Not all chargers are created equal so you have to choose well before you spend on them. I am not an expert but I would recommend the maha mh-c9000 battery charger because it charges each battery individually. My son has been using this charger for years and even the batteries that went with it when we bought it are still functioning well. Most of the battery chargers you will find will charge all of the batteries with the same amount of electricity. This could be bad because the other batts that don't need much power will be overcharged. It is dangerous as well because there is a big chance they might explode. Sure there are a lot of cheap chargers around but I'd rather be safe than sorry.