Lithium batteries are divided into primary and secondary. Primary lithium batteries are lithium batteries that cannot be recharged, and secondary lithium batteries are lithium batteries that can be recharged.
Primary lithium batteries in the civilian field is mainly used for: public instrumentation RAM and CMOS circuit board memory and backup power: memory backup, clock power, data backup power: such as a variety of smart card meters /; water meters, electricity meters, heat meters, gas meters, cameras; electronic measuring instruments: intelligent terminal equipment, etc.; in the industrial sector is widely used in automation instrumentation and equipment: automotive electronics TPMS, oilfield oil wells, mines, medical equipment, anti-theft alarm, wireless communications, sea rescue, servo, inverter, touch screen, etc.;
The secondary lithium batteries are often used in cell phone batteries, electric car batteries, electric car batteries, digital camera batteries and so on.
Four major differences between primary and secondary batteries
From the structural point of view, secondary batteries in the discharge between the electrode volume and structure of the reversible changes, while the primary battery is much simpler internally, because it does not need to regulate these reversible changes.
Primary Batteries
Primary batteries have a greater mass specific capacity and volume specific capacity than ordinary rechargeable batteries, but have a much greater internal resistance than secondary batteries, and therefore a lower load capacity.
Primary batteries
The self-discharge of primary batteries is much smaller than that of secondary batteries. Primary batteries can only be discharged once, for example, alkaline and carbon batteries belong to this category, while secondary batteries can be recycled repeatedly.
Secondary batteries are more environmentally friendly than primary batteries. Primary batteries must be discarded after use, and rechargeable batteries can be used repeatedly, in line with national standards of the next generation of rechargeable batteries can usually be used more than 1,000 times, that is to say, rechargeable batteries produce less than 1,000 times the waste of the primary battery, regardless of whether from the point of view of reducing waste or from the point of view of the utilization of resources and the economy, the superiority of the secondary battery is very obvious.
The internal resistance of primary batteries is much larger than that of secondary batteries, and their high-current discharge performance is not as good as that of secondary batteries.
Under the condition of small current and intermittent discharge, the mass specific capacity of primary batteries is greater than that of ordinary secondary batteries, but when the discharge current is greater than 800mAh, the capacity advantage of primary batteries will be significantly reduced.
Which is better, 4-cell or 6-cell secondary lithium battery pack
6-cell is the battery pack consisting of 6 cells, and 4-cell is the battery pack consisting of 4 cells.
Generally, the damage of the battery is caused by the damage of a single cell, which leads to the scrapping of the whole battery. A smaller number of cells will result in a lower failure rate. But 6-cell batteries have longer standby time. It's up to you to decide which one is better, if you can disassemble and repair it yourself, go with the 6-cell, otherwise the 4-cell is still recommended.
In the case of the same brand with the same capacity, I think the four-cell is better, because a lot of battery damage is due to the damage of a single cell leading to the whole battery scrap. With fewer cells, there is less chance of failure.
But the quality of a battery can't be measured by the number of cells, it depends on other factors such as the brand and quality of the cells.