I sell & repair the Makita line of tools and the BL1830 (194205-3) battery is designed to fit on Makita's entire line of 18-volt tools. You didn't give the model number of your saw so my best suggestion is to make sure the saw is an 18-volt tool then make sure the tool's and battery's mating surfaces are OK. Try the battery in other tools & try other batteries on the saw. If this doesn't help please respond with the saw's model number or what you found out doing what I've suggested.
SOURCE: dont know when battery is charging.
there are usually lights on the charger to indicate what mode it is in. Let me know if not and I will try and locate a manual for this. If you do need that I would need the exact model number for everything
SOURCE: I cannot get a perfect 45 degree angle with my
When using the gauge on your saw it is off on the 45 degree cut? If so you might have to use a tri Square every time you want to cut a 45. Sometimes the lock gauge for the 45 angle may be off some. When you put a tri square on the board you cut it is not a true 45 even though the saw says it is?
SOURCE: Battery compatability
The two are not compatable. The battery chargers are also not compatable. The main difference between the two batteries is the Amp Hours. The 1815 is only 1.5 Amp Hours and the 1830 is 3.0 Amp Hours. The slide pattern for the batteries are different respectfully. You will need a DC18SA battery charger to charge the 1830 batts.
Testimonial: "Thanks for the help!"
SOURCE: I have makita bss610 battery operated circular saw
The usual problem with these types of units is the battery goes bad and won't accept charge anymore, or the charger itself is defective due to a broken power cord. Obtain a DC voltmeter and check the output voltage of the charger where it connects to the battery. It should measure several volts higher than the rated voltage of the battery. If this checks good, measure the voltage at the battery terminals which should be somewhat higher than the rated voltage. Problems in the motor can be the switch itself, or it may have a defective brush. Connect the meter to the wiring with the battery plugged in (if it is charged) and check for voltage at the motor with switch turned on. Remove each brush and check for length, burning, collapsed spring, or other damage. Occasionally, a wire can break within the field winding due to vibration. Hope some of this helps!
SOURCE: The return spring for the blade guard on my Makita
there should be a hole in the housing towards the back of the saw, you can go to Makitatools.com and download a breakdown for this tool.
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