Page 526 - Battery Reference Book

50/14 Lead-acid (secondary) batteries
Table 50.12 Range of flat plate type engine starting batteries supplied by Chloride Power Storage

Number of plates 9 13 21 25 13 17 25 33
Capacity at 20°C (Ah) at 5 h rate 62 92 154 185 118 158 236 315
Charge current (A)
Starting 12 18 31 37 24 32 47 63
Finishing 4 6 10 12 8 11 15 21
Current for 30 s to 1.33 V p.c. at 0°C
cell 25% discharged 3 60 534 893 1073 620 830 1239 1654
Cell weight complete (kg)
Filled 7.7 10.7 17.2 20.2 12.7 16.8 23.8 30.8
Acid only 1.3 1.9 3.0 3.6 2.3 2.9 4.2 5.5
Approx. quantity of acid (litres) 1 .os 1.50 2.36 2.82 1.77 2.27 3.32 4.36
Cell dimensions (mm)
Length 62 86 135 160 86 111 160 208
Width 159 159 159 160 159 159 160 160
Height 283 283 283 283 321 321 321 321
One-cell tray*
Length (mm) 102 126 175 200 126 152 200 246
Width (mm) 200 200 200 200 200 200 200 200
Layout A A B B A B B B
Centres (mm) 108 132 206 206 132 206 206 206
Weight (kg) 9.7 13 19.9 23.2 15.3 19.7 27.2 34.7
Four-cell trayr
Length (mm) 164 212 212
Width (mm) 360 360 360
Layout G G G
Centres (mm) 170 218 218 -
Weight (kg) 34.8 47.4 56 - -
Tray height (mm) 272 272 272 310 310 310 310
Overall height (mm) 350 350 350 388 388 388 388
Height over end cell take-offs (mm)

* Two-cell and three-cell versions are also produced
' Monobloc units in excess of 60 kg must be accommodated on stillages only

navigation lights and many other ancillary services on series of low-maintenance cells. The batteries are
ocean-going vessels. They are used also to provide housed in flame-retardant cases. In Powersafe cells the
power for communications and emergency services overcharge reaction is controlled using the principle of
on smaller craft such as inshore trading vessels and gas recombination. This means that the gases normally
pleasure boats. evolved during the flathecharge operation in conven-
There are slight variations in the construction of the tional lead-acid cells recombine to form water in the
three types of battery that Chloride offer for marine Powersafe cell. Consequently, for all practical pur-
applications, to ensure that each battery matches the poses, Powersafe products lose no water during normal
demands of its duty (Table 50.13). operation and therefore topping up is not required.
A new addition to the Chloride Power Storage Gas-recombining cells contain a special highly
range of flat-plate standby batteries is the Powersafe porous glass microfibre separator through which