Portable charger, including portable sleeve, for an electronically readable card

摘要: Convenient, portable chargers for recharging a secondary battery in an electronically readable card which can be sleeve form. The are lightweight and desirably have dimensions that not much larger than those of card. may include connector such as securing card, power source providing interface delivering the from to take on variety forms including another battery, photovoltaic array or direct plug connection electric wall outlet, Universal Serial Bus port telephone jack. In some embodiments charge by inductive coupling.