Lamar Technologies BETA D-50 - Manual (Page 12)

4. DETAILED OPERATING INSTRUCTIONS
28
40 ampere-hours of
26 capacity delivered at
this point
24
22
20
Minimum cutoff voltage (18 volts)
18
16
0 10 20 30 40 50 60 70 80
Discharge time (minutes)
Figure 4-1. Typical discharge curve for 40 ampere-hour
lead-acid aircraft battery
Figure 4-2 illustrates discharge curves for typical SLABs at different discharge rates.
Note that the cell voltage drops much more rapidly at the higher discharge rates, i.e. the
rates at which a greater current is drawn during a shorter period of time.
25.0
12
24.0
20-hour rate
23.0
22.0
21.0 8-hour rate 15-hour rate
12-hour rate
20.0 4-hour rate
2-hour rate
19.0
1-hour rate
18.0
0 2 4 6 8 10 12 14 16 18 20
Discharge time (hours)
Figure 4-2. Typical discharge curves for SLABs at different rates
Page 10 BETA D-50 TESTER / ANALYZER - OPERATING MANUAL V2.2