Battery of LED flashlight

There are commonly use flashlight batteries, 1AA (a 5 batteries), 2AA (2 AA batteries), 3AA (3 AA batteries), NO.5 batteries are also divided into alkaline batteries which is often said that the battery cannot be charged (4.5V) and rechargeable NiMH batteries (1.2V).

There is the lithium battery; the voltage is 2.45-4.20V. There are various models, 14500, 16340, 18650 and so on. Many friends feel somewhat dizzy when look at these figures, say how to distinguish? In fact, it is very simple. The model numbers are given for a reason, such as 14500 battery is 14 mm diameter and length 50 mm; 16340 cell diameter is 16 mm, length 34 mm, and so that a 18650 diameter is 18 mm, length 65 mm.

Lithium battery also divided into protection circuit (to prevent overcharge and over discharge circuit) and without, we should all know lithium should not overcharge and over discharge, if the battery is fully charged and still do not get the charger for a long time continue, charge leakage or explosion would occur;

Over discharge is the battery power is totally gone before going to charge, which will cause the battery scrap. that installed a protection circuit will not have this problem, but the drawback is that the volume gets bigger which is bigger than that without protection, increasing about one millimeter circuit (that is to say the upper battery size) in diameter length about 2 mm. Some flashlight makes it somewhat difficult to put the battery which needs to go into slowly groping, but most are easy to put a flashlight to go.

There is the problem of series and parallel, here to talk about the fact we had junior high school physics: the series current is constant while the voltage is 2 times than before; parallel voltage is constant while current is 2 times than before. If your battery is with protection circuit (with anti-overcharge and over discharge function), do not look at the following introduction, the following is mainly for lithium battery protection circuit does not explain: the new battery is not too much;  anty881209wong 140418

When use the battery for the first time, do not charge for too long time, take action according to the charger's instructions. During charging, according to the charge speed, when the color change indicator immediately remove the battery, Do not overcharge, recommended charging time should not exceed 3-5 hours; fully charged, the battery should be removed from the charger;