About this battery system
FLEXVOLT is DeWalt's dual-voltage battery system: packs reconfigure electrically to operate compatible 54V FLEXVOLT tools or 18V XR tools. Capacity labels can be confusing because the amp-hour rating changes with voltage while stored energy remains essentially the same.
Do not calculate energy using 54V × the 18V amp-hour label. DCB546 is approximately 108Wh in either mode.
Manufacturer-supported example specifications below; individual tool fitments and Amazon availability still require checking.
Battery chemistry, cells and energy
DeWalt illustrates five cells in series for 18V, with three parallel strings, and fifteen cells in series for 54V on a 216Wh example; this layout is not a specification for every FLEXVOLT pack.
Energy (Wh) = nominal voltage (V) × capacity (Ah). Divide by 1,000 for kWh. These are nominal estimates, not measured usable energy or guaranteed runtime. A 90Wh pack is 0.09kWh; at an illustrative constant 90W load, ideal runtime would be one hour before losses. Real power tools draw variable power.
| Example manufacturer pack | Capacity | Nominal energy | Amazon UK |
|---|---|---|---|
| DCB546 (18V mode 6Ah / 54V mode 2Ah) | 6Ah | 108Wh / 0.108kWh | Find pack ↗ |
| DCB547 (18V mode 9Ah / 54V mode 3Ah) | 9Ah | 162Wh / 0.162kWh | Find pack ↗ |
| DCB548 (18V mode 12Ah / 54V mode 4Ah) | 12Ah | 216Wh / 0.216kWh | Find pack ↗ |
Technical reference: Manufacturer documentation ↗. Manufacturer specifications are not Amazon price or stock verification.
Choosing a replacement battery
Platform family is an initial research grouping, not a verified fitment for every tool or generation. Check exact tool model, battery part number, connector and charger compatibility. Do not assume matching voltage means interchangeable.
Genuine manufacturer packs
Look for the manufacturer's exact part number, supported charger and capacity in Ah.
Search genuine packs on Amazon UK ↗Third-party compatible packs
Check model-specific compatibility, seller identity, independent safety evidence and warranty.
Search compatible packs on Amazon UK ↗Safety and fitment
Avoid modified adapters and unverified packs; confirm BMS, protection, charging requirements and product safety documentation. Never assume that matching voltage, similar colour or an advertised adapter makes two packs interchangeable. Stop using swollen, damaged or overheating packs.