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The full-indicating pack runs a task far less than a healthy pack.
The pack gets excessively hot, smells, discolors, or stops charging.
The motor can be heard, but the front output remains still in both directions with the bit removed.
Charging begins but never reaches full, or the pack remains unusable.
Power drops in normal handling while the pack shifts or feels loose.
The pack will not slide fully, latch securely, or release normally.
Pressing and holding the state-of-charge button produces no LED indication at room temperature.
A contact is pitted, loose, melted, discolored, or arcs in use.
Temperature delay persists after pack and charger stabilize indoors.
Tool output is much lower with this pack than with a known-good pack.
The cool, fully charged pack starts a verified tool, then shuts it off during a brief no-load or light-load test.
The trigger returns normally and power drops, but the anvil repeatedly coasts instead of stopping promptly.
With no fastener load, the bare or correctly fitted output sounds harsh, binds, knocks, or shakes abnormally.
The direction lever will not reach forward, reverse, or center lock, or the selected position does not hold.
A powered compatible charger shows no response to the seated pack.
The pack is swollen, leaking, hissing, smoking, burning, crushed, wet, or opened.
THE BATTERY WILL NOT SEAT, LATCH, RELEASE, OR STAY SECURE
Two known-good compatible tools give no response with the charged pack.
Stored alone, the pack loses substantial charge without use.
WORKLIGHT COMES ON, BUT THE MOTOR WILL NOT START
FM-01: BATTERY HAS NO OUTPUT IN VERIFIED TOOLS
FM-10: FUEL-GAUGE BUTTON PRODUCES NO LEDS
FM-15: TERMINALS ARE BURNED, PITTED, MELTED, OR ARC
FM-11: FUEL-GAUGE READING IS UNSTABLE OR IMPLAUSIBLE
FM-08: RUNTIME IS MUCH SHORTER THAN NORMAL
FM-03: COMPATIBLE CHARGER SHOWS NO CHARGE RESPONSE
FM-07: POWER IS WEAK UNDER A VERIFIED LOAD
FM-04: CHARGE STARTS BUT NEVER COMPLETES
FM-06: PACK CUTS OUT UNDER A LIGHT LOAD WHILE COOL
FM-09: PACK LOSES CHARGE WHILE STORED
FM-12: POWER IS INTERMITTENT WHEN THE PACK MOVES
FM-16: IMMEDIATE BATTERY SAFETY HAZARD
FM-02: PACK WILL NOT SEAT, LATCH, OR RELEASE
FM-13: PACK BECOMES ABNORMALLY HOT WHILE CHARGING
FM-14: PACK BECOMES ABNORMALLY HOT DURING TOOL USE
FM-05: HOT-COLD DELAY PERSISTS AT ROOM TEMPERATURE
FM-05: FM-05 SPEED WILL NOT VARY, SURGES, OR CUTS ERRATICALLY
fm-3-2: CHARGE-STATUS INDICATOR GIVES NO RESPONSE AFTER A CONFIRMED FULL CHARGE
FM-18: FM-18 A KNOWN-STRAIGHT BIT SHOWS VISIBLE WOBBLE OR RUNOUT
FM-15: FM-15 BATTERY LOSES CHARGE RAPIDLY WHILE STORED DISCONNECTED
Protection and control assembly
Upper and lower battery housing
Slide rails and guide features
Release button and latch
External terminal array
Lithium-ion cell assembly
Damaged-lithium recycling route
Cool known-good Bosch 18V battery
Correct impact bit
Half-inch impact socket
Impact socket
A compatible 12V MAX* battery pack
Gloves
Driver bit or bit holder
Charger and indicator
Mode or torque collar
On-board bit holder
Variable-speed trigger
A straight round-shank drill bit
An approved battery charger