Maintenance

Maintenance is the act of keeping a vehicle or other machine in top condition. Well-maintained vehicles last longer than average, and may tolerate conditions that a non-maintained vehicle might not withstand.

Battlefield 3

Maintenance
Zoom Optics (MBT, IFV, TD) Air Radar (AA) Extinguisher (AH, SH) Below Radar (Jet) ATACMS Missile (MA) ← → Coaxial HMG (MBT) Thermal Camo (AA) APFSDS-T Shell (IFV) Thermal Optics (AH) Guided Missile (SH, Jet) Zoom Optics (MA) Proximity Scan (TD)
Unlocked at	• 12000 MBT score • 19000 AA, SH, Jet score • 36000 IFV score • 20000 AH score • 3500 MA score • 6000 TD score
Special Feature	• Increased regeneration • Active while in any seat of the vehicle
Vehicle type	• All Vehicles
Customization slot	Upgrade

"Preventative maintenance procedures improve your vehicle's recovery from damage. This is active while in any seat of the vehicle." — Battlelog description

Maintenance is a specialization for all vehicles that increases the rate at which armor regeneration occurs.

This does not have an effect on Hardcore mode as regeneration is disabled. It is mainly used by the gunner in dedicated tank teams, as it is one of a few specializations that carries over to that seat.

Maintenance increases the rate of armor regeneration by 20%.

Archivo:Battlefield 3 Tank Guide - Maintenance

A video about Maintenance in Battlefield 3.

Battlefield 4

Maintenance
Vehicle type	• Attack Boat • Main Battle Tank • Mobile Anti-Air
Customization slot	Upgrade

"Recovery from damage and critical hits starts sooner." — Game description

Maintenance is a vehicle specialization in Battlefield 4.

It has a similar effect to its counterpart in Battlefield 3. It increases the rate of repair in vehicles that are not disabled.