The SpareOne is a simple phone from Xpal Power that'll hold a charge for up to 15 years unused, and should give you 10 hours of talk time all from a single AA cell. The phone is designed for use in emergency and travel situations — it features a flashlight, and transmits location data along with caller ID. Not to miss a chance for cross-promotion, Xpal Power is recommending its own Energizer Ultimate batteries, and one is included with the phone. The phone goes on sale nationwide for $49.99 this quarter.