Thank you for you for your question. We do not offer 12v automotive charger.
Thank you for your question. No, the DC18SE 18V LXT® Lithium-Ion Optimum Automotive Charger is not capable of charging 12 Volt batteries. Please see the DC18RE 18V LXT® / 12V max CXT® Lithium‑Ion Rapid Optimum Charger.
I believe so. Here's why: when I put a 5.0ah battery on the charger, and the vehicle is running, charges just fine. And most of the time without the vehicle running it charges just fine. BUT sometimes, when I'm opening and closing doors, lights are on all day and the vehicle battery is too low to start, I look at the charger and it is flashing red and green lights indicating bad battery. It's not really bad, there just is not enough juice to charge the battery. I've noticed after using this charger for over a year, it does this occasionally when the vehicle is not running
Put it in a bucket of water.
Thank you for your question. The charging melody is a feature of the DC18RC 18V LXT® Lithium-Ion Rapid Optimum Charger and can be changed by following the directions on page 3 of the included instruction manual.
Thank you for your question. Please see the BL1830 18V LXT® Lithium-Ion 3.0Ah Battery which is compatible with Makita tools that are not equipped with Star Protection.
The circuit to perform this usually referred to as a "step up charge controller", because it steps up the voltage from the input voltage to the voltage needed to run the device, so in this case, changing ~12v input to 18v or so as needed to charge the battery. Hope it helps.
Thank you for your question. Yes, the DC18SE 18V LXT® Lithium-Ion Optimum Automotive Charger will charge all Makita 18V LXT® Lithium-Ion slide-style batteries including the BL1815.
This product is compatible with Makita 18V LXT Slide Style Lithium-Ion batteries only.
In the compatibility section of the specifications, it says "Makita 18V LXT Slide Style Lithium-Ion Batteries" and in one of the images, it says it can charge a 5.0AH battery (which is LXT style) in 90 minutes, so I think it will charge all 18V Makita batteries.