Top 10 safety tips for reliable aircraft battery performance

Here are the most important steps to take to keep your airplane battery reliable and your flights safe.

#1: Perform regular capacity testing

Why: Avoid relying exclusively on surface voltage, which can appear normal even while the airplane battery collapses under load.

What to do: Capacity-test using the maintenance manual as a guideline.

#2: Watch for parasitic loads and early indicators of failure

Why: Hot-battery monitoring and alerting system draws from avionics, USB ports, and displays cause gradual and repeated shallow discharges.

What to do: Isolate circuits and use an ammeter to find drains. Fix wiring and regulator faults rather than repeatedly replacing batteries, and use a parasitic tester to verify loads.

#3: Use lead-acid battery maintainers properly and avoid automotive chargers

Why: Automotive maintainers may float at voltages that harm sealed absorbent glass mat (AGM) cells.

What to do: Use aviation-rated maintainers. If the aircraft sits for around 30 days, apply a maintainer for about two days within that period, adjusting for parasitic loads. Follow the technical bulletin for further instructions.

#4: Respect voltage range and regulator settings

Why: Both chronic undercharging and overcharging can shorten service life.

What to do: For 12-volt systems operating between 87°F and 113°F, the recommended charge voltage is 13.8-14 volts. For 24-volt systems within the same temperature range, the recommended charge voltage is 27.5-28 volts. When authorized, voltage regulators should be adjusted seasonally to account for temperature changes. Refer to the owner/operator manual for complete charge voltage recommendations across the full operating temperature range.

#5: Plan for temperature extremes

Why: Temperature extremes can impact airplane batteries. Elevated temperatures increase self-discharge rates, accelerating battery degradation, whereas cold temperatures reduce cranking performance and available capacity.

What to do: Anticipate faster voltage reduction in hot climates and mitigate with supplemental charging when the state of charge drops below 75%. Use hangars or heater blankets in cold environments to maximize performance. Remove batteries for warm storage if needed.

#6: Never use jump starts as a routine fix

Why: Ground power can start the engine but may not restore enough charge for relays and charging to function in flight.

What to do: Fully charge or replace weak airplane batteries before flight. If ground power is used, verify relays and charging operation.

#7: Know signs of sulfation and how to respond

Why: Sulfation on lead-acid batteries can cause misleading voltage levels and poor performance. Open-circuit voltage and battery state of health are not the same.

What to do: Attempt a controlled conditioning charge and then capacity-test. Replace the aircraft battery if capacity cannot be restored.

#8: Standardize cockpit flows and use checklists

Why: Human factors can cause missed switches and overlooked alternator items.

What to do: Group battery and alternator controls logically in cockpit flows, then use checklists to trap errors. Train crews to use checklists for abnormal electrical indications.

#9: Plan logistics for remote operations

Why: Airplane batteries and service can be scarce in remote locations.

What to do: Carry spares, pre-identify support contacts, and/or install an external charging connector for field servicing.

#10: Monitor the operational profile and adjust maintenance frequency

Why: Many short hops that never fully recharge the battery accelerate sulfation and shorten aircraft service life.

What to do: Capacity test frequency is determined by the result of each test. Follow the maintenance manual instructions on capacity tests accordingly. Adjust the battery maintainer usage per the technical bulletin.

Early planning can prevent many battery-related emergencies

Short flights, cold starts, and hot storage all change how quickly airplane batteries lose capacity. Know how your mission affects the battery and adjust testing and use of maintainers accordingly.

In flight, be sure to:

• Aviate-navigate-communicate
• Use normal procedure checklists
• Follow the aircraft’s electrical checklist
• Shed the nonessential electrical load
• Divert if charging cannot be reliably restored

On the ground, avoid treating jump starts as permanent fixes. Instead, fully charge, condition, or replace, and verify capacity before returning the airplane to service.

Make aircraft battery care part of your safety culture

Properly functioning airplane batteries are critical. Embedding battery care into your safety culture is one of the best ways to ensure smooth operations.

To do this effectively:

• Schedule capacity tests based on mission and environment
• Use aviation-specific maintainers
• Add external charging points if access is difficult
• Be conservative at night, in instrument meteorological conditions, and with remote operations
• Monitor electrical system and battery performance during all phases of flight

Thinking several moves ahead about charging, storage, parasitic loads, and replacement logistics turns the airplane battery from a potential failure point into a mission-critical safety margin.

For more information on aircraft battery calibration, repair, and services, go to Boeing Battery Repair Services.

Need a battery? Visit Boeing Distribution to find Concorde batteries and other approved batteries for airplanes.