![]() ![]() Hmm, most likely you won`t be able to do this. So that means that my Eneloop batteries can`t be charged 2100 times? It really depends on how you charge them, and how much you discharge them and at what current. I also believe that they can be charged more than 2100 times. This includes a predefined amount of current for charging and discharging, an ambient temperature of X degrees, and a certain amount of rest within their amount of charge and discharge cycles. I believe they can be charged for hundreds of times, but under certain conditions. How many times can Eneloop rechargeable batteries be recharged? In real life, the mAh depends on a few more factors, like the discharge current that is being used, the age of the battery (how much it is used), and the (ambient) temperature. This is a very basic way of looking at it. When you continue throwing water into it, it will still only be 1 gallon of water inside the jug. When you empty the jug, only 1 gallon of water would come out. Fill the jug with 1 gallon of water and it`s full. This is the problem! A 1900mAh battery can only hold 1900 mAh even if you put 2500mA into it. This would imply that you do 25*100mA which would result in 2500mAh. Now you extend the charge time to a total of 25 hours. This is also written on a standard Eneloop, so the 1900mAh of capacity is now inside the battery. When you charge the battery for 19 hours you will have 1900mAh charged. A battery charger uses a charge current of 100mA. Isn`t that the same? Why can`t you use that with charging instead of discharging? So 19 hours of discharge at 100 mA equals 1900 mAh. ![]() The battery will take 19 hours to discharge the battery from 1900 till empty. To simplify it, you take a battery with 1900mAh and a device (let`s take a flashlight for example) that uses a low current of 100mA. This is a simplified way of looking at it, but not really the way mAh actually works. Let`s take a standard Eneloop with a capacity of 1900mAh. When you have a charger that uses a charge current of 100mA, the battery will be fully charged in 19 hours. What is the difference between mA and mAh? And how do they work? A regular white Eneloop AA has a capacity of 1900mAh. This is the total capacity the battery can contain. ![]() On every Eneloop there is a mAh number written. This refers to the amount of energy (capacity/charge) that a battery contains. Eneloop chargers generally charge between 1mA depending on the charger. mA is also used for the discharge current. The higher the mA the faster Eneloop batteries will charge. MA is the unit (mili Ampere) used for the charging current, which you can compare to “the speed of charging”. My quote for max cycle life: “ It`s better to stop the charge prematurely using a high charge current than to overcharge with a low charge current.” These 2 checks can be missed when the batteries are charged at a low current! Not every charger terminates at a certain Voltage like the Powerex MH-C9000. At a higher charge rate, it is easier for the charger to detect a Voltage drop and Temperature increase and therefore know when to stop charging. Charging at a slow current can actually be more problematic when the charger can not detect whether a battery is full. It is not mainly about the charge current but when the charge stops. Please look at the Tests Page for the 5000 cycles test. This is not true just by itself! They put their Eneloop Pros in a time-based charger and think they are treating their batteries nicely. They think that slow charging will result in longer cycle life. I think this is a very common mistake people make. Is slow charging better than fast charging for Eneloops? ![]()
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