Onoff Posted March 23, 2021 Share Posted March 23, 2021 Mate has an old but heavy duty, 12V Ryobi drill. Originally 12V Nicad. I was looking into making it run on his DeWalt 18V Li-ion batteries. The motor is an RS775VF. From what I can make out they have a nominal voltage of 12V but will operate between 6 & 36V. The switch on the drill says it's good for 20VDC. As I understand it an 18V Li-ion will put out something like 21V. Not sure if this will be an issue? Lastly what I assume is a voltage regulator. On it printed it says "C50/0 99 48 GDS": Just tried running it on an 18V Makita battery and it seemed to run quite happily. Link to comment Share on other sites More sharing options...
Temp Posted March 23, 2021 Share Posted March 23, 2021 Will spin or try to spin faster on the higher voltage. Mostly will work fine but just take care when under high load as there is greater risk of burning out the motor. Link to comment Share on other sites More sharing options...
markc Posted March 23, 2021 Share Posted March 23, 2021 I would give it a go, i reckon you will find it difficult to use due to over speed ... and it probably wont last very long running at silly rpm Link to comment Share on other sites More sharing options...
Onoff Posted March 23, 2021 Author Share Posted March 23, 2021 Seems the switch assembly I was worried about is common to the STP 1201, 1401 & 1801 models so 12/14.4 & 18V. Link to comment Share on other sites More sharing options...
dpmiller Posted March 23, 2021 Share Posted March 23, 2021 it's the power device on the heatsink thad actually drives the motor, the trigger is for reversing and speed control. Link to comment Share on other sites More sharing options...
Onoff Posted March 23, 2021 Author Share Posted March 23, 2021 I'm going to CAD up a DeWalt bottom half to 3D print then graft this to the top of the old Ryobi battery as that's got all the battery contacts in. Link to comment Share on other sites More sharing options...
Gav_P Posted March 23, 2021 Share Posted March 23, 2021 F*** me. You really do find a lot of projects to avoid finishing the house don’t you ? 1 Link to comment Share on other sites More sharing options...
Onoff Posted March 23, 2021 Author Share Posted March 23, 2021 1 hour ago, Gav_P said: F*** me. I'll add it to the list! 1 Link to comment Share on other sites More sharing options...
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