Good deal many could use: 1.5 Amp Speed Charge Maintainer + Battery Charger - $16.50

[dcasalena]

Amazon deal 72% off and free shipping for orders over $25:

Schumacher SEM-1562A 1.5 Amp Speed Charge Maintainer
Product Features
6-volt and 12-volt battery charger; automatically changes from full-charge to float-mode monitoring to prevent overcharging
Ideal for keeping batteries charged while in storage
Rugged plastic housing
Includes charger, jump cables, ring connectors
7.1 by 10.5 by 5.9 inches; 5 pounds; 1-year limited warranty

edit: Can't seem to get a link to work, but search Amazon for this :
Schumacher SEM-1562A 1.5 Amp Speed Charge Maintainer