My dewalt drill won't switch to hammer

tight bearing maybe

Your problem states you have a Makita tool and your question is about a Dewalt lithium battery. In either case if the battery won't take a charge or if the charger is showing the battery is defective the only fix is to replace the battery. Some causes for defective batteries or batteries that won't take a charge are bad cells in the battery, bad or shorted IC board in hte battery, broken or burnt connections between the many cells or between the cells and IC board or even bad or old cells that will no longer charge up. The time and effort needed to find out what the problem is then finding another battery to scavenge parts from (individual battery parts are not available) is never worth the cost of just buying another battery and going back to work with the tool(s).

Go to the Dewalt service website at http://servicenet.dewalt.com, put the model number in the parts search box and you'll be able to view or download the parts breakdown and owner's manual. By the manual that model does have three modes; a hammer only, drill only and hammer/drill.

DeWalt says:
Number of drilling modes
3 modes. Rotation only, hammering with rotation, or hammering only with rotation stop for light chiselling applications in tiles and plaster and impact stop mode for rotary drilling only in wood and steel.
Maybe yours is doing the second one?

The hammer inside the drill head are most likely damaged ans/or broken, it is likely the best thing to do is just replace the tool.

Please visit a qualified technician. Because it's also my personal experienced with hammer drill that inside a small ball bearing with tiny spring as a tosser for shifting always been stocked up by sticky or hardening grease which you need to loosen. If not kindly check it up for something that is blocking the shift. Thanks for asking.

Go to this LINK and find the part/diagram that can help you.

Please thumbs or post back,thanks

Schematic from a dealer for converting an old type 1 switch on DW-505 hammer drill a to the new switch.

You may have inadvertently hit the hammer/drill switch and it is floating the middle between functions. This selector switch has a symbol showing a drill bit on one side and a symbol of the hammer on the other. Engage the switch bacK into the drill position

it more than likely needs a new switch, to to Dewaltservicenet.com and you can download a breakdown with parts list.