Chargers are a fundamental tool of the electric modeler. Here are some comments on several you might want to consider.

The Hobbico Quick Field Charger MkII is a great addition to your field box. It is an easy-to-use dual charger that comes in a small package.

The Pro-Peak Prodigy II charger is one of my favorite chargers on and about my hobby bench and field box—primary because of its rich set of features.