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BATTERY CHARGING GUIDE
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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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REMOVAL AND INSTALLATION - TM-5-4210-230-14P-1_466
TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 SLOW CHARGING The   Slow   Charge   method   uses   a   low   charging   rate   for   a relatively long period of time.  The recommended rate for slow charging  is  one  ampere  per  positive  plate  per  cell.    If  the battery has nine plates per cell, normally four of the nine will be positive plates.  Therefore, the slow charge rate would be four amperes. Charging periods as long as twenty-four hours may be needed to bring a battery to full charge. The best method of making certain a battery is fully charged, but not overcharged is to measure the specific gravity of a cell once per hour.  The battery is fully charged when no change in  specific  gravity  occurs  over  a  three  hour  period  or  when charging current stabilizes (constant voltage type charger). If  a  low  maintenance  (conventional)  battery  is  to  be  charged overnight  (10-16  hours)  use  the  specified  Slow  Charge  rate (Table 6). Maintenance   free   batteries  must   not   be   charged   at   rates greater    than    specified    in    the    Maintenance-Free    Battery Charging Guide (Table 7). If a maintenance free battery is to be recharged overnight, (16 hours) a timer or voltage controlled charger is recommended. If  the  charger  does  not  have  such  controls,  a  3  ampere  rate should  be  used  for  batteries  of  80  minutes  or  less  capacity and 5 amperes for above 80 to 125 minutes reserve capacity batteries.    Batteries  over  125  minutes  should  be  charged  at the specified Slow Charge rate (Table 7). Batteries  that  have  stood  in  a  discharged  condition  for  long periods of time without a recharge, have become sulfated and must  be  recharged  at  a  low  rate  to  avoid  overheating  and excessive  gassing.    It  may  require  two  or  three  days  of  slow charging    to    bring    a    sulfated    battery    to    a    fully    charged condition.         Care     should     be     taken     not     to     overcharge maintenance free type batteries. Some batteries are so badly sulfated they can not be restored to   a   normal   operating   condition,   regardless   of   the   rate   of charge or the length of time the charge is applied.  Therefore, if a battery cannot be restored to a fully charged condition by slow charging, it should be rejected. FAST CHARGING The Fast Charge method provides a high charging rate for a short  period  of  time.    The  charging  rate  should  be  limited  to 60 amperes for 12-volt batteries.  Maximum charging rate for 6-volt batteries (above 180 reserve capacity minutes) can be approximately double this value. Ideally,  fast  charges  should  be  limited  to  the  charging  times shown  under  Fast  Charge  in  the  Battery  Charging  Guides, Tables 6 and 7.  The battery generally cannot be fully charged within  these  time  periods;  but  it  will  receive  sufficient  charge (70  to  90%)  for  practical  service.    To  completely  recharge  a battery,  follow  the  fast  charge  with  a  slow  charge  until  no change in specific gravity occurs over a three hour period. A  battery  with  electrolyte  specific  gravity  of  1.225  or  above, should never be charged at a high rate.  If the charger has not tapered to a low rate, adjust to a slow charge, preferably at a rate of one ampere per positive plate per cell. CHARGING INSTRUCTIONS Before placing a battery on charge, clean the battery terminals if necessary.  Add water sufficient to cover the plates.  Fill to the  proper  level  near  the  end  of  charge.    If  the  battery  is extremely cold, allow it to warm before adding water because the  level  will  rise  as  it  warms.    In  fact,  an  extremely  cold battery will not accept a normal charge until it becomes warm. Following    instructions    of    charger    manufacturer,    connect charger to battery. Connect   the   positive   (+)   charger   lead   to   positive   battery terminal  and  negative  (-)  lead  to  negative  terminal.    If  the battery   is   in   the   vehicle,   connect   the   negative   lead   to   the engine  block  if  the  vehicle  has  a  "negative  ground"  (negative battery   terminals   is   connected   to   ground).      Connect   the positive   lead   to   ground   if   vehicle   has   a   "positive   ground". "Rock"   the   charger   lead   clamps   to   make   certain   a   good connection has been made. Turn the charger "ON" and slowly  increase  the  charging  rate until recommended ampere value is reached. CTS-2771  Page 15 PRINTED IN UNITED STATES OF AMERICA

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