What are the uses of lithium batteries without charging boards?

Simple charging circuit: Many companies now sell lithium batteries without a charging board. Its superior performance and low price can be used for maintenance and replacement of self-made products and lithium batteries, so it is deeply loved by the majority of electronics enthusiasts. Interested readers can refer to Figure 2 to make a charging board. The principle is: use a battery charged with a constant voltage to ensure that it is not overcharged. The input DC voltage is only 3 volts higher than the charged battery voltage. R1, Q1, W1, and TL431 constitute a precision adjustable voltage regulating circuit, Q2, W2, and R2 constitute an adjustable constant current circuit, and Q3, R3, R4, R5, and LED are used as a charging indicator circuit. When the voltage of the rechargeable battery is increased, the charging current will gradually decrease, and the voltage drop R4 will decrease after the battery is fully charged, enabling the third quarter, and the LED. In order to ensure sufficient battery, please continue to charge for 1-2 hours after the indicator light. Please use when installing suitable radiators Q2 and Q3. The advantages of this circuit are: easy to manufacture, easy to purchase components, safe charging, intuitive display, and no damage to the battery. The disadvantage is that there is no over-discharge control circuit. Single lithium battery application examples 1. Use battery maintenance alternatives There are many battery packs: such as battery packs used in laptop computers, they are found to be damaged only by a single battery. A suitable single lithium battery can be selected for replacement. 2. Make a high-brightness mini flashlight. The author uses a 3.6v1.6AH single lithium battery with a white super-bright luminous tube to make a mini flashlight, which is easy to use, compact and beautiful. And because of the large capacity of the battery, it can be used for half an hour at night on average, and it has been used for more than two months and still don’t charge it. 3. Replace the 3V power supply and the voltage of a single 18650 lithium battery is 3.6v. Therefore, one lithium battery can replace two ordinary batteries to power small appliances such as radios, walkmans, cameras, etc., which is not only light in weight, but also long lasting. Lithium battery storage: Lithium batteries should be stored in sufficient power. It can be stored for more than half a year at 20°C, so lithium batteries are suitable for low-temperature storage. It is recommended to store rechargeable batteries in the refrigerator, which is a good idea. Use: Lithium batteries must not be disassembled, drilled, broken down, sawed, pressurized, heated, otherwise it may cause serious consequences. Lithium batteries without a rechargeable protection board must not be short-circuited or used for children's play. Keep away from flammable and chemical substances. Discarded lithium batteries should be disposed of properly. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: How about the safety of mobile power?