NEW! All in one integrated power pack for Nexus 4, now with 2A USB power out - charge your accessories while charging your phone. Case holds phone, extended life 1250 or 2500mah battery, and electronics to extend operating time. Includes electronics, replaceable battery and external rapid charger. Phone slips into top of case, and the charger and battery are hidden behind phone. Solar module option re-charges anywhere in full sun. Easy to carry solution for extending battery life. Weight 1250mah 72g, 2500mah 98g