Both batteries and chargers vary widely in quality. They are not created equal. It would be in your best interests to invest in quality brand-name batteries and charger. Any battery or charger has the potential to fail, but investing in the higher brand name products decreases your chances of being involved in an accident.
Statistically, most battery-related incidents occur while a battery is being charged. The chargers are supposed to have chips which will terminate the charging process once the battery receives a full charge, but electronics have been known to fail. Therefore, it is safe battery practice to not charge a battery when you will not be able to observe its progress.
Do not charge batteries and leave the house. Do not charge batteries overnight when you will not be awake to observe an accident during charging. Protection chips have been known to fail. Li-Ion batteries have been known to vent with flames and even to explode; you wouldn't want this to occur while you were not around to take appropriate action. The odds of this happening are probably small, but if it should happen to you it will be a big deal for certain.
Take a few minutes to learn about the different types of batteries available to you for your mod by reading the following blogs. The most recommended chargers are made by Pila, Extar, and Nitecore Intellicharger.
BATTERY BASICS FOR MODS: IMR OR PROTECTED BATTERIES?
DEEPER UNDERSTANDING OF MOD BATTERIES
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