... added, our system can provide a 4.2V for charging mobile phone battery.Different switch options: Key switch (standard) or ... : 13cm (standard) or customize 2) Battery: 3.6V 3) Power adapter: DC-6V (as options), (If required, please make statement before ... , please make statement before ordering) 12) Charger function: 4.2V mobile charger output, (If required, please make statement before ordering) 13 ...