Most rechargeable e-cigs use lithium-ion batteries. This means there are some key safety points to remember whenever you’re using them.
Use only the charger provided with the product. Don’t use a different one even if its adapter fits into the device port. Do not overcharge your e-cig. Leaving it charging continuously can increase the risk of a fire.
Never charge them overnight or while you are sleeping. This is when many fires occur.
Protect your e-cig from being pierced, crushed, dropped, or otherwise damaged. Lithium-ion batteries can go into what’s called thermal runaway when compromised. This means they can explode and cause a very serious fire.
Keep your e-cig away from other metal objects like coins and keys. These items can cause it to short-circuit and start a fire.