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, Is juice in my battery wrap a problem? : r Vaping Electronic Cigarette ecig e cig How to Check if Your Vape is Genuine Royal Flush Vape Vape Battery Guide Everything You Need to Know Vaped Understand the Importance of Battery Health in Vape Devices