When to Replace Your Vape Battery 7 Warning Signs Majestic Vapes Beginner Level Vape Tricks to Do: Impress Your Friends! My Vape Review Is this battery acid? Left my vape dormant for a year with no battery or juice inside and found this. Can this be cleaned and used safely again, or should I just Lithium ion batteries can be flammable and release toxic gases when not used correctly. It's important to check your batteries for physical and electrical damage, exposure to extreme temperatures, and any defects.