Regeneration

Regeneration in video games refers to the automatic recovery of health, absent other healing items or abilities.

Until Battlefield: Bad Company 2, a player's health could only be restored by medkits (or by defibrillator if killed).

Bandages
Bandages are purchasable items in Battlefield Heroes and Battlefield Play4Free that allow a player to regenerate over a brief period of time. If the player is attacked during the regeneration period, any remaining healing is wasted.

Auto Injector
Similar to bandages, the Auto Injector used in Battlefield: Bad Company's multiplayer has a regenerative effect over time, which is also cancelled if the player receives further damage.

Battlefield: Bad Company 2
BF:BC2 adds health regeneration (similar to that used in titles like Halo or Call of Duty) in both singleplayer and multiplayer. It does not work nearly as fast as a medkit, but allows an isolated soldier to recover.

Battlefield 3
Regeneration returns in BF3, this time including vehicles.

Players can regenerate if they have not been attacked for a period of time. Attacks by enemies—including suppressive fire—halt regeneration. Again, medic kits heal at a faster rate than regeneration alone.

Any vehicle that has not caught fire or been disabled can also recover health. The Maintenance specialization increases the regenerative effect, though still not as fast as can be repaired by an Engineer's Repair Tool.