Today only, All4Cellular offers the Stitchway 1900mAh Backup Battery for iPod / iPhone, model no. CHEX-ALL-BK-08-319, for $4.99 with free shipping. That's $1 under our January mention and the lowest total price we've ever seen for this battery. (It's also a current price low by $1.) It purports a full charge in less than two hours.