Batteries

Keep your batteries away from any temperatures that are high. A case such as silicone will protect your batteries from damage. There are batteries like removable e-cig batteries but there are some important facts to consider like for example don’t put water on the battery case nor have damaged to the case. Another thing is to avoid short-circuit and over-charging. As for external battery also, you need to use a battery case because if they touch metal like your keys phone, or money, they could be damaged or vented.  The batteries are usually lithium-ion.