Best Battery Adapters for Power Tools: Expand Your Tool Battery Options
Discover practical adapters that let you repurpose existing battery packs to run cordless tools, boost work time, and keep projects moving. This guide highlights five reliable options compatible with popular 18V and 20V systems, including DeWalt, Milwaukee, Makita, and Bauer. Each product includes key features, safety notes, and recommended use cases to help you compare based on compatibility, portability, and power output.
| Product | Brand | Key Use |
|---|---|---|
| LIVOWALNY Real 200W Power Inverter (Dewalt 20V) | LIVOWALNY | Converts Dewalt 20V max to 110V AC; 2 USB & 1 Type-C |
| LIVOWALNY Real 200W Power Inverter (Milwaukee 18V) | LIVOWALNY | Converts Milwaukee M18 to 110V AC; portable power station |
| aikeec Battery Adapter for DeWalt to Milwaukee | aikeec | Adapter from DeWalt 18V/20V to Milwaukee M18 tools |
| TANHEYIN 2 Packs Adapters for Makita 18V | TANHEYIN | Makita 18V to various power wheel and DIY uses |
| Azocek 220W Inverter for Milwaukee 18V | Azocek | Converts Milwaukee 18V to 110V AC; USB & Type-C fast charge |
LIVOWALNY Real 200W Power Inverter for Dewalt 20V
This 200W DC 20V to AC 110V inverter is designed for Dewalt 20V max lithium batteries. It supports peak power up to 250W for brief surges and provides two USB ports plus a Type-C output alongside an AC outlet. It is positioned as a portable power station for outages or outdoor use, enabling continued operation of phones, laptops, tablets, cameras, lighting, and small electronics. Battery is not included and must be provided by the user.
LIVOWALNY Milwaukee 18V to 110V Inverter
Compatible with Milwaukee M18 batteries (e.g., 48-11-1820, 1822, 1840, 1850, 1860). Delivers 200W continuous output with peak 250W, plus 2 USB ports and a Type-C PD charger. As with any adapter, users should follow proper battery handling: remove battery when not in use and avoid charging through the adapter. This option targets Milwaukee users seeking a compact, battery-powered AC source for on-site work or travel.
aikeec DeWalt to Milwaukee Battery Adapter
Adapter converts DeWalt 18V/20V lithium batteries to fit Milwaukee M18 tools. It notes that it does not support charging or high-output tool requirements and should be used with the battery disconnected from chargers when in use. Includes a built-in battery lock and protective PCBA. It is designed for powering Milwaukee tools on DeWalt packs, enabling reuse of existing batteries to extend tool run time for compatible devices.
TANHEYIN Makita 18V Battery Adapters (2 Pack)
These adapters are designed to fit Makita 18V batteries into power wheel setups and other DIY projects. They feature a 30 Amp fuse protection and 12 AWG wiring for safe operation, along with a secure locking mechanism to prevent unplugging during use. The kit is suitable for converting Makita packs for use with RC toys, DIY rigs, or similar low-to-mid-power applications, though batteries are not included.
Azocek 220W Inverter for Milwaukee 18V
Specifically designed for Milwaukee 18V batteries, this 220W inverter converts DC to 110V AC with a single AC outlet and two USB ports plus a PD Type-C fast charge. It provides a practical option for lightweight outdoor tasks and emergencies, enabling simultaneous device charging while powering small tools. Battery not included, and users should verify tool compatibility before use.
Buying Guide: Key Considerations for Battery Adapters
When selecting a battery adapter for power tools, consider compatibility, power output, and safety features. Ensure the adapter supports your tool’s voltage (18V, 20V, etc.) and the battery chemistry. Look for continuous wattage versus peak power to gauge real-world performance during load surges. Pay attention to USB and Type-C ports for peripheral charging, and check for built-in protections such as over-current, short-circuit, and battery lock features. If you need portability, prioritize lighter, compact units with efficient heat management. For DIY or specialized uses, assess compatibility with specific tool brands and battery packs, and note any charging restrictions or required battery handling practices. Finally, confirm whether the battery itself is included or must be provided separately and plan for safe storage and transport of Li‑ion packs.
Overview of selection criteria by use-case:
- Outdoors/remote sites: prioritize durable enclosures, longer cable runs, and higher peak power handling.
- Small electronics and charging: prioritize USB-C PD, multiple ports, and compact form.
- Heavy tool operation: verify peak and continuous power ratings match tool demand and include battery safety features.
- Budget constraints: compare per-tool compatibility and consider multi-pack kits for broader versatility.