FastMac has revealed their second generation of battery packs for iPhone 3G, and they promise 24 hours of conversation, 750 hours (31 days) of standby over 20 hours of video and almost 72 hours of audio playback. Depending on your settings, it means a tripling or quadrupling of autonomy for your phone. Obviously, he must contend with a look of walkie-talkie, but if you agree to this sacrifice and spend $ 80 (65 €), you also gain significantly increased autonomy torch LED and a second USB port on which recharge your gadgets.