How we price tools: kit math
Cordless tool pricing hides in configurations. The same tool sells bare, in a 1-battery kit, a 2-battery kit, and holiday bundles — and the "deal" often depends entirely on what the batteries are worth.
So we price every listing as the sum of its parts:
Fair value = tool value + (battery street value × qty) + charger + case
Battery street values come from tracked standalone battery prices per platform and amp-hour (e.g., a Milwaukee M18 5.0Ah has a knowable market value regardless of what kit it ships in). Tool values reflect typical selling prices for the bare tool, not MSRP theater.
Grades compare the actual price to fair value: A = 25%+ below, B = at or below fair value (up to 25% below), C = up to 10% above, D/F = more than 10% above — including "sales" that are worse than buying the parts separately.
The "I already own batteries" toggle regrades kits for buyers on a platform: extra batteries you didn't need count at half value, which is roughly what surplus batteries are worth in practice.
Prices shown carry a "checked" date. If we haven't verified a price recently, we say so instead of showing a stale number. Model version: v0 (July 2026) — value tables are anchored to verified retail prices and refreshed as we track more data.