Electronics - Voltage and Current - Discussion

Some type of primary batteries are available.

For e.g. Telegraph.

Writing on compact disk is an example of charge once stored indefinitely primary batteries can't recharge because they have simple structure and small in size hence it cannot do any reversible change. Although a small change can be made in charge of it by placing it in sunlight for some time.

Why primary batteries can't be recharged?

Are there any examples for charged once, stored indefinitely?

A primary battery can discharge once only, while a second battery is rechargeable. When discharge a rechargeable battery, its electrode volume and structure cause a reversible change. Therefore the design of a rechargeable battery must be adequate to adjust these changes. Since a primary battery internal structure is simpler, it does not have to accommodate reversible volume changes. The primary battery has bigger quality ratio and volume ratio than rechargeable battery, however it has a far bigger impedance, consequently the load capability is lower. Furthermore self-discharge of a primary battery is far lower than secondary one.

Primary batteries are used in watches and radio etc. Secondary batteries are used in cell phones.

Primary battery is used once time and secondary battery used again and again.

(disposable) Anything which is used once and destroyed.

What is the meaning of disposable?

The battery used in car is secondary type and it can be recharged, the cell used in torch is primary type and it can't be recharged.