Power-Sonic Sealed Lead Acid Batteries - Technical Manual - Manual (Page 8)

Capacity
Capacity, expressed in ampere-hours (AH), is the
product of the current discharged and the length of
discharge time. The rated capacity (C) of a Power-
Sonic battery (PS, PSH and PSG-Series) is measured
by its performance over 20 hours of constant current
discharge at a temperature of 20°C (68°F) to a cut
off voltage of 1.75 volts/cell.
As an example, model PS-610, with a rated capacity of
1.1 AH will deliver 55mA (1/20 of 1.1 AH, or 0.05C) for
20 hours before the voltage reaches an end voltage of
5.25 volts.
By cycling the battery a few times or float charging
it for a month or two, the highest level of capacity
development is achieved. Power-Sonic batteries
are fully charged before leaving the factory, but full
capacity is realized only after the battery has been
cycled a few times or been on float charge for some
time.
When a battery discharges at a constant rate, its
capacity changes according to the amperage load.
Capacity increases when the discharge current is less
than the 20 hour rate and decreases when the current
is higher.
Rated
Capacity
20 Hour Rate 10 Hour Rate 5 Hour Rate 1 Hour Rate
Amps AH Amps AH Amps AH Amps AH
28.0 AH 1.50 30.00 2.80 28.00 5.10 25.50 18.60 18.60
35.0 AH 1.80 36.00 3.50 35.00 6.50 32.50 27.00 27.00
42.0 AH 2.25 45.00 4.20 42.00 7.20 36.00 25.20 25.20
56.0 AH 3.00 60.00 5.60 56.00 9.50 47.50 33.00 33.00
65.0 AH 3.53 70.60 6.50 65.00 11.20 56.00 39.00 39.00
75.0 AH 4.00 80.00 7.50 75.00 12.90 64.50 45.00 45.00
92.0 AH 4.90 98.00 9.20 92.00 15.80 79.00 55.20 55.20
103.0 AH 5.55 111.00 10.30 103.00 17.70 88.50 61.80 61.80
124.0 AH 6.45 129.00 12.40 124.00 21.30 106.50 74.40 74.40
144.0 AH 7.70 154.00 14.40 144.00 24.08 120.40 84.00 84.00
153.0 AH 8.30 166.00 15.30 153.00 26.30 131.50 91.80 91.80
210 0 AH 11.30 226.00 21.00 210.00 36.10 180.50 126.00 126.00
Table : PG-Series batteries, by industry convention, are rated at their 0 hour rate.
Table 3 shows capacities for various multiples of the 20-hour discharge current for PG models.
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