Different sizes. Although 18650 and 18655 batteries look similar, but the size of the two is actually different, 18650 is much larger than 186855 battery in both length and diameter.
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2. The voltage is different. The voltage of lithium battery is generally about 3.5-4.0V, the most common is 3.7V; The 18655 battery has a voltage of 1.5V (non-rechargeable) or 1.2V (rechargeable).
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3. Its working principle (internal chemical reaction process) is different.
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4.18650 is a rechargeable battery, most of the ordinary 18655 batteries are disposable batteries, rechargeable very little.
There is no difference, the formal name is 18650, and some people only call 1865,18650 lithium battery is 18mm in diameter. Length 650mm.