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 Telecommunications Object Thesaurus Term

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secondary battery

secondary batteries

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Electrochemical source of electricity in which the current is produced by a reversible reaction. Comprises two or more secondary cells coupled together. Batteries of this type may be recharged. Typically, but not exclusively, of the lead/acid type.


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fun and games

Can you beat our games? Explode equipment to see what's inside, hear the changing sounds of telecommunications, see how telecommunications designs have changed over time or send an e-postacard.

what's on

The UK's first permanent gallery dedicated to the history of information and communication technologies opens in the new Information Age gallery at London’s Science Museum.

audio history

Take a trip down memory lane with extracts of the interviews which have been recorded as part of the Connected Earth oral history programme.

featured story

100 years of automatic switching!
In 1912 the GPO installed Britain's first automatic telephone exchange in Epsom.

Discover the early days of the telephone...