Advantages: Very low profile - batteries resembling the profile of a credit card are feasible.

Flexible form factor - manufacturers are not bound by standard cell formats. With high volume, any reasonable size can be produced economically.

Light weight - gelled electrolytes enable simplified packaging by eliminating the metal shell.

Improved safety - more resistant to overcharge; Less chance for electrolyte leakage.

Application: Cell phones, MP3, Bluetooth etc.