itchyspanner Posted August 10, 2014 Report Share Posted August 10, 2014 hi, i have just got myself a ryobi 18v mitre saw, bare tool. Its going to be used on sites which have no power supply for cutting small timbers like 3x2 for noggin's / supports for pipework, fixtures. I have two good ryobi nicad batts that work the saw, but they are only 1.5ah. What i want to consider doing is making a adaptor to fit the saw that can allow me to use either dewalt xr, milwaukee m18 or makita 18v batteries. Dewalt would be bests as i have more than 10 batts. what problems am i going to face doing such a thing? what battery would be most suitable to use considering they have a type of cell protection on them? any advise would be welcomed, especially if it saves me burning a good battery out trying a fruitless idea. Quote Link to comment Share on other sites More sharing options...
ebowejr Posted August 12, 2014 Report Share Posted August 12, 2014 The only thing i would hesitate about is that now these tools have override protection and alot more communication between the tool itself and the battery that trying to force one battery to work with a different line up of tools might not be the best idea. I'm sure you could eventually get it to work but my concern would be for how long before it breaks. If you can figure this out i would love to see some pics though. 1 Quote Link to comment Share on other sites More sharing options...
itchyspanner Posted August 13, 2014 Author Report Share Posted August 13, 2014 am i right in saying that dewalt has its cell protection in its tools rather than the batts and milwaukee its in the batts? 1 Quote Link to comment Share on other sites More sharing options...
ebowejr Posted August 17, 2014 Report Share Posted August 17, 2014 Well to be honest I'm not sure, I believe the only way it would be possible would be for it to be in the tool and sense the sudden negative acceleration of the bit while the trigger is pulled and then tell the battery to cut power Quote Link to comment Share on other sites More sharing options...
ebowejr Posted August 17, 2014 Report Share Posted August 17, 2014 I take that back, the battery could read full amps coming back and realize that the tool is in override and cut power Quote Link to comment Share on other sites More sharing options...
boschhardware Posted September 15, 2014 Report Share Posted September 15, 2014 I personally prefer Bosch Battery, i am using and i really feel the power!http://www.boschhardware.com/bosch-power-tools/bosch-cordless-tools/bosch-battery-charger/ Quote Link to comment Share on other sites More sharing options...
EEtwidget Posted September 18, 2014 Report Share Posted September 18, 2014 Although I have not taken apart a lot of power tool batteries, I can make an educated guess as to the protection circuit. If I designed the tool, the protection circuit would be integrated into the battery via an IC similar to Texas Instruments bq77910 (integrated battery-protection and cell-balancing solution) This (or similar) IC can handle a majority of the monitoring/control requirements modern LiPo batteries demand. Everything from over-temp, open cell, high peak voltage, undervoltage condition, charging, discharging, etc...A battery is nothing more then a voltage source, the tool should have the voltage regulators and control hardware. Meaning... The tool will have a circuit board that regulates voltage (kicks the battery voltage up/down or converts it into AC, as needed). Usually the tool will have a speed control circuit (PWM or similar) and some other protections/monitoring components that automatically adjust speed in relation to current/temp?.Additionally, your power tool battery-pack is nothing more then a bunch of AA batteries connected together. (A bit more complex but you get the idea) and most power-tool vendors use the same power cells.I would guess that your only real concern is with the mechanical connection. Short of using a 3D Printer to build an adapter .... I'm not sure how you plain to connect a Dewalt batt to ryobi? Quote Link to comment Share on other sites More sharing options...
Tool Whore Posted September 19, 2014 Report Share Posted September 19, 2014 Ryobi has 4.0AH batteries now so you should just get those. Converting your current tools to accept other batteries could be a costly mistake. 1 Quote Link to comment Share on other sites More sharing options...
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