My DIY portable charging case for BV510, using my old mobile phone battery rated 1800mah and USB hub,. little bit soldering works. Simple and practical, just plug in the USB charger, you are ready to go!. Anybody can make it . The USB charger can be get from my "accessories" section. Suitable for 510, 808D, 801, 103 and 901 batteries.
Get our e-cig kit here and start saving !