A battery pack for an electronic device comprises battery cells, a battery charging circuit, and an energy receiving element adapted to receive power from a planar inductive charging system. The energy receiving element has an inductance and a capacitor is connected to the energy receiving element and...http://www.google.com/patents/US20070029965?utm_source=gb-gplus-sharePatent US20070029965 - Rechargeable battery circuit and structure for compatibility with a planar inductive charging platform
