Index Subaru Subaru Impreza 3 / Impreza WRX / Impreza WRX STI - service repair manual 2008-2014 year
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SC(STI)-28 Battery STARTING/CHARGING SYSTEMS 2) Measuring the specific gravity of the electrolyte in the battery will disclose the state of charge of the battery. The relation between specific gravity and state of charge is as shown in the figure. D: MEASUREMENT WARNING: Do not bring an open flame close to the battery when working. • Prior to charging, corroded terminals should be cleaned with a brush and common caustic soda solution. • Be careful since battery electrolyte overflows while charging the battery. • Observe instructions when handling the bat- tery charger. • Before charging the battery on the vehicle, disconnect the battery ground terminal to pre- vent damage of generator diodes or other elec- trical units. 1. JUDGMENT OF BATTERY IN CHARGED CONDITION 1) Specific gravity of electrolyte should be held within the specific range of 1.250 — 1.290 for one hour or more. 2) Voltage per battery cell should be held at a spe- cific value in a range of 2.5 — 2.8 V for one hour or more. 2. CHECK CONDITION OF CHARGE WITH HYDROMETER 3. NORMAL CHARGING Charge the battery at the current value specified by manufacturer or at approximately 1/10 of battery’s ampere-hour rating. 4. QUICK CHARGING CAUTION: • Observe the items in “3. NORMAL CHARG- ING”. • Never use 10 A or more when charging the battery because it will shorten the battery life. Quick charging is a method that the battery is charged in a short period of time with a relatively large current by using a quick charger. Since a large current flow raises electrolyte temper- ature, the battery is subject to damage if the large current is used for prolonged time. For this reason, quick charging must be carried out within a current range that will not raise the electrolyte temperature to 40°C (104°F) or more. Also the quick charging is a temporary mean to bring battery voltage up to some level, and battery should be charged slowly with low current as a rule. Hydrometer indicator State of charge Corrective action Green dot 65% or more Load test Dark dot 65% or less Charge battery Clear dot Low electrolyte Replace the battery.* (If cranking is difficult) * Check electrical system before replacement. 1.28 Specific gravity [20˚C (68˚F)] Specific gravity and state of charge Complete charge Charging condition 1.26 1.24 1.22 1.20 1.16 1.14 1.12 100% 75% 50% 22% 0% (%) SC-00094 |