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TEMPERATURE CORRECTION
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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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EMERGENCY (JUMPER) STARTING
TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 TABLE 2 Specific State of Freezing Gravity Charge Point 1.265 100% -59.50 C (-75°  F) 1.225 75% -37.2° C (-35° F) 1.190 50% -26.10 C (-15°  F) 1.155 25% -15.00 C ( +5° F) 1.120 Discharged -9.40 C (+15°  F) Batteries must be kept fully charged when batteries or vehicles are stored in sub-freezing temperatures. TEMPERATURE AFFECTS BATTERY OUTPUT CAPACITY (CRANKING POWER) Battery  temperature  affects  the  output  capacity  of  a  battery with respect to cranking an engine.  The cranking power of the battery is reduced as battery temperature is lowered. Table 3 lists the approximate percentage of output capacity of a fully charged battery at various temperatures. Note that a fully charged battery at -17.8°  C (0°  F) gives only 40 percent of its cranking power at 26.7° C (80° F). TABLE 3 Temperature Percentage of Battery Capacity (Fully Charged) 26.7 C  (80 F) 100% 0 C  (32 F) 65% -17.8°  C  ( 0°  F) 40% -28.8  C    (-20° F) 20% Batteries at less than the fully charged state will provide even less of their output capacity.  This emphasizes the importance of keeping vehicle batteries fully charged when low temperatures will be encountered. MAINTENANCE (IN VEHICLE) The battery is a perishable item and requires attention.  With a  reasonable  amount  of  care  the  life  of  a  battery  can  be appreciably   extended.      Neglect   and   abuse   will   invariably cause shorter battery service life. The   battery   should   be   inspected   at   the   time   of   chassis lubrication or other periodic services. Battery maintenance includes the following: 1.    Inspect  battery  and  mounting  for  defective  cables,  loose connections, loose or damaged hold down parts, damaged terminal    posts    or    studs,    clogged    vents,    cracked,    or distorted battery case or cover, and accumulations of dirt, moisture and corrosion (Figure 8).  Replace any damaged parts. Fig.  8  Battery Maintenance Inspection 2.    If  corrosion  is  found  on  the  terminal  posts,  remove  the cable terminals from the battery (ground cable first) using the  proper  end  wrench  and  a  cable  puller.    A  terminal cleaning  brush  can  be  used  to  clean  tapered  posts  and the  mating  surfaces  of  the  cable  clamps.    Other  type terminals  can  be  cleaned  with  a  wire  brush.    The  cable terminals should then be cleaned with an acid neutralizing solution  of  baking  soda  and  water.    Clean  dirt  from  the battery  top  with  a  cloth  wetted  with  baking  soda  and water.    Then  wipe  with  a  cloth  with  clear  water.    A  wire brush can be used to remove dirt, corrosion or rust from the battery tray or hold down parts. After  rust  is  removed,  rinse  with  clear  water  dry  with  air and repaint. CTS-2771  Page 8 PRINTED IN UNITED STATES OF AMERICA

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