BATTERY 6Y 5 EMERGENCY BOOST CHARGING NOTE New energizers which have become In cases where the Battery is not sufficiently charged ccmplctcly discharged cvcr it I c1atiVc1Y lchg t0 crank the engine an emergency boost charge may be Pcricd of time such as durihg Vchlclc Stcrhgci applied as a temporary expedient in order to crank the Shculd he tested by thc hYdI cmctc1 mcthcd engine The Emergency Boost Charge method consists Ehcrgizcrs discharged to this dcgrcc cchhct he of onarging at a 40 to 50 ampere rate for a period or one ecceretely tested usihe equipment requiring load half hour capability comparison tests It should be particularly noted that the Emergency Boost Charge will not necessarily restore the Battery to 3 FULL CHARGE HYDROMETER TEST a useful state of charge for continued service After an emergency boost charge failure to charge the Battery Thls t St ShOu1d b usgd Only On Batt jr 1 S which further either by a long uninterrupted driving period or test good Wlhh t Stmg Gqmpm nt Or Specmc Gram Cell Com arison Test but which subse uentl fail ln by the Fast Charge or Slow Charge method may result p q y in failure to crank the engine the next time cranking is S r c h B tt t attempted A Battery should never be condemned on the themove t 8 3 ery from the V h1c1G aim adws basis of failure to crank the engine after an emergency G electrolyte levgl 35 n9C SSary by addmg boost charge Although an emergency boost charge may O1OM SS OdOr1 SS drmkmg Water put enough energy into the Battery to crank the engine uuy charge the Battery at the glow Qhargmg rate as covered in the section entitled Battery once further charging usually 1S necessary ln order to Charging preate a sufficient reserve to crank a second and third Measure the Specific gravity Of the electrolyte in lme each cell and interpret as follows Hydrometer Reading Less Than 1 230 Full charge hydrometer readings less than 1 230 corrected BATTERY TESTING PROCEDURES for temperature indicate the Battery is defective and should be replaced Testing procedures are used to determine whether the Hydrometer Readings Above 1 310 Full charge Battery is l good and usable 2 requires recharging or hydrometer readings above 1 310 corrected for 3 should be replaced Analysis oi Battery conditions temperature indicate that the cells have been can be accomplished by performing a visual inspection improperly filled activation or improperly serv Instrument Test and the full charge hydrometer test iced Poor service and short Battery life will result I VISUAL INSPECTION The first step in testing the Battery should be a SPECIFIC GRAVITY READINGS visual inspection which very often will save time and A hydrometer can be used to measure the specific expense in determining Battery condition gravity of the electrolyte in each cell Check the outside of the Battery for abroken or The hydrometer measures the percentage of sulphuric cracked case or a broken or cracked cover If acid in the battery electrolyte in terms of specific grav any damage is evident the Battery should be ity As a battery drops from a charged to a discharged l P1 d condition the acid leaves the solution and enters the Note the electrolyte level Levels that are too plates causing a decrease in specific gravity of electro low or too high may cause poor performance as lyte An indication ofthe concentration of the electrolyte covered in the section entitled Periodic Serv is obtained with a hydrometer icing When using a hydrometer observe the following points Cheek for loose oebie iognngctigns and for evi l Hydrometer must be clean inside and out to insure dence of corrosion as covered in section entitled all 300lll 2t l 2ldlllg Periodio Servioingl Correct as required before 2 Hydrometer readings must never be taken immedi proceeding with tests ately after water has been added The water must be thoroughly mixed with the electrolyte by charging for at least 15 minutes at a rate high enough to cause 2 INSTRUMENT TEST vigorous gassing A number of suppliers have approved testing 3 lfhydrometer has built in thermometer draw liquid equipment available These testers have a pro into it several times to insure correct temperature grammed test procedure consisting of a series of before taking reading timed discharge and charge events requiring ap 4 Hold hydrometer vertically and draw in just enough proximately 2 to 3 minutes that will determine the liquid from battery cell so that float is free floating condition of the Battery with a high degree of accu Hold hydrometer at eye level so that float is vertical racy When using these testers the procedure rec and free of outer tube then take reading at surface ommended by the tester manufacturer should be fol of liquid Disregard the curvature where the liquid lowed Batteries should not be oharged prior to rises against float stem due to surface tension testing or doing so may alter the test results If a 5 Avoid dropping battery fluid on car or clothing es it tester is not available ior testing the uspeolric is extremely corrosive Any iluidthatdrops should Gravity Cell Comparison Test may be used gr an be washed off immediately with baking soda solution alternate method tout with a sacrifice in testing The specific gravity of the electrolyte varies not only accuracy with the percentage of acid in the liquid but also with CORVAIR SHOP MANUAL SUPPLEMENT