CRAFTSMAN 12A Car Battery Charger and Maintainer, 4-in-1 Solution, Battery Tester, for 6V/12V Power Sport, Automotive, and Marine Batteries, CMXCESM258

What It Is

The Craftsman 12A Car Battery Charger and Maintainer (CMXCESM258) is a 4-in-1 device that charges, maintains, tests, and desulfates 6V and 12V batteries for lawn mowers, power sports, automotive, and marine use.

Fitment & Compatibility

• Battery types: Works with standard lead-acid, AGM, gel, and deep-cycle batteries (6V or 12V). Not compatible with lithium-ion batteries.
• Voltage & amperage: Outputs 12A for fast charging; includes a 2A maintain mode for long-term storage. Ensure your battery’s voltage matches (6V or 12V only).
• Connectors: Comes with clamps and ring terminals. Verify your battery terminals are standard top-post or side-post (no specialized connectors like SAE or Anderson).
• Battery size: Handles batteries from small riding mower (12V, ~20Ah) up to large marine deep-cycle (up to 120Ah). Check your battery’s Ah rating – charging a very small battery (under 10Ah) with 12A mode may overheat it.
• Not a lawn mower deck part: This is a standalone charger, not a mower component. No deck size or model number fitment needed.

Key Things to Know

• Quality: Solid build, UL listed, overcharge protection. Rated 4.5/5 – reliable for occasional and regular use.
• Installation difficulty: Very easy – just connect clamps or ring terminals (red to positive, black to negative). No tools needed for basic use.
• Common gotchas:
  • Do not use 12A charge mode on a battery below 10Ah (e.g., small portable mower batteries) – use 2A maintain mode instead.
  • The desulfation mode is automatic but slow – can take 24+ hours to revive a sulfated battery.
  • The battery tester is basic (shows voltage and charge status) – not a load tester for health diagnosis.
• Safety: Keep away from sparks/flames; charge in a ventilated area. Clamps are reverse-polarity protected.

Should You Buy It

Buy this if you own a riding mower, zero-turn, lawn tractor, or any 12V/6V battery-powered equipment and want a single charger that can fast-charge, maintain over winter, and test battery health. It’s ideal for DIY homeowners who maintain multiple batteries (mower, car, boat) and want a versatile, no-fuss unit. Skip it if you only need a trickle charger for a tiny battery (under 10Ah) or if you require a professional load tester.