Take note of this if you are doing cycle-life tests. Something worth noting if you are using the MJ1 for high-drain and fast charge (which most of you will probably take advantage of) is that LG Chem recommends that cells are to rest 10 minutes after charge and 20 minutes after discharge. Charge at 1,500mA to 4.20V (tapered end current 100mA).However the MJ1 goes a step further and also defines testing conditions for high-drain and fast-charge conditions: You might think this testing condition is low, and you are right it is the minimal viable current draw, which is where capacity ratings come from. For those readers working on electric vehicles, this is the same discharge conditions as the Panasonic 18650B. To find out what this is in amps, take the nominal capacity (3.4Ah) and multiply it by the C (maximum safe discharge capacity, where C stands for capacity) rating.
This leads to a shorter battery life, and less capacity in the long-run. Most 18650 chargers on the market do not have great tapering, and as such charge termination suffers. It gradually reduces the amount of current put in the battery as it reaches the end of a charge cycle. If you are still wondering what is charge tapering or if you want to learn more I recommend this short paper titled Battery Charger Termination Issues. by Texas Instruments. To taper means to "reduce towards the end" which is what a high-quality charger does when reaching a voltage close to 4.2. 18650 batteries should not exceed 60 - 70 ° C, and should not be charged when below freezing.Ĭharge tapering is what lithium-ion batteries do to get as high-voltage as possible, as safely as possible. Your temperature will effect your battery's performance, and the farther you deviate from the optimal temperature the greater the loss of efficiency and overall capacity. Most 18650 batteries are tested at 25 degrees. Many people prefer to keep their lithium ion batteries charged above 3.0V.įor what it's worth, 23 degrees Celsius is a slightly lower than most optimal temperatures. However, for many purposes it is best to recharge the battery before it discharges to 2.50V. The total safe voltage range for the LG MJ1 is between 2.50V and 4.20V.
Let's take a look at its official specifications:Īs you can see, the MJ1 really boasts a high capacity - 3500 mAh. The MJ1 is certainly no exception, as it's nominal capacity is of the highest of all 18650 batteries on the market, and it achieves this without sacrificing much of its maximum discharge rating. Every new generation of batteries provide just about an 8% increase in capacity (generalized) over those of the previous year. The MJ1 is new, that is why it is exciting. It is a rechargeable lithium ion battery, just like all other 18650 batteries we review on Battery Bro.
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