TEMPORARY REVISION - MD Helicopters

CSP−H−2MD Helicopters, Inc.500 Series − Basic HMI(6). Remove filler vent caps and checkelectrolyte level. Replenish with puredistilled water (Ref. Table 2−3) ifnecessary, taking care not to over−fill.(7). Replace and tighten filler vent caps.B. Battery Deep CyclingReview the battery handlingWARNING and servicing precautions(Ref. Battery Handling and ServicePrecautions) before preforming the followingcharging operations.(1). Perform normal charging (Ref. NormalBattery Charging).(2). Connect a 9 ohm resistance (9 ohm, 200watt−resistor or three 3 ohm, 75 wattresistors in series) across the batteryterminals and allow the battery todischarge for approximately 12 hours,or until the battery voltage decreasebelow one volt.(3). Remove 9 ohm load resistance frombattery and loosen cell filler vent caps.(4). Charge battery until charging dropsbelow 0.30 ampere.(5). While continuing to charge the batteryat a rate less than 0.30 ampere, use anaccurate voltmeter to measure thevoltage across the terminals of eachindividual battery cell. Each individualcell should be within 0.05 volt of the cellvoltage specified below for applicablecharging voltage.Charging Voltage(volts dc)Cell Voltage(volts dc)28.0 1.4728.1 1.4828.2 1.4828.3 1.4928.4 1.4928.5 1.50NOTE: Nominal individual cell voltage is 1.25volts for a normal, disconnected, fullycharged cell.(6). Switch charger OFF and then disconnectbattery charger.(7). Allow battery to rest for a minimum ofone hour maximum and a maximum of2 hours; adjust electrolyte level.(8). If electrolyte level is adjusted, reconnectbattery to charger and allow thebattery continue charging for thirtyminutes.If battery temperature exceedsCAUTIONroom temperature during initialcharging, battery temperature must be allowto decrease to room temperature beforerecharging the second time.(9). After allowing battery temperature todecrease to room temperature, repeatthe procedures described in steps (2).thru (8). above to cycle the battery asecond time.NOTE: When making the individual cell voltagemeasurement the second time, the voltageof each individual cell must measurewithin the voltage limits specified in step eabove. If the voltage of any individual celldoes not measure within the specified voltagelimits, the cell must be discarded. Replacea defective cell according to instructions.(10). Switch charger off and then disconnectbattery from charger.(11). Tighten cell filler vent caps.Page 2−20TR09−001