Normally, it is 0.5C, which is 1A. For 1200-1500 rate type, the charging current is also 0.5C, but only batteries 0.7A lithium batteries generally use a low charge and discharge current. .
If the current increases, the lithium insertion speed will be too fast and the impact on the material structure of the positive and negative electrodes will be indelible. The lifespan of the 18650 battery will end quickly within a dozen weeks and may also cause safety issues. The above refers to bare cells, and usually the finished battery is added with a lithium battery protection board during use, so everyone cares about charging the battery. 18650 Don't worry too much about the current level.
Lithium batteries are labeled 3.7V or 4.2V. It's just that the manufacturer's labeling is different. 3.7V refers to theThe platform voltage (i.e. typical voltage) discharges the battery during use, while 4.2V refers to the voltage when fully charged.
Common rechargeable 18650 lithium batteries have a standard voltage of 3.6 or 3.7 V. When fully charged, it is 4.2 V. This does not matter much. something to do with the power (capacity) of 18650 batteries. from 1800 mAh to 2600 mAh, the main capacity is even marked 3500 or 4000 mAh or more.
It is generally believed that when the no-load voltage of a lithium battery is lower than 3.0V, it is considered exhausted (the specific value depends on the threshold value of the battery protection board). battery, such as as low as 2.8 V and 3.2 V). Most lithium batteries cannot discharge their no-load voltage below 3.2V.
Otherwise, over-discharging will damage the battery (usually beat themLithium batteries on the market are basically used with a protective plate, so over-discharging will also prevent the protective plate from detecting the battery, making it impossible to charge the battery).
4.2 V is the maximum limit voltage for battery charging. It is generally believed that the lithium battery is fully charged when its no-load voltage reaches 4.2V. During the battery charging process, the battery voltage gradually increases. from 3.7V to 4.2V. When charging lithium batteries, the no-load voltage cannot be charged above 4.2V, otherwise the battery will be damaged. This is the particularity of lithium batteries.
Can this be charged?
The discharge rate refers to the number of times the rated current is discharged. It's capacity. For example, a 2000 mAh. the battery has a current rating of 2000mA, then 0.5C is1000 mA and 2 C corresponds to 4000 mA.
Generally, the charging current of lithium batteries is set between 0.2 C and 1 C. The higher the current, the faster the charging and the hotter the battery. Additionally, charging with too much current will not fully fill the capacity because the electrochemical reaction inside the battery takes time. Just like pouring beer, if you pour it too quickly it will produce foam and make it unsatisfactory.
There are several points to note when discharging lithium batteries:
First, the discharge current should not be too large. Excessive current will cause internal heating of the battery and may cause permanent damage. . On mobile, this is no problem, you don't have to think about it. The higher the battery discharge current, the lower the discharge capacity and the faster the voltage drops.
TwoSecondly, you should not overload! The internal storage of electrical energy in lithium batteries is achieved by a reversible chemical change in electrochemistry. Excessive discharge will cause an irreversible reaction of this chemical change. Therefore, lithium batteries are more afraid of over-discharge once the discharge voltage is lower. exceeds 2.7V, it may cause the battery to be discarded.
Detailed information
Precautions for using lithium batteries:
1. Avoid use in harsh conditions, such as: high temperature, high humidity, prolonged exposure to summer sun, etc. Avoid throwing batteries into fire.
2. When removing the battery, make sure the electrical appliance is turned off and the operating temperature should be kept between -20 and 50℃.
3. Avoid “storing” batteries ins electrical appliances out of use for long periods.
Baidu Encyclopedia - Lithium Ion Battery
Actually, you can use this charger to charge, 0.5c charge, which means 0, 5 times the battery capacity (C is the battery capacity), that is, 4000 mAh capacity, 0.5 C is 2000 mA = 2 A current load. /p>
12.6 V is also significant. It represents three ternary lithium batteries connected in series. A single battery is nominally 3.6V and the fully charged voltage is 4.2V. Three fully charged lithium batteries are 12.6V.
I charge the drone battery with a high current of 1c (one current).