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most of these I have seen have the charge protection tabs on the top. are the laptop batteries different? most of my experience is from buying fresh cells to u

• dragontamer 9y ago
  > most of these I have seen have the charge protection tabs on the top. That depends on the cell. Some cells have charge protection. Others don't. The 18650 cell is standardized only in size-and-shape. The actual protection, chemicals, and other specifications are completely different from cell to cell. Heck, some 18650s have 3.2V nominal voltage, while others have 3.7V. IIRC, charge protection causes a voltage drop. So some applications prefer to use unprotected cells (with the overall device implementing charge protection elsewhere). For example, Laptops probably have ONE charge-protection circuit somewhere in their construction, rather than 6-charge protection circuits (each cell). This simple fix will cause 1/6th the voltage drop compared to 6x individual charge protection circuits.
  • wlesieutre 9y ago
    The amount of current a battery can deliver also varies. Flashlight forums where people sometimes want the maximum power output will point you to a couple of specific 18650 parts and a similarly small number of sources where you can be reasonably sure they aren't counterfeits. (Some) manufacturers provide specs for their batteries, but most of them are coming from no-name factories in China with no reputation at stake, so there's either nothing published or it's exaggerated.