Dell Latitude C400 Battery Li ion Rechargeable Li-ion Battery (Rating: 11.1V - 3600 mAh - 48 Whr).
The Dell P/N is 4E368, 4E369, 00J256, 312-4609 or equivalent.
This battery fits Latitude C400 notebooks only.
Dell Smart Lithium-Ion Primary Battery has internal circuit board with
chips that allow it to communicate with the notebook to monitor battery
performance, output voltage and temperature. It also gives the notebook
much more accurate 'fuel gauge' capability to determine how much
battery runtime is left before the next recharge is required.