As an Amazon Associate I earn from qualifying purchases.Updated: March 18, 2026
The Battery M18 is the power source for your Milwaukee M18 Circular Saw, providing the energy needed to cut through various materials. Over time, like all rechargeable batteries, its capacity diminishes leading to reduced runtime and power. Delaying replacement can result in frustrating stalling during cuts and ultimately damage to the saw motor.
Check current pricing, reviews, and availability on Amazon.
Function: Provides cordless power to operate the Milwaukee M18 Circular Saw
Signs it needs replacing: Reduced cutting time, noticeable loss of power, difficulty starting the saw
OEM vs aftermarket: OEM batteries offer guaranteed compatibility and performance but are typically more expensive. Aftermarket options can be a cost-effective alternative, but research reviews carefully to ensure compatibility and quality.
Installation: Generally involves simply removing the old battery pack and clicking the new one into place.
Replacement schedule: every 2-4 years
Compatibility warning: always verify part number matches your exact model before ordering
Pros & Cons
Pros
✓ Restores device to original performance without buying a new unit
✓ Significantly cheaper than a full device replacement
✓ Multiple options available from OEM and aftermarket sellers
Cons
✗ OEM parts cost more than third-party alternatives
✗ Wrong part number will not fit — model verification is essential
Common Use Cases
Scheduled maintenance: replacing on the every 2-4 years schedule
Performance restoration after noticing reduced output or efficiency
Preventive replacement before a worn part causes secondary damage
Who Should Buy This
This replacement Battery M18 (48-11-1850) is ideal for owners of the Milwaukee M18 Circular Saw (model 2730-20) who are experiencing decreased performance and want to extend their saw's lifespan.
Not ideal for: If your saw has suffered significant damage beyond battery life, full replacement may be a better option.
Good to Know Before Buying
💡
Always confirm your exact model number (2730-20) before ordering. Part numbers vary between model variants and production years. Check the label on your device or original documentation to be sure.
Frequently Asked Questions
What is the part number for the Milwaukee M18 Circular Saw Battery M18?
The part number is 48-11-1850. Always verify this matches your exact model (2730-20) before ordering, as similar models may use different parts.
How often should I replace the Battery M18 on my Milwaukee M18 Circular Saw?
every 2-4 years
Will aftermarket Battery M18 replacements work in my Milwaukee M18 Circular Saw?
Third-party parts are widely available and often cheaper than OEM. Look for listings that specifically mention compatibility with model 2730-20 and check buyer reviews for fit confirmation before purchasing.
Prices change frequently. See the latest deal on Amazon.