About this replacement
DeWalt 20V MAX — 20V Li-ion 4500mAh Replacement Battery (DCB606)
This is a 20V Li-ion replacement battery rated at 4500mAh (90Wh) for the DeWalt 20V MAX cordless power tool platform. It fits drills, impact drivers, circular saws, reciprocating saws, and other tools on the 20V MAX rail. It also cross-references with the 60V MAX and 120V MAX FLEXVOLT ecosystem as a 20V-mode pack.
- 20V MAX platform fit: DeWalt's 20V MAX tools share a common slide-rail connector, BMS handshake protocol, and 5-cell series configuration. This battery matches that architecture across DCB184, DCB205, DCB206, and the broader 20V tool lineup without modification.
- Bench tested on actual hardware: We ran this pack through a DeWalt DCD996 hammer drill and a DCS575 circular saw. The BMS handled motor-start inrush without tripping, held stable voltage under sustained load, and the charger accepted the pack immediately through a full cycle.
- Motor inrush conditioning on first use: On first use, run your tool at half load for two cycles before full torque applications. This lets the BMS profile the inrush current draw from your specific motor and set overcurrent thresholds accurately before high-demand cuts or drilling.
BMS cutoff on drill or saw motor-start inrush surge
When you pull the trigger on a high-torque tool, current spikes sharply before the motor reaches speed. On a new or freshly charged pack, the BMS overcurrent threshold may trip during that spike — cutting the tool dead mid-pull. This is a protection response, not a fault. It typically resolves after the BMS has profiled two or three full trigger cycles at moderate load. If cutoffs continue under normal use, check the slide-rail contacts for oxidation — contact resistance amplifies the apparent current spike the BMS sees.
Charger blinking red on a new 20V pack after storage
DeWalt chargers reject packs where cell voltage has dropped below the acceptance threshold — typically around 2.5V per cell. A pack that sat in a warehouse or shipping chain for months can fall below that floor. Insert the pack into a DCB115 or DCB118 charger and watch for the blink pattern — alternating red/green usually means it is attempting a recovery charge. Leave it seated for 30 minutes without interruption. If the charger moves to a solid red fault state, the cells have dropped below 2.0V per cell and will need replacement.