CRAFTSMAN 6V/12V 10A Battery Charger & 250A Engine Starter — Steel Case, Manual Boost and Timer

The CRAFTSMAN CMXCESM233 is a rugged 2-in-1 manual battery charger and 250-amp engine starter designed to revive dead batteries and supply high starting current when automatic chargers can’t.

If you need a no-nonsense battery charger that gives you hands-on control and heavy-duty starting power, the CMXCESM233 delivers. It combines a 10-amp 12V charge mode for routine charging with 25A and 50A boost options and a 250-amp engine-start feature to handle larger engines. Built in a steel case with robust clamps, a retractable handle and solid wheels, this unit is meant to be used in garages, workshops and on farms where durability and serviceability matter more than touchscreens.

How does this charger recover deeply discharged batteries?

This charger uses manual boost modes that force current into batteries traditional smart chargers may ignore. Choose 25A for 6V or 12V batteries or 50A for tougher 12V recovery, watching the analog ammeter to judge progress.

• 25A boost for small or moderately discharged 6V/12V batteries
• 50A boost for heavily depleted 12V batteries
• Analog ammeter for a clear view of charge rate and recovery
• Rugged clamps ensure secure connections during recovery

What does the 250-amp engine start do and when should I use it?

The 250-amp 12V engine-start mode delivers a high burst of current to crank larger engines that a normal charger cannot. Use this feature to start cars, trucks, SUVs and many RV engines when a battery’s charge is insufficient for ignition.

• High-current burst for immediate engine cranking
• Suitable for cars, trucks, SUVs and many RV applications
• Manual control to apply start power only when needed
• Combines with boost and charge modes for full-service recovery

How do I control charging and avoid overcharge?

Instead of fully automatic cycles, this model uses a 135-minute manual timer so you decide how long the unit applies current. The timer shuts the charger off automatically when time expires, helping prevent overcharging when used properly.

• 135-minute selectable manual timer for staged charging
• Timer auto-shutoff limits risk of prolonged charging sessions
• Analog meter offers live feedback so you can stop charging as needed
• Use lower-amp modes for maintenance, higher-amp modes for recovery

Which battery types and vehicles are compatible with this unit?

The CMXCESM233 supports both 6V and 12V systems and several battery chemistries, making it useful across a broad range of vehicles and equipment. It’s compatible with standard flooded batteries plus AGM, gel and deep-cycle types when used according to the battery maker’s guidance.

• Works with 6V and 12V standard flooded, AGM, gel and deep-cycle batteries
• Intended for motorcycles, ATVs, cars, trucks, SUVs, RVs and marine batteries
• Engine start for larger gasoline and diesel engines
• Heavy-duty clamps and steel chassis for workshop use

Who is this for? The CRAFTSMAN CMXCESM233 is aimed at mechanics, hobbyists and property owners who prefer a hands-on charger with substantial starting capacity and long-term durability. If you work on or maintain multiple vehicles, need to revive batteries that automatic chargers won’t detect, or require a high-current engine-start option, this unit gives practical control and rugged construction to get the job done.