The main design for early 18V import cordless tools with NiCd batteries had them with two cells in a tower that fit up into the tool, with two side clips on the main bulk if the battery. I also need to complete my mod project to adapt a set of old Chinese 18V NiCd tools to use Ryobi ONE+ batteries. Maybe even one of HF’s own current generation of slide on Li-Ion batteries. What I need to do is make an adapter for the slide on batteries used by an old 18V Harbor Freight reciprocating saw, to adapt to some super common slide on Li-Ion battery. Ryobi ONE+ Lithium Ion batteries have their under-volt and thermal protection self contained because they’re designed for use on their old blue tools that predate Ryobi’s first use of Lithium Ion. Posted in Tool Hacks Tagged adapter, battery powered, power tool, thermistor Post navigation It’s a common enough problem once you start building up a workshop, although you could always avoid it by building all your own tools. Of course, this isn’t the first time we’ve seen somebody adapt batteries from different brands to work on their tools. For most homeowner DIY projects this probably won’t cause a problem, but if you’re a pro who’s really pushing their tools to the limit, this project might not be for you. This will get the tool spinning, but obviously there’s no more thermal protection. His solution to the problem is to “hotwire” the thermistor lead on the battery connector with a standard resistor of the appropriate value. Many tools use thermistors in the batteries for thermal protection purposes, and when the tool doesn’t get a reading from the sensor, it will likely refuse to work. In theory you’d be done at this point, but as points out, there’s a bit more to it than just wiring up the positive and negative terminals. Once the interfaces have been designed and printed, they are wired together and mounted to opposite ends of the center support column. Otherwise, you’ll be spending some quality time with a pair of calipers and a notepad. His goal was to adapt a Milwaukee M12 battery to Makita CXT tool, so if you happen to have that same combination of hardware you can just use his STLs. Note the locking tab that’s been printed separately.Īs explains in the video after the break, the first thing you’ve got to do (beyond making sure the voltages match) is take some careful measurements of the connectors on your batteries and tools. But what do you do if there’s a tool you really need, but your brand of choice doesn’t offer their own version of it? Rather than having to buy into a whole new tool ecosystem, you might be able to design your own battery adapter. Unless you’re particularly fond of having multiple types of batteries and chargers, you’d do well to make sure all your portable power tools are made by the same company.
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