Generally speaking, 1000mA achieves nearly full charge completeness for AA batteries.Even after the charge ends (DONE appears on screen), the charger will apply a topoff charge and continuous maintenance charge. This typically occurs at a rate greater than 1500mA. When charging at higher current, the charge completeness reduces thereby lowering the charging capacity. When using higher charging current, the charging capacity seems to reduce. You should also use a higher charging rate. At the same time, the battery temperature failed to reach the termination limit as the charging rate was probably too low.To address this issue, you should attempt to perform a BREAK-IN mode on the batteries first. For certain older (and low quality) batteries, they do not produce the proper negative delta V signal (a small voltage drop at the conclusion of the charge) needed for the charger to stop. The charger terminates by voltage and by temperature simultaneously. Why doesn’t the charger terminate correctly? I am charging some older batteries and see that the charging capacity is much higher than the capacity I programmed. This is the charging scheme recommended by International Electrotechnical Commission (IEC). The increased total charging capacity compensates for energy lost as heat. This does not cause any harm to the battery as the charging rate is very low (only 10% of the battery capacity). When using the BREAK-IN mode, the charger puts in 1.6 times the capacity of the battery (entered at the start of the charge). Using the BREAK-IN mode, I am seeing a charging capacity much higher than the capacity I programmed. However, exercise common sense when keeping appliances constantly plugged in the wall. It is okay to keep the batteries in the charger as the batteries will always be ready for use. This "trickle charge" stops only when the batteries are removed. Upon completing the charge, the MH-C9000 goes to a very slow charge current (less than 10 mA) to keep the battery topped off. For 2650 mAh battery, use 2700mAh capacity.Ĭan I leave batteries in the charger? Does the charger keep the batteries topped off? The charger only allows capacity (in the BREAK-IN mode) to be entered in increments of 100 mAh. Therefore, a Powerex 2700mAh that tests to be higher than 2500mAh using the BREAK-IN mode is considered within specification. The Powerex 2700mAh batteries, for instance, has a 2700mAh typical capacity and a 2500mAh minimum capacity. To obtain a capacity that is closest to the rated capacity, use the BREAK-IN mode, which is similar to the process used by manufacturers to test and rate the batteries.įurthermore, most batteries have a typical and minimum capacity. When tested using the REFRESH/ANALYZE mode, the capacity will be lower than the capacity on indicated on the battery. My brand new Powerex batteries are showing a lower capacity than the label in the MH-C9000? Should I return these batteries? This is the default auto charging mode and does not require you to program the charger. Yes! The charger defaults to CHARGING mode at 1A if no button is pressed 10 seconds after inserting the batteries. Is there a way to charge batteries without pressing buttons? Here are some settings for common batteries: The recommended discharging current is 0.25C, or 0.25C times the battery capacity. The recommended charging current is 0.5C, or 0.5 times the battery capacity. What are the recommended charging and discharging current for my battery?
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