Check Out The iKrusher S3: The Best 510 Battery How to Recharge A Vape or Pod System How To Quickly Troubleshoot Your Vape Cartridge And Battery Feel State Cannabis Dispensary 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, Select Vape Pen Batteries Instructions: How to Use MUVATEGLOBAL