Charging, checking the state and capacity of the battery - ra54001401130x(1130)

Checking state of charge, B. Charging, C. Load test Model 140 

Operation no. of operation texts and work units or standard texts and flat rates:

1. Checking state of charge 

   Pay attention to warning notes and safety precautions (Initial filling of the battery  , A.).

   Fig 1: Checking Electrolyte Level

   Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
   TEST DATA
   
   

   Electrolyte density in kg/dm3 at 20 °C	charged	1.28
   	semi-charged	1.20
   	discharged	1.12

   Visual inspection	for external leaks.
   Cell covers	unscrew, screw in.
   Electrolyte density	measure, min. 1.24 kg/dm3 .
   	If the electrolyte density in one or several cells differs from the others by >0.04 kg/dm3 , renew battery.
   	Electrolyte density <1.24 kg/dm3 , perform charging battery, perform B.
   Electrolyte level	check, top up distilled water if necessary.
   	If no fault found, perform load test C.

   COMMERCIALLY AVAILABLE TESTER
   
   

   Acidimeter

   e.g. Hazet

2. Charging 

   Preliminary work:

   A. Checking state of charge

   Quiescent current retention unit	disconnect, connect.
   Battery	disconnect, reconnect (Disconnection and connection of the battery  ).
   Battery	remove, install.
   	NOTE: On vehicles with two batteries both batteries must be removed.
   Cell covers	unscrew.
   Electrolyte level	check, top up distilled water if necessary.
   Cell covers	screw in.
   	Use battery charging room due to generation of explosive gas.
   Positive terminal (+) of charger	connect to positive pole (+) on battery, disconnect.
   Negative terminal ( - ) of charger	connect to negative pole ( - ) of battery, disconnect.
   	On vehicles with two batteries the batteries must be charged separately.
   Charger	switch on, switch off. The charging current should be max. 10 % of battery capacity, e.g. max. 10 A charging current for a 100 Ah battery.
   	Note for quick-charging  Unscrew cell caps.
   	Maximum charging current for 30 minutes 50 amperes then switch over to normal charging (see above).
   Electrolyte density	measure, specification 1.28 kg/dm3 .

   ELECTROLYTE DENSITY
   
   

   Electrolyte density in kg/dm3 at 20 °C charged		1.28
   	semi-charged	1.20
   	discharged	1.12

   NOTE: The electrolyte density is dependent on temperature and varies by 0.01 kg/dm³ for each 15 °C.

   Examples:

   Electrolyte density at 20 °C 1.28 kg/dm³

   Electrolyte density at 35 °C 1.29 kg/dm³

   Electrolyte density at 5 °C 1.27 kg/dm³

   COMMERCIALLY AVAILABLE TESTERS
   
   

   Acidimeter	e.g. Hazet
   Quiescent current retention unit	e.g. Hans Zeheter CMP 12.2

3. Load test 

   Preliminary work:

   A. Checking state of charge

   Fig 2: Checking State Of Battery Charge

   Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

   Quiescent current retention unit	disconnect, connect.
   Battery	disconnect, reconnect (Disconnection and connection of the battery  ).
   Battery	remove, install.
   Electrolyte density	measure, min. 1.24 kg/dm3 ; if electrolyte density <1.24 kg/dm3 , charge battery
   	On vehicles with two batteries both batteries must be removed and tested separately.
   Load test at 20 °C	perform.
   	Capacity/Ah	Load current/A
   	74	230
   	100	300
   Battery minimum voltage	check, specification after 10 seconds approx. 10 V or >10 V.
   	If specified value is not reached, renew battery.
   	If specified value is reached, charge battery.
   Electrolyte density	measure, specification 1.28 kg/dm3 .

   COMMERCIALLY AVAILABLE TESTERS
   
   

   Acidimeter	e.g. Hazet
   Volt/ampere tester with load resistor	e. g. Hermann, Electronic
   Quiescent current retention unit	e. g. Hans Zeheter CMP 12.2