Last week, my inbox was flooded with emails from customers across Australia asking the same question: “Can I use my old Ryobi battery on my new DeWalt drill?” This surge in inquiries, combined with a viral YouTube video I stumbled upon showing a Melbourne tradie’s workshop fire caused by incompatible batteries, prompted me to address this critical topic.
Why Power Tool Battery Compatibility Matters
As of January 2026, the Australian power tool market is dominated by major brands including Milwaukee, DeWalt, Makita, Ryobi, and Bosch. Each manufacturer designs proprietary battery systems with specific voltage ratings, connection interfaces, and Battery Management Systems (BMS). Using incompatible batteries isn’t just ineffective—it’s genuinely dangerous.
A customer from Perth emailed me describing how he purchased a third-party 20V battery advertised as “universal compatible” for his DeWalt XR drill. Within weeks, the tool overheated during use, damaging both the motor and charger. The repair cost exceeded $400—more than buying a genuine battery.
Understanding the Power Tool Battery Compatibility Chart
Most major brands now publish official compatibility charts. Key points to understand:
Milwaukee M18 System: Works across 200+ tools but incompatible with M12 series
DeWalt 20V MAX: Backward compatible with 20V tools, but 60V FlexVolt batteries offer expanded compatibility
Makita 18V LXT: Compatible across their 18V range; new 40V XGT is a separate system
Ryobi ONE+: Australia’s most affordable option—all ONE+ batteries work with ONE+ tools since 1996
How to Test Power Tool Battery Compatibility Safely
Before purchasing replacement batteries, follow these steps:
• Check voltage ratings match exactly (18V, 20V, 40V)
• Verify physical connector compatibility
• Confirm BMS communication protocols (especially for brushless tools)
• Purchase from authorised Australian retailers like Bunnings or Total Tools
What Is the Best Battery Power Tool Brand for Australians?
Based on 2025 consumer reviews and my customer feedback, Milwaukee leads for professional tradespeople, while Ryobi ONE+ dominates the DIY market due to its extensive backward compatibility and Bunnings availability.
The bottom line: never gamble with third-party “universal” batteries. Stick to manufacturer-approved options—your tools, wallet, and safety depend on it.
