1.5.6 OPEN CIRCUIT VOLTAGE
The open circuit voltage is the voltage of the battery,
without being connected to any units that can provide or
consume electrical power.
1.5.7 DEEP DISCHARGE
The deep discharge is a part of the maintenance process
“Reconditioning” to recover reversible losses of battery
capacity and discharge voltages, which might have been
created in service.
1.5.8 RECONDITIONING
Reconditioning is a process to recover reversible capacity
losses on cells imbalanced during shallow cycling and
discharge voltage reduction by continuous float charge, or
storage.
1.5.9 CAPACITY REDUCTION WHILE THE
BATTERY IS IN SERVICE
The battery capacity can reduce, if the on board charging
voltage is too low. This capacity reduction can be reversed
by battery maintenance.
9
1.5.10 AGEING AND LOSS OF PERFORMANCE
Ageing causes battery’s irreversible losses of energy
conversion. These losses cannot be cured by electrical
treatments. One effect of cell’s ageing is the accumulation
of impurities, and of corrosion products in the electrolyte
and the electrodes of the cells. Any removal of such
effects, by undefined measures is inadmissible.
1.5.11 AIRWORTHINESS
Airworthiness is the compliance of battery component(s)
with all conditions and regulations required by the
approving authorities for their safe operation and
performance.
1.5.12 END OF LIFE CAPACITY.
The end of life capacity of maintained cells is defined as
≤80% of the rated capacity (compare section 1.4.3)
1.6 Technical data
1.6.1 OPERATIONAL PARAMETERS
• Operational temperature range limited from -50°C to 71°C;
• Continuous voltage controlled charges procedures should not be performed above 60°C (battery
temperature)
• Due to potential risk of any ice formation in the electrolyte of the cells should not be charged below -30°C
(battery electrolyte temperature)
• For any specific technical data refer to the relevant DDP (Declaration of Design and Performance) or Technical
Specification which can be requested from the authorised Hawker
®
representative.
1.6.2 TECHNICAL CELL DATA, TABLE 1
Cell designation FP44H1C FP40H1C FP38H1C FP27H1C FP25H1C FP22H1C FP17H1C FP7H1C FP4H1C
Rated voltage. (V) 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2
Electrolyte – density Potassium hydroxide solution, density at 20°C: 1.28 kg/l ± 0.02 kg/l
Thread of upper pole nut M10 M10 M10 M10 M8 M8 M8 M8 M4
Torque of: lower pole nut
Torque of upper pole nut
7 Nm (70 kpcm)
10 Nm (100 kpcm)
4 Nm (40 kpcm)
5 Nm (50 kpcm)
0.9 Nm (9 kpcm)
1.6 Nm (16 kpcm)
Venting pressure Green vents 0.35 ± 0.2 bar;
Venting pressure Blue vents: 0.4 to 0.7 bar
The document reference is online, please check the correspondence between the online documentation and the printed version.
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