DEWALT DCF845B: problems, parts and running costs

Checked: 2026-10-11

Summary

The DCF845B is the bare-tool version of DEWALT’s 20V MAX XR 3-speed impact driver, rated at 1,825 in-lbs of torque and 3,400 RPM. What usually goes wrong is the purchase, not the tool: it ships without a battery, charger or case, the torque figure is a manufacturer rating with no independent test behind it, and no owner reliability data could be found.

Common problems and fixes

The 4,200 IPM figure is catalog-only — it appears in Grainger’s US catalog listing but not on DEWALT’s own product page or in the manuals checked; treat it as catalog spec, not manufacturer-page spec. [1][4]
Owner reliability data is missing — no readable owner-discussion source was obtainable during research, so long-term failure modes and durability for this model are undocumented. [1]
Mode names vary by seller — Lowe’s titles the same tool “Variable Speed Brushless Cordless Impact Driver” while DEWALT and other retailers say “3-Speed”; both describe the same tool, a variable-speed trigger plus three modes. [1][7]

Parts and consumables

Belt hook — included in the box with the driver; the only accessory DEWALT ships. [1]
TOOL CONNECT chip — the tool is chip-ready but the chip is sold separately; buy it only if tool tracking matters. [1]
Charger (sold separately) — compatible chargers include DCB103, DCB104, DCB107, DCB112, DCB113, DCB115, DCB118, DCB132, DCB1102, DCB1104, DCB1106 and DCB1112. The manual recommends using only DEWALT chargers and charging within the specified temperature range. [1][2]
No wear parts — no bits, filters or consumables are documented for this tool beyond the battery; keep the air vents clear during operation per the manual. [3]

Yearly running cost

$0 in consumables — no filters, refills or subscriptions. The real cost is the separate battery and charger, which are one-time purchases; the research captured no prices for 20V MAX packs or chargers, so a yearly dollar figure is not computable (not enough data). The upkeep rules are free: use only DEWALT chargers, charge within the specified temperature range and keep the air vents clear. [2][3]

When it is a good buy

No street price for the bare tool was captured in the research, so no price threshold can be stated; check live DEWALT and retailer pricing before buying. The value logic from the research: the bare tool is the right buy only if you already own 20V MAX batteries; if you do not, factor in the separate cost of a pack and charger or step up to a kit variant (DCF845P1, DCF845P2, DCF845D1E1E1). Named alternatives from the research: the older DCF885 (1,400 in-lbs class) is the budget pick when 1,825 in-lbs is more torque than needed; the compact DCF850 ATOMIC is the better choice when size and weight matter more than torque; the newer DCF860 high-torque class is the pick when this model’s output is not enough. The 3-year limited warranty, 1 year of free service and 90-day satisfaction guarantee cover the tool itself, not the missing battery and charger. [1]