Battery Tender 021-0123 Junior 12V, 0.75A Battery Charger and Maintainer – $39.95. $39.95 at Amazon. Key Features. 12V 750mA battery charger; Spark-proof circuitry ...

When it comes to our cars’ electrical systems, most of us know just what we need to get by. This is especially true of battery maintenance: Keep your terminals clean, jumpstart it if you park ...