Besides being light, it does not suffer from any memory effect, which is the loss in capacity when a battery is recharged without being fully depleted.

For instance, storing user data in flash is an excellent solution to the entirely too-familiar data loss that PDA users face if a battery runs low.

Heating and burning will melt the battery separator, causing loss of protection function or burning of electrolyte and overheat will cause heating, smoking, deformation or burning of batteries.