Page 533 - Battery Reference Book

Sealed lead-acid batteries 50121

Capacity Discharge current Final discharge voltage 1.75 Vlcell
(Ah) (A) (Vlcell)
Cap. Disch.
fh $h 10h 8h 3h lh ih bh 10h 8h 3h Ih 3h ah 8h cwr. 8h
(Ah) (Ah)

5.5 4 1.25 1.51 3.5 8 16.5 24 12.8 1.6
11 8 2.5 3.03 6.9 16 33 48 25.6 3.2
16.5 12 3.75 4.54 10.4 24 49.5 72 ,1870 1865 1840 1800 1730 1665 38.4 4.8
22 16 5 6.05 13.8 32 66 96 51.2 6.4
27.5 20 6.25 7.56 17.3 40 82.5 120 64.0 8.0
33 24 7.5 9.08 20.7 48 99 144 76.8 9.6
44 32 10 12.1 27.4 64 132 192 104.0 13.0
55 40 12.5 15.1 34.3 80 165 240 129.6 16.2
66 48 15 18.1 41.1 96 198 288 ,1870 1865 1840 1790 1705 1630 156.0 19.5
71 56 17.5 21.1 48 112 231 336 181.6 22.7
88 64 20 24.2 54.8 128 264 384 208.0 26.0

92 70 2.5 30.3 66.7 143 277 420 256.0 32.0
111 84 30 36.3 80 172 333 504 307.2 38.4
129 98 35 42.4 93.3 200 388 588 358.4 44.8
148 112 40 48.4 106.7 229 444 672 1865 1855 1830 1785 1705 1620 409.6 51.2
166 126 45 54.5 120 258 499 756 460.8 57.6
185 140 50 60.5 133.3 287 555 840 512.0 64.0
203 154 55 66.5 146.7 315 610 924 563.2 70.4
222 168 60 72.6 160 344 666 1008 614.4 76.8
231 182 70 80.5 163.3 350 693 1092 689.6 86.2
264 208 80 92 186.6 400 792 1248 788.0 98.5
297 234 90 103.5 210 450 891 1404 880.0 110.0
330 260 100 115 233.3 500 990 1560 984.0 123.0
363 286 110 126.5 256.6 550 1089 1716 1080.0 135.0
396 312 120 138 280 600 1188 1872 1176.0 147.0
429 338 130 149.5 303.3 650 1287 2028 1860 1850 1845 1785 1685 1575 1280.0 160.0
462 364 140 161 326.6 700 1386 2184 1376.0 172.0
495 390 150 172.5 350 750 1485 2340 1472.0 184.0
528 416 160 184 373.3 800 1584 2496 1576.0 197.0
561 442 170 195.5 396.6 850 1683 2652 1672.0 209.0
594 468 180 207 420 900 1782 2808 1768.0 221.0
427 494 190 218.5 443.3 950 1881 2964 1864.0 233.0
660 520 200 230 446.6 I 1000 1980 3120 1968.0 246.0

Many types are severely limited by an allowable ,g 100
temperature range of 0-45°C for charging. Charging : 90
to a certain achievable percentage of full charge occurs 8 80
in the freezing range and charging above 45°C is 70
possible only for special types using sintered plate 60
F
construction. E 50
Dryfit batteries should, as far as possible, be stored
in a fully chaxged condition. When stored at an aver- '5 40
-z 30
age temperature of 20°C they need an additional charge 20
after 16 months at the latest, and earlier when stored at g 10
higher temperatures. In general it is advisable to give
an additional charge after storage periods correspond- n. $ 0 -30 -20 -10 0 10 20 30 40 50
ing to about 25% self-discharge. Ambient temperature ("C)
The curves in Figure 50.8 give information regard-
ing the variation of available capacity as a percentage Figure 50.8 Percentage of withdrawable capacity of Dryfit bat-
of nominal capacity (withdrawable capacity) as a func- teries at different temperatures for three load examples. Upper
edge of curve: charging at 2O"C, discharging at quoted ternper-
tion of temperature over the range -30 to +SOT ature. Lower edge of curve: charging and discharging at quoted
for three different loads with continuous discharge temperature (Courtesy of Dryfit)