Assessments - 3, GPA: 3.7
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Read these instructions carefully and thoroughly before operating this unit. IMPORTANT SAFETY INSTRUCTIONS. READ AND SAVE THESE INSTRUCTIONS. OPERATING THIS PRODUCT INCORRECTLY CAN CAUSE DAMAGE TO THE BATTERIES. READ MANUAL COMPLETELY BEFORE USE. GENERAL PRECAUTIONS • Do not charge battery cells other than NiMH or NiCD. Please check with the battery manufacturer to ensure it can accept the programmed charging and discharging rates. Do not expose the unit to rain or moisture due to the risk of fire. • Do not operate the charger if it appears damaged in any way. • Always place the battery cells with positive tip facing the top. Incorrect polarity may cause fire or explosion. Observe polarity diagrams located on the charger. • Do not allow the unit to be exposed to direct sunlight. Operate in well-ventilated area. Do not place unit on the carpet. • Do not allow the battery terminals to become shorted. • To reduce the risk of damage to the power cord, always pull by connector rather than the cord. • Use only the supplied adapter or optional regional and car adapter offered by Maha Energy. Using third party accessories voids the product warranty. FEATURES & SPECIFICATIONS • Four independent slots for AA or AAA NiMH batteries. • Backlit LCD display. • Digitally displays capacity, voltage, time and current. • Five modes of operation: Charge, Refresh & Analyze, Break-In, Discharge and Cycle. • 19 selectable charging current from 0.2A to 2.0A. • 10 selectable discharging current from 0.1A to 1.0A. • Worldwide power supply. Charging Current: Programmable from 0.2A to 2.0A in increments of 0.1A Topoff Charging Current: 100mA Maintenance Charging Current: 10mA Discharge Termination: Voltage 1.00V Discharging Current: Programmable from 0.1A to 1.0A in increments of 0.1A Capacity Storage Memory: 12 (Cycle mode only) GENERAL BATTERY EDUCATION What is 0.1C, 0.2C, etc? “C” stands for the battery capacity and the number in front of it is the fraction of the battery capacity. For example, 0.1C means 0.1 times the capacity for the battery. For a 2700mAh battery, 0.1C would be 0.1 times 2700mAh which equals 270mA. Choosing the right charging & discharging rate Charging at a rate below 0.33C and above 1.0C is not recommended. Charging too slow may prevent the charger from terminating correctly. Charging too fast may damage the battery. Typically speaking, slower charging rate will yield better battery performance but requires longer time. Faster charging rate may not charge as fully and battery temperature can be higher. Battery Matching In most devices, usually two or more batteries are used together. When batteries are used in a series, the performance is limited by the worst one. In other words, one poorly performing battery can significantly reduce the device runtime. Battery matching refers to grouping batteries with similar “actual” capacity. To perform this, use the Refresh & Analyze mode to determine the battery capacity. Group batteries with capacity within about +/-5% of the rated capacity. Battery “Forming” New batteries and those stored for extended period become chemically deactivated. Battery forming is a charge-discharge-charge cycle which forces a full charge into the battery at a very slow rate. This process activates the battery. In certain cases, it needs to be repeated two or three times. Battery forming can be performed using the Break-In mode. PRINTED IN TAIWAN A03-3713420-496 MODES OF OPERATION This section explains various modes and when to use them. To enable each mode, refer to the “Operation” section. Charge Mode • Recharges the battery at the selected rate. • Useful when battery needs to be recharged without determining the capacity of the battery. It should be used on batteries known to be in good condition and have been in continuous use. • Requires the least amount of time. Refresh & Analyze Mode • First recharges the battery, rest for one hour, discharge, rest, then recharges again. Charging and discharging rates are programmable. • Reports the discharge capacity at the end of the cycle. • Useful when the battery capacity needs to be determined. Also useful for battery with degraded performance. • Recommended once every ten cycles for NiMH batteries. Break-In Mode (IEC capacity analysis) • Applies a 16-hour 0.1C charge (0.1 times the capacity of the battery), rest of one hour, followed by a 0.2C discharge, rest again, and finally a 16-hour 0.1C recharge again. • Recommended for brand-new batteries. This process is also known as “Forming Charge.” Also recommended with batteries that cannot be rescued by the Refresh & Analyze mode. • Recommended once every 30 cycles for NiMH batteries. • Requires 39 to 45 hours to complete. • The process follows the IEC standard for determining battery capacity. Discharge Mode • Discharges the battery at the selected rate. • Useful for analyzing the amount of charge stored in the battery. Battery not recharged at the end of the cycle. Cycle Mode • Performs a charge-...