Process
According to professionals, the process of making fake cell phone batteries is very simple. The most important thing is to find a suitable size battery cell, then put the battery cell into the original battery box and connect the wires, then use a soldering iron to connect the wires, and a battery is ready.
4 photos in total
Homemade cell phone battery
Charging
Basic charging of a cell phone battery homemade is quite simple, but the safety of charging is the most important difficulty. The rule of thumb is to charge at a constant current (between 0.2 C and 0.7 C) until the battery reaches 4.2 Vpc (volts per cell), and maintain the voltage of 4.2 V until the charging current drops to 10% of the original charging value. . The maximum charging voltage (maximum charging voltage) and currentt (terminating current) vary slightly depending on the battery manufacturer.
Protection
Charging temperature: When lower than 0 degree and higher than 45 degree C, charging will not be possible. The charging current should not be too high, generally less than. 0.7C;
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Discharge protection: to avoid danger caused by battery short circuit;?
Charging voltage: built-in permanent fuse to prevent excessive voltage from being applied to the battery;
Overload protection: When the battery voltage exceeds 4.3V, it stops charging;
Overcharge Protection: When the battery voltage is lower than 2.3V, it will stop discharging (voltage value (varies by manufacturer), the fuse will open when the battery has been exposed to higher temperatures at 100 degrees Celsius
Standard specifications
.China's "Current General Specifications for Lithium-Ion Batteries for Mobile Phones" clearly stipulates that mobile phone batteries sold in the domestic market must undergo strict testing and have reached the standard, the surface area of the battery is marked with the product name, capacity, place of origin, model, implementation standards, precautions and plates, etc. The mobile phone batteries manufactured by us that appear on the market obviously do not meet national standards and should be resolutely investigated and sanctioned.
Problem
Cause
According to battery sellers, there was a large market for on-site battery production in 2009, and most products were sold to migrant workers in cities. Manufacturers that supply battery equipment said cell phone upgradesare too fast, resulting in the inability to supply batteries to the subsequent market. As long as you buy a microcomputer spot welding machine and a set of battery cells, you can make different types of batteries. on the site.
The quality is concerning
Batteries produced in this way have not been tested for safety. Not only can the quality not be guaranteed, but they are also unsafe to use. Due to power outages, leaks and heat. In the event of overcharging, overdischarging, etc., the separator of the lower battery cell may be broken, causing a short circuit between the positive and negative electrodes of the cell. the battery could explode.