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Yes—you can use a cordless-tool battery to charge a phone or other USB device, but you need a purpose-built adapter made for that exact battery platform. Match the adapter to the battery family, check the adapter’s output and port limits, and follow its manual. A battery’s voltage by itself does not establish compatibility.
Choose an adapter for your exact battery platform
Tool batteries are not interchangeable just because their voltage labels look similar. Start with the battery’s brand and platform—such as Makita XGT, CXT or LXT, or Bosch 18V Li-ion—and confirm that the adapter manufacturer lists your battery model as compatible. Do not force a connection or rely on a generic connector.
These examples show why platform names matter. Specifications below are manufacturer-stated; they are not independent charging-speed or runtime test results.
| Battery platform and adapter | Manufacturer-stated outputs and functions | What to check |
|---|---|---|
| Makita 40V max XGT, ADP001G | Two USB-A ports, rated at 2.4A each and 4.8A total; USB output shuts off automatically after 30 minutes. | Listed as a power-source tool only; battery and charger are not included. Makita ADP001G specifications. |
| Makita 12V max CXT, ADP06 | One USB output rated at 2.1A. | This is a CXT example, distinct from Makita XGT and LXT. Makita ADP06 specifications. |
| Makita 18V LXT, TD00000111 | 5V USB output rated at 2.4A. | Makita lists compatible LXT battery models and says to use genuine Makita batteries and chargers. Makita TD00000111 specifications. |
| Bosch 18V Li-ion, GAA18V-48N | Two USB ports, up to 2.4A per outlet, plus a 12V DC output. | This is for the Bosch 18V Li-ion platform; do not confuse it with Bosch POWER FOR ALL. Bosch GAA18V-48N specifications. |
| Bosch 18V POWER FOR ALL, UniversalUSB 18V-45 | USB-C and USB-A; Bosch states combined output of up to 5V/3A plus 5V/1.5A. | Bosch lists alliance compatibility. Battery and charger are not included. Bosch UniversalUSB 18V-45 specifications. |
| FLEX 12V/18V, PS2 CA 12/18 | USB-A output at 5V, up to 12W; USB-C output up to 60W with 18V batteries and 45W with 12V batteries. It can also charge compatible packs from a USB-C mains adapter. | FLEX lists overheating, discharge and overload protection. Confirm the pack and output requirements in the product information. FLEX PS2 CA 12/18 specifications. |
| CRAFTSMAN V20, CMCB002B | One USB port rated at 2.1A. | Battery and charger are sold separately. CRAFTSMAN explains that “20V MAX” is maximum initial voltage; nominal voltage is 18V. CRAFTSMAN CMCB002B specifications. |
Compare output, ports and what is included
Once you have found an adapter for your platform, check whether it has the connector your device accepts: USB-A, USB-C, or both. Then read the rated voltage and current or power for each port. If you plan to charge two devices at once, look for a stated combined-output limit; a per-port maximum does not necessarily mean every port can deliver its maximum simultaneously.
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Port ratings describe the adapter’s specified output, not a guaranteed charging rate for every phone or accessory. The device, cable and adapter all affect charging behavior. The product specifications above do not establish real-world charging times or how long a particular battery will run the adapter.
Check the box contents before buying. Some sources explicitly describe an adapter as tool-only or state that its battery and charger are not included. If you do not already own a compatible battery and charger, account for those separately.
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Use the adapter as designed
Use a purpose-built adapter and its own manual. Do not improvise wiring, expose battery cells or substitute a generic connector: compatibility includes the battery interface and protection behavior, not just voltage.
For the Makita ADP001G, the Canada instruction manual says to connect only devices compatible with DC 5V, 2.4A, keep nails, wires and other conductive objects out of the USB port because a short can cause smoke or fire, and remove the battery after charging or during storage. These are model-specific instructions, so consult the manual for whichever adapter you use: Makita ADP001G instruction manual.
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Decide whether this is the right charging setup
A battery-platform adapter is useful when you already own compatible tool batteries and want a portable USB source at a jobsite or elsewhere without a wall outlet. It is not a universal battery converter. Before connecting anything, confirm the exact battery model, the adapter’s compatibility list, its port ratings, and any simultaneous-output limits in the manufacturer’s current product information and manual.
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