Meritline offers the OnCore Portable USB Backup Battery / Charger
, model no. ETC-500, for $12.99. Coupon code "MLCQ22HN" cuts it to $8.45
. With free shipping
, that matches our August mention and is the lowest total price we could find by $4. This battery / charger allows you to charge your phone from an outlet or from its built-in 1,300mAh back-up battery. It comes with six connectors and works with many iPhone and Android phone models.