Commonly used batteries for battery flashlights are 1AA (1 section 5th battery), 2AA (2 section 5th battery), 3AA (3 sections of 5th battery), and 5th battery is divided into alkaline battery, which is usually called dry battery that cannot be charged. (4.5V) and rechargeable Ni-MH battery (1.2V)
There is a lithium battery, the voltage is 2.45-4.20V, the model has 14500, 16340, 18650, etc. Many friends see these numbers are a little dizzy, how to distinguish it, in fact, it is very simple, the number of the model is for a reason, For example, the 14500 battery has a diameter of 14 mm and a length of 50 mm; the 16340 battery has a diameter of 16 mm and a length of 34 mm, and so on. The 18650 battery has a diameter of 18 mm and a length of 65 mm.
Lithium battery is also divided into protection circuit (preventing overcharge and over discharge circuit) and not. Everyone should know that lithium battery can not be overcharged. If the battery is overcharged, it is fully charged. If it comes out for a long time, it will continue to overflow or explode;
If it is over-discharged, it means that the battery is not used until it is charged. This will cause the battery to be scrapped. Now, if there is a protection circuit installed, there will be no such problem, but the disadvantage is that the volume becomes larger, than without The protection circuit (that is, the size of the battery in the previous paragraph) is larger, the diameter is increased by about 1 mm, and the length is increased by about 2 mm. Some of the flashlights are difficult to put on the battery, and they need to be slowly explored to plug in, but most of the flashlights can be easily put in.
There is also the problem of parallel connection of batteries, here to talk about, in fact, we have learned in junior high school physics: the series current is constant, the voltage is 2 times before; the parallel voltage is constant, the current is 2 times before. If your battery is equipped with a protection circuit (with anti-overcharge and over-discharge function), you don't need to look at the following introduction. The following is mainly for the lithium battery without protection circuit: the new battery is not too much.
When the battery is used for the first time, it does not need to be charged for too long. It can only be processed according to the charging indication of the charger. When charging, according to the charging speed of the charger, when the color of the indicator changes, the battery is removed immediately. Do not overcharge, it is recommended not to charge more than 3-5 hours; to charge the battery, remove the battery from the charger.
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