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The BDF452HW has a carbon brush motor - and they do eat up brushes quickly. The brush set number is CB440 - they are replaceable by removing the 2 screws on the rear cap, the connectors snap over the brush holder - take care not to bend the brush holders when changing, they are just thin brass.
If the tool is 'ticking' or 'grinding' when it spins check the condition of the armature before you install new brushes - the copper commutator should not look burnt or have raised segments - this is also a common repair on this tool. Replacing the armature is a fairly inexpensive and easy fix - you must split the entire clamshell housing to access this - be sure to fit all the components securely back into their slots or you may tear all the fan blades off the armature when you try and run it.
Pull the brushes out and make sure they are in good shape. Sping the motor by had then put the brushes back in and see if it works. Often times the brushes get blocked by wood dust. If not check the power cord and switch for continuity.
I checked a couple sites and would suggest calling RYOBI parts supplier at 1-877-545-4099 to ensure that you get the correct charger. They might ask you what the model nnumber and the voltage and type of battery so have these numbers handy. Let me know if you need more assistance.
new Ryobi have a spindle lock button, it is unobtrusive and you may miss it
If yours does not, secondhand etc, a screwdriver in the blade teeth between the upper and lower guards provides a locking bar enough to undo the arbor bolt