You have to use a special charger to charge lipo's. Some are capable of charging all of them, but they're not cheap. Mine was over $80. You can pick up a lipo/lithium specific charger for somewhere around $20-25. My son-in-law has a Triton which is a very good programmable charger (not cheap, but good). Mine is preset to charge at .5 amps. An 1100 lipo takes me 3 hours to charge. But charging slow also means there's no risk of overheating. Also, before you step up to lipo's make sure you read up on the dangers involved in improper charging and especially draining them too low. You can't run down a lipo like you can your nimh. Drawing the voltage too low can cause it to explode, as can overheating and overcharging. That's why most people opt for a good charger to reduce risk. They're safe if handled properly. So learn proper technique before you use it.