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Your e-cig battery may not be holding a charge because:
Cleaning the battery
Unscrew the battery from the blu Tank™ and look at the threads. If they are dirty, clean them by following this simple process: 1. Unscrew the battery from the blu Tank™. 2. Get a cotton swab (Q-tip) and the battery. 3. Take the cotton swab and rub it over the battery threads in a circular motion. If the threads were dirty, you will see the residue on the cotton swab. 4. Blow on the battery threads to make sure any extra residue is removed. 5. Screw the clean battery into a blu Tank™ and take a drag on your e-cig.