Amazon.com: 1900 mAh Portable Black Ultra Slim External Backup Charger Battery Case For Apple iPhone 4 4G & 4S : Cell Phones & Accessories
Maxboost iPhone 4S Battery Case/iPhone 4 Battery Case (1900mAH, Fits All Versions of Apple iPhone 4 & 4S) - Detachable Battery Charger Case External Rechargeable Battery Pack Charging Power Case (B00PKWTMZW)
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Amazon.com: Ogodeal Battery Replacement for Model IP 4S A1431, A1387 with Full Set Repair Tools Kit and Battery Adhesive Stripe and Instructions [365 Days Warranty] : Cell Phones & Accessories
Amazon.com: uNu DX Lite iPhone 4S Battery Case / iPhone 4 Battery Case - Black / Crystal Black (MFI Certified, Stylish Bumper Style Case with 1500mAh Built-in Battery Fits All models of
SMARTEC24 iPhone 4S ® Battery Type: Li-Ion / APN 616?0579. Replacement Battery for iPhone 4S, Lithium-Ion Polymer Technology for maximum Leistungsfähigkeit./3.7 V 5.3 Whr VPN: GB-S 10?423282?0100 / 1430 mAh: Amazon.co.uk: Electronics
Amazon.com: Energizer Power Battery Case with 1200 mAh Battery for Apple iPhone 4/4S (Black) : Cell Phones & Accessories
Amazon.com: power bank iPhone 4/4S Battery Case 2400mAh - Pink : Cell Phones & Accessories
iPhone 4S Battery - iFixit
iPhone 4S Replacement OEM Battery
Amazon.com: Ogodeal Battery Replacement for Model IP 4S A1431, A1387 with Full Set Repair Tools Kit and Battery Adhesive Stripe and Instructions [365 Days Warranty] : Cell Phones & Accessories