Thank you for your inquiry. Yes, the iSurge is compatible with the iPhone 3G, 3GS, 4 and 4S – the only difference is the interchangeable/removable plates, as there are different plates for the 3G/S and 4/S, so the phone will seat properly and securely on the docking station.

Thank you for your inquiry. If the light is solid or shuts off completely, that is usually an indication that the charger may not be functioning. If the charger is less than 2 years old it is covered by warranty and can be replaced if you send the unit with a receipt and return address to the following:
Performance Designed Products; 1840 E. 27th St., Vernon CA 90058

If the lights are flashing, without any controllers or batteries placed on the charger, this is an indication that the charger has ceased to operate. Depending on how long you’ve had the batteries and how long it’s been since you last used the controllers, it may be time to replace the battery packs.
Our batteries are sealed (Ni-MH) Nickel-Metal Hydride rechargeable batteries. To maintain their life expectancy stored batteries should be charged periodically (every couple of months). The expected life of the batteries varies depending on use, and designed for between 300 – 500 charge cycles. If the batteries are less than 2 years old and have been used less than this number of cycles, please send your name and address to the following and these can be replaced for you, free of charge:
Performance Designed Products; 1840 E. 27th St., Vernon CA 90058

To speak to a Performance Designed Product Customer Service representative directly, please call 1-800-331-3844
Monday-Friday 7am-5pm PST;
or visit the following address on-line at http://support.pdp.com/ics/support/default.asp?deptID=5553

Thank you for your inquiry. For Energizer XP4001 replacement information, please call:
Tel. (866) 972-5769
M - F, 8:00am - 5:00pm PT

For any additional contact and technical specifications information, please visit the following address:
http://www.energizerpowerpacks.com/us/contact/contact-general.html

Thank you for your inquiry.
If the lights are flashing, with or without any controllers or batteries placed on the charger, this is an indication that the charger has ceased operation.
Depending on how long you've been using the same batteries and/or how long it's been since you've used the controller/charger batteries, it may be necessary to update the batteries.
Our batteries are sealed (Ni-MH) Nickel-Metal Hydride rechargeable batteries. To maintain their life expectancy stored batteries should be charged periodically (every couple of months).
The expected life of the batteries will vary depending on use, and designed for 300 – 500 charge cycles. If the batteries are less than 2 years old and have been used less than 500 cycles, please contact Performance Designed Products for replacements. All we need is your name and address.
You can contact our PDP Customer Service team at 1-800-331-3844 Monday-Friday 7am-5pm pacific standard time;
or online at http://support.pdp.com/ics/support/default.asp?deptID=5553