1, look at the battery
The batteries used in lithium batteries are mostly soft-pack batteries and 18650 batteries. First, check whether the battery is brand new, because there are cases where bad small workshops use second-hand batteries to make lithium batteries.
Soft-pack lithium battery, also known as polymer battery, is a kind of soft-pack battery with colloidal electrolyte, which can be made into various shapes. The battery is safe and will not explode. 18650, electrolyte is liquid, with large capacity * up to 3000mAh, but it may explode, with low safety factor.
Step 2 look at the weight
The weight of a lithium battery is directly proportional to its capacity. If the weight difference of lithium polymer is too large, the capacity will definitely be insufficient. However, it's hard to say that some batteries have different capacities, so it's good for the battery industry to find some lithium battery manufacturers with high reputation. In order to reduce the cost, many people falsely mark the capacity with inferior batteries and protective plates, so be careful when buying, so as not to be deceived.
Advantages of lithium battery:
1, the energy is relatively high. It has a high energy storage density, reaching 460-600Wh/kg, which is about 6-7 times that of lead-acid batteries.
2. Long service life, which can reach more than 6 years. The battery with lithium ferrous phosphate as the positive electrode has been charged and discharged at 1C( 100%DOD) and can be used for 10000 times.
3. The rated voltage is high (the single working voltage is 3.7V or 3.2V), which is about equal to the series voltage of three nickel-cadmium or nickel-hydrogen rechargeable batteries, so it is convenient to form a battery power supply group; The voltage of lithium battery can be adjusted to 3.0V through the new technology of lithium battery voltage regulator, which is suitable for small household appliances.
4. It has high power endurance, and the Ferrous lithium phosphate lithium-ion battery for electric vehicles can reach the charge-discharge capacity of 15-30C, which is convenient for high-intensity starting and acceleration.
5. The self-discharge rate is very low, which is one of the most outstanding advantages of this kind of battery, generally lower than 1%/ month and less than 1/20 of nickel-hydrogen battery.
6. Light weight, which is about 1/6- 1/5 of lead-acid products with the same volume.
7, high and low temperature adaptability, can be used in the environment of -20℃-60℃, after processing, can be used in the environment of -45℃.
8. Green and environmental protection. Whether it is produced, used or scrapped, it does not contain or produce any toxic and harmful heavy metal elements and substances such as lead, mercury and cadmium.
Refer to the above content: Baidu Encyclopedia-Lithium Battery