It's National Battery Day! Did you know that some items like e cigarettes and spare lithium ion batteries are actually hazardous if packed in a checked bag? Learn more on how to #PackSafe E Cig and Vape Battery and Electrical Certification UL Solutions Rokin Cart How to Tell If My Rokin Cart Battery Is Charged TikTok This is how you check batteries without a tester., No tools., Do this:, Drop the battery vertically, Listen and watch how it lands, Heavy thud = usable, Springy bounce = time to replace,