Amazon.com has a Duracell D2A 2 AMP 12V Battery Maintainer / Charger for $10. Free Shipping on orders over $25.
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- Maintains and extends the life of a battery in your ATV, snowmobile, motorcycle, car or truck n
- 2-amp constant DC output current n
- Micro-processor controlled three-stage charging extends battery life n
- Easy battery connection through three types of connectors provided with the unit: clip leads, DC lighter plug and ring terminals n
- “Plug and play” charging solution; requires no installation or setup