Make Or Break = Weather you will enjoy the car or Not...

a 1900mah Battery is going to last around 7-8 minutes...

It is Recommended you buy a Battery that is rated at LEAST 3000mah in order to get a Decent run time out of your Car.
Drifting on a Smooth Surface with Home Made Polypipe tyres I can get at least 20 minutes Solid drifting from a 3000mah Intellect Battery..

It is also Recommended Getting a Delta Peak Charger that will peak your Batteries ensuring that they are properly Charged and looked after.

So A Charger that has an Amperage of 2 amps.. is going to take 1 Hour to charge Your 1900mah Battery..
Buying a Charger that has an Output of 3 - 5 amps will charge that same Battery in around 30 mins..

Make Sure that your Charger is nimh/nicd Safe..

Charging a Nicd Battery on a Nimh Charger is a Bad thing
Charging a Nimh Battery on a Nicd Charger is a Very Bad thing..

Make sure your Charger can do both..

If Your not sure what to Buy, Just post up links and we can assist you in deciding..