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Hawker AeroBatteries Aircraft Technical Specifications

Hawker®  AeroBatteries are very different from standard liquid-acid batteries that are openly vented. A Hawker® AeroBattery operates with minimal gas generation and high gas recombination. As a result, there is no corrosion of the positive terminal or corrosion to the surrounding area. Hawker® AeroBatteries are shipped fully charged from the factory, but prior to installation, check the battery's voltage to see if it is 12.65 volts or greater. If not, recharge it using the procedure below.

Pure Lead Advantage

Hawker® AeroBatteries last longer, charge faster, and have higher cranking amps than any of it’s competitors! How??


Pure Lead is the absolute key element in the world's most advanced AGM Drycell Battery. Hawker® AeroBatteries' pure lead plates, grids, and cell connectors have much lower resistance to current than lead alloys typically found in lead acid batteries. Lower resistance and thin plates work together to provide the rapid charge capability and higher cranking amps. When a battery is constructed of pure lead and laboratory grade acid you have essentially eliminated the most common cause of early battery failure, internal corrosion.  Eliminating internal corrosion by using pure lead means long battery life.

High Cranking Amps

Power. Lots of it!! If your Cranking Battery doesn’t have cranking amps, what good is it?  Hawker® AeroBatteries deliver serious cranking amps  -  up to 60% higher than conventional lead acid batteries! In fact the first 5 seconds of power from a Hawker® AeroBattery packs 3- 4 times more punch than any comparably sized lead acid battery made!

The secret is pure lead. Thin pure lead plates and lower internal resistance combine to provide a surge of current that provides the power your starter has been craving!

Shock & Impact

The Hawker® AeroBattery has been subjected to several tests that prove their high resistance to shock and vibration.
(A) MIL S-901C shock, high impact test
This is a test specified by the US Navy to determine suitability of equipment to be installed on warships. A 26Ah battery was installed in an UPS system aboard a Navy MHC51 class coastal mine hunter.

The object of this test is to simulate the shock generated by a 16-in. naval gun and a depth charge going off simultaneously. Testing is performed by hitting the UPS, while in operation, with a 2,500 lb. hammer from varying distances. After several such impacts the battery system was load tested for proper functioning.

The 26Ah battery passed the test without metal jackets. 
The Hawker® AeroBatteries equipped with metal jackets and aviation-grade terminals will only increase their ability to withstand harsh shock and impact situations that may be encountered in automotive applications.

(B) MIL S-167-1 for mechanical vibrations
The Drycell™ batteries were subjected to three classes of vibration — exploratory vibration, variable frequency and endurance test.

Exploratory vibration test: The UPS unit containing the battery was vibrated from 5Hz to 33Hz at a table vibratory single amplitude of 0.010 ± 0.002 in., in discrete frequency intervals of 1Hz. Vibration at each frequency was maintained for 15 seconds.

Variable frequency test: The UPS unit was vibrated from 5Hz to 33Hz at 1Hz intervals at different amplitudes. At each frequency the vibration was maintained for 5 minutes.

Endurance test: The test was conducted at 33Hz for two hours in the x-and y-axes at a table vibratory double amplitude of 0.010 ± 0.002 in. The z-axis endurance test was conducted at 33Hz for two hours at a table vibratory single amplitude of 0.020 ± 0.004 inch.

(C) Three axis vibration test
This test was conducted for Hawker Energy Products Inc. by an independent test facility. Two batteries, equivalent to the AB 26  and AB 40 were mounted in a special fixture and tested in the following manner:
Deep Cycle

A Hawker® AeroBatteries is not a deep cycle battery; it is THE deep cycle battery!

Hawker® AeroBatteries have deep cycle capabilities that far exceed those of any other battery. Think your heavy duty, deep cycle battery with its thick plates, slow charge rates and low cranking amps deep cycles better?  Not a chance!  Those thick plates help the battery withstand the high temperatures created during deep discharge of a typical lead acid battery, but this is a remedy not a solution.

The Hawker® AeroBattery has very low internal resistance, and lower resistance means less heat. The Hawker® AeroBattery may be discharged to 20% of its rated capacity, and immediately recharged up to 108% of capacity, up to 400 times!

Try this with your typical deep cycle battery and let us know if it makes 150 cycles! (Most deep cycle batteries are rated to 150 cycles to 80% depth of discharge.)


A critical factor in the proper use of a rechargeable battery is charging. Inadequate or improper charging is a common cause of premature failure of rechargeable lead acid batteries.

To ensure proper charging of your premium Hawker®  Aerobattery, EnerSys has developed a special charge algorithm that is designed to rapidly and safely charge these batteries. Called the IUU profile (a constant current mode followed by two stages of constant voltage charge), the following diagram shows it in a graphical format. No manual intervention is necessary with chargers having this profile.
Idealized Schematic of IUU Profile at 25ºC (77ºF)


For any rechargeable battery, storage and recharge are important criteria, and this section develops some useful guidelines that should be followed.

(A) How do I know the state of charge of the battery?

Provided the battery has not been charged or discharged for at least five (5) hours, one can use the following graph to determine the state of charge (SOC) of the Hawker® AeroBattery by simply using a good quality digital voltmeter to measure its open circuit voltage (OCV).

The graph below indicates that a healthy, fully charged Hawker® circuit voltage of 12.84V or higher at 25ºC

The open circuit voltage (OCV) numbers on this graph are applicable only if the battery has not seen any activity (charge or discharge) for at least a few hours before voltage measurements are taken.

(B) How long can the battery be stored?

The next graph shows the remarkable storage properties of the Hawker®   AeroBattery.  At a storage temperature of 25°C, one can store these batteries for up to two (2) years. As the graph illustrates, the lower the storage temperature, the longer the storage time.

The graph also illustrates the large impact of temperature on storage — for every approximately 10°C (18°F) increase in temperature the storage time is cut in half. Thus, although the Hawker® AeroBattery may be kept on the shelf for two years at 25°C (77°F), if the temperature rises to about 35°C the battery may be stored for only one year before it needs a recharge.

The numbers on this graph are applicable only if the battery is fully charged before being placed on storage.

(C) Can the battery recover from abusive storage conditions?

The short answer is yes, the Hawker® AeroBattery can recover from extremely deep discharges as the following tests demonstrate.

(1) German DIN standard test for overdischarge recovery

In this test, a charged  Hawker® AB 26 battery was fully discharged over 20 hours (0.05C10 rate) to 10.20V. After the discharge was complete, a 5W resistor was placed across the battery terminals and it was set aside for 28 days.

At the end of 28 days’ of storage, the battery was charged at 13.5V for only 48 hours. Another 0.05C10 discharge yielded 97% of rated capacity, indicating that a 48-hour charge after such as deep discharge was not sufficient; however, the test is designed to show whether the battery can be recovered from extremely deep discharges using only a standby float charger. A standard automotive charger at 14.4V would have allowed the battery to recover greater than 97% of its capacity.

The results of this test prove rather conclusively that Hawker® batteries can indeed recover from very abusive storage conditions. This conclusion is further reinforced by the following test which is even harsher than the DIN standard test due to the fact that the battery was stored in a discharged state at a high temperature of 50°C or 112°F.

(2) High temperature (50°/112°F) discharged storage test

In this test two Hawker® AeroBattery samples were discharged at the 1-hour rate to 9V per module, then set aside for storage at 50°C (112°F) in a discharged condition for four weeks.

At the end of four weeks, the two batteries were recharged using a constant voltage (CV) charger at 14.7V per battery. As the graph below shows, both samples were able to recover nicely from this extreme case of abusive storage.
Recovery from high temperature (50°C) discharged storage
(Constant voltage recharge at 14.7V per module)


Sealed Rechargeable DrycellTM - Deep Cycle Batteries


Because the Hawker® Aerobattery has no free acid inside, it is exempted from the requirements of 49 CFR § 173.159 of the US Department of Transportation (USDOT). The battery also enjoys a "nonspillable” classification and falls under the International Air Transport Association (IATA) "unrestricted” air shipment category. These batteries may be shipped completely worry-free. Supporting documentation is readily available.
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