Sounds like your battery is sucking the power as a heater... Disconnect it ( the battery ). Rick is correct that drill barely turns at 1Amper that is 1000 ma and will draw 8 to 15 Amps under full load.. A
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My batteries are dead, I'm trying to convert my drill into a power drill. The DC converter I bought must not have enough power at full load. The batteries labeled 2.6ma but it must put out more amps.
I think your drill wants more power. The last time I tried this trick, i.e. powering a cordless drill with a DC supply other than that drill's battery, I think it wanted about 6 to 8 amperes, while mechanically loaded. In fact I made some notes, and took some pictures of this voodoo, and I posted those pictures and notes here:https://www.instructables.com/answers/Power-a-cordless-tool-with-a-wall-socket/?comments=all#CAMTHXDH0KKJ63Y The direct links to the big-sized pictures are here:https://www.instructables.com/file/FXRNIPRH0KKFXYP/https://www.instructables.com/file/FNBPFAAH0KKW71I/https://www.instructables.com/file/FGVV8KEH0KKFXYN/https://www.instructables.com/file/FKHIHH6H0KL0KOF/https://www.instructables.com/file/F51PZFDH0KKW71H/https://www.instructables.com/file/FRW743EH0KL7DNK/https://www.instructables.com/file/FJVEPM8H0KL7DNL/https://www.instructables.com/file/F192SF1H0KKFXYO/https://www.instructables.com/file/F2KKB6MH0KKJ61S/https://www.instructables.com/file/F3G82BMH0KKJ61T/https://www.instructables.com/file/FNKX3YYH0KKW71J/
Does the drill run normally on it's own battery?2.6 mA ( I assume you don't mean Mega Amps (MA)!) is very little for a cordless drillI would expect it to draw Amps when in use. this would explain why your mA power supply won't turn it the power supply is current limiting.