not the motor you need to worry about. It's the nozzle, heads, piston, gears, switch, and wires thatcatastrophically fail.
1000 to 2000 mah 7.4v of 15 to 25c dump are perfectly safe in any stock ICS or E1.
1000 to 1500 mah 15c 11.1v's are as well.
Here are some inexpensive charger options:
Go on ebay. Type b3 charger. Below is one. Pick the one you want with the shipping options you want. They are a simple, smart charger. They are between $7 and $12 each.
http://m.ebay.com/itm/310883691105?nav=SEARCHIf you want I great charger with a lot of features then go with the b6. Ensure that you get one with a power supply or you will have to buy it separately. They run from $18 to $35. The $18-$25 ones don't have power supplies. They sell them all over the world and have different wall plugs. Bellow is a link for a $30 one.
http://m.ebay.com/itm/281521625298?nav=SEARCH