Standby Time: 4 months. Holding Time for 4/4S: 24 hours. Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on Pinterest (Opens in new window)Click to share on WhatsApp (Opens in new window)Click to share on Skype (Opens in new window)Click to share on LinkedIn (Opens in new window) Related admin 1800mAh Snap In Back Power Case Charger For iPhone 4 &. 4S 1900mAh Portable Charger