Lithium batteries can be used directly in parallel, but the principle is that parallel batteries must have the same capacity, otherwise reverse charge losses will easily occur.
You have three batteries of different capacities. You can do it. Connect a 0.5 ohm (2 W) resistor to the positive terminal of the battery, then connect them all in parallel (try to make sure the voltage is constant). is consistent before the parallel connection). This allows the Magnum to be reloaded.
After parallel connection, the voltage is still 4.2V. It definitely won't work if you bring a 12V fan. A 12V fan requires at least 6V to spin. Unless your batteries are connected in series but have different capacities, the series connection will be dangerous.
The best solution is to buy a small DC boost to convert 4.2V to 12V
Is the car battery lead acid or lithium
< p>Lithium batteries can be used in parallel or series depending on voltage and power requirements. Each lithium battery is 3.7V. If you want 7.4V, there are exactly two in series, but usually the capacity of a single one is not as large as 20Ah, so. It's good. Several channels are connected in parallel. The specific method is: two batteries are connected in series to form a single battery. Note: Both batteries must be the same specification, i.e. each channel must be identical. can be directly connected in parallel. For example, 20 1000mAH batteries can be divided into 10. If the channels are directly connected in parallel, the capacity can reach 10AH. There are also 10 blocks of 2000 mAH, which can be divided into 5 channels. and the capacity can also reach 10AH. Once the15 channels above are connected in parallel, it can reach 20AH.But in order to ensure that all batteries can be discharged evenly at the same time, this is the case. It is best to use batteries of the same specification from the same manufacturer.
How to use, charge and purchase the 5th and 7th rechargeable lithium batteries?
Cars are equipped with lead acid batteries. Currently, the car batteries on the market are mainly lead-acid batteries, and only a few have tried lithium batteries.
The reason why lithium batteries are not popular in the automotive battery field is due to safety concerns, related to the nature of lithium batteries themselves. It is understood that the discharge temperature of lithium batteries is minus 20 degrees to 60 degrees, and the charging temperature is 0 degrees to 45 degrees. A collision can easilycause fire and explosion. It can be said that lithium batteries are most afraid of high and low temperatures.
The operating temperature of traditional fuel vehicle engines is very high and an optimal operating temperature must be maintained. To maintain this range, the engine block uses various methods to transfer excess internal heat to the engine compartment and then out of the car. At this moment, we can imagine the temperature in the engine compartment.
In addition, many vehicles are now equipped with turbochargers, which are driven by engine exhaust gases, and the temperature is generally 400 to 500 degrees. Such high temperatures are undoubtedly a disaster for ordinary lithium batteries.
In addition to temperature, impact and extrusion are also unbearable for lithium batteries. We know that beats themCar batteries are mainly placed in the engine compartment of the car, and if the lithium battery equipped in the car is crushed in a traffic accident, the result is likely to be a fire or explosion, causing serious damage. secondary injuries, or even become a danger to the members of the car.
Although lead-acid batteries are large in size, their charging and discharging performance is not good, but very safe. You know, the operating temperature of the engine compartment often reaches several hundred degrees, and the battery is in the engine compartment. Once spontaneously ignited, it will immediately ignite the fuel line. Safety is therefore very important. If the car battery is replaced with a lithium battery, the probability of spontaneous combustion of a fuel vehicle will be much higher.
The so-called fake battery (bucket of espace reserved) is actually equivalent to a wire (it can be understood as using a piece of iron, but shaped like a battery Connect the positive and negative ends of the). Battery slot connected, this is because the rated voltage of lithium iron is 3.2V, and the input voltage of common electrical appliances is 1.5V + 1.5V = 3V (two cells), four cells are 6V, and so on, so it must be 1:1. Of course, there are some risks to using them together. If you want to use AA/AA lithium batteries and the price is acceptable, it is recommended to directly purchase 1.5V rechargeable lithium batteries, available on Taobao. I hope my answer will be useful to you, and I hope you will adopt it, thank you