Dell Latitude 131L Replacement Battery 11.1V 6600mAh KD476

Dell Latitude 131L / Inspiron 1501 — 11.1V Li-ion Replacement Battery (KD476)

This 11.1V, 6600mAh (73.26Wh) lithium-ion battery replaces the original cell in the Dell Latitude 131L, Inspiron 1501, Inspiron E1505, and Vostro 1000. It cross-references OEM part numbers including KD476, GD761, 312-0428, UD267, and several others listed below. If your current battery no longer holds a charge or your laptop won't run unplugged, this cell restores portable power.

• Multi-model fit across the 131L and Inspiron E1505 platform: These models share the same 11.1V battery bus, identical connector pinout, and the same BMS handshake protocol — which is why one part number covers all of them. The BIOS battery authentication sequence is identical across this platform generation.
• Bench tested on actual hardware: We ran this cell on a Latitude 131L and monitored the BMS charge cycle from 0V recovery through to full 12.6V charge termination. The protection circuit tripped correctly at low-voltage cutoff and accepted a full charge without error codes or BIOS rejection flags.
• Post-install discharge cycle on Dell systems: After fitting this battery, run the laptop down to hibernate cutoff on battery power alone, then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to reset against the new cell's actual capacity and clears the inaccurate health warning that appears after every cell swap on Dell Latitude and Inspiron systems.

BIOS reporting poor battery health immediately after replacement

Dell's BIOS stores battery health data in EEPROM on the old cell. When a new cell is fitted, the BIOS has no learned data for it and flags the battery as degraded or unknown. This is not a fault with the replacement — it is the BIOS reacting to a blank state. Running one full discharge-to-hibernate followed by an uninterrupted charge to 100% forces the learn cycle. After two to three cycles, the BIOS health indicator will update to reflect the actual cell capacity.

Laptop shuts down abruptly at 20–30% charge shown on screen

This happens when the cell voltage drops sharply under the combined load of the CPU, display backlight, and hard drive spin-up — what engineers call a voltage cliff. The fuel gauge IC still reads 20–30% capacity, but the actual cell voltage has already fallen below the BMS cutoff threshold under load. It is common in aged cells where internal resistance has increased. Replace the cell and run two full calibration cycles; the fuel gauge IC will then map its percentage readings accurately against the new cell's actual discharge curve, typically resolving unexpected shutoffs.