Calculator
How long will your battery pack actually last?
Pick a pack, tool type, and daily use. We'll estimate runtime per charge, cycles until 80% capacity, and what you\'ll spend replacing packs over five years.
Ready to stock batteries that actually last your horizon?
Browse HO, FORGE, and FlexVolt packs in our catalog.
FAQ
How many charge cycles does a Li-ion pack last?+
Standard Milwaukee M18 and DeWalt 20V MAX packs rate for 500-800 full cycles to ~80% capacity. HO / FORGE and FlexVolt packs typically rate 800-1,200 cycles with better heat management. After that they still work but capacity degrades faster.
Does sustained high draw (grinders, rotary hammers) kill batteries faster?+
Yes, meaningfully. Running a standard 5.0Ah pack on a 9A+ sustained-draw tool (grinder, rotary hammer) shortens cycle life by ~30-40% due to heat. HO / FORGE packs are designed for this and degrade ~10-15% under the same load.
Is buying a bigger battery worth the premium?+
If you use high-draw tools (grinders, rotary hammers, saws), yes — the longer runtime per charge plus slower degradation often makes HO / FORGE or 9.0Ah FlexVolt cheaper per watt-hour over 5 years than buying replacement 5.0Ah packs.
What kills a Li-ion pack fastest?+
Deep discharge (running until the tool stops) and heat (leaving packs in a hot truck, charging a hot pack immediately). Both accelerate the internal resistance rise that degrades capacity. Modern chargers refuse to charge a hot pack for this reason.