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Was wondering what these random numbers were, I expected a product number from a manufacturer. Instead: > An 18650 Battery is a lithium-ion rechargeable batter
by lucb1e 4y ago
Was wondering what these random numbers were, I expected a product number from a manufacturer. Instead:
> An 18650 Battery is a lithium-ion rechargeable battery. The first 4 digits of the designation “18650” indicate the physical dimensions while the 5 <sup>th</sup> digit indicates it is a cylinder cell. The standard 18650 battery is 18mm around by 65mm long.
(copied from curl because that page crashed the firefox tab, though I guess the superscript wouldn't have been preserved otherwise anyhow so might as well leave that bit of HTML in)
- killingtime74 4y agoIt’s great, it’s almost a standard. Many different manufactures and the only commonality is usually the voltage. 18650 is so popular it’s used in some teslas, while newer ones use 21700
- fragmede 4y agoI’ve also heard they’re going to use 4680 cells for their newer batteries.
- picture 4y agoThe voltage is determined by the chemistry, which unless you seriously deviate from the standard lithium stuff, it's going to be able 4.2 V max. Aside: When people try to increase it to like 4.3 V with "strengthened electrode material," the lifetime still seriously suffers. I'm typing this comment on a Razer Blade 15 with a currently swollen battery pack, which has been replaced only 10 months ago due to the same swelling issue
- adrian_b 4y agoA lot of batteries are designated in this way. E.g. a 2032 lithium battery for computer motherboards has a diameter of 20 mm (20-) and a height of 3.2 mm (-32). A thinner 2025 battery, used in various appliances, has a diameter of 20 mm and a height of 2.5 mm. There are many other such standard dimensions encoded in the battery numbers.