5 ms·

A fuse won't protect against over-charging or over-discharging. (PTC resettable fuses are great to break continuous overcurren, though!)

• leereeves 10y ago
  Over-discharging?
  • robhu 10y ago
    Drawing too much in a period from the cell.
  • scq 10y ago
    Lithium-ion batteries can be damaged if discharged below around 3v. The protection circuit on a protected battery will normally disconnect the battery at around 3.3v to prevent damage.