Shumacher SE-40MAP Automatic/Manual Battery Charger, 10 Amp

• Solid state automatic charger has shutoff when battery is fully charged, then reduces to a maintenance level
• Special circuit for maintenance-free, deep cycle, low maintenance and conventional batteries
• Recharges automobile batteries in 3 to 7 hours and recreational deep cycle batteries in 8 to 11 hours
• Silicone control rectifier senses battery condition to prevent overcharge
• Two switches for versatility of uses and full automatic charging

As with so many products on Amazon, a big part of my beef with this charger is the minimal description. In this case it's actually misleading, implying that this is a highly versatile charger, which it isn't. I instead turned to an owner's manual that I found online, which is generic and likewise describes several functions (including adjustable current settings) not found on this unit, which is specifically designed for charging your car's starting/accessories battery, or for standard lead-acid 6 or 12 volt deep-cycle batteries. The unit seems to be fairly solidly built (in Mexico), a rather old-fashioned design based on a heavy 60-Hz transformer rather than a switching power supply. It's nevertheless microprocessor-controlled, and does a decent job of charging up your car battery without overcharge. However, it's not recommended for anything smaller than 40 Ah, which would exclude most motorcycle and lawn tractor batteries as well as UPS batteries. The only available settings are manual/automatic-SLI/automatic-deep-cycle and 6V/12V. There's no separate AGM setting, for example, even though those should have a different charging profile than flooded batteries. Overall, it's an OK product for its limited purpose.

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I purchased this charger and really like it it has an automatic shut off so as to not over charge the batteries which is very useful!

Read Best Reviews of Shumacher SE-40MAP Automatic/Manual Battery Charger, 10 Amp Here

A bit more difficult to use than I would have liked, and stops working at times. It has three settings manual, automatic, and automatic deep cycle. It's not clear to me when to use which setting. Sometimes it stops charging in automatic mode, but if I switch to manual, it starts charging again.