Replacement Laptop Battery 02K6620/02K6621 For ThinkPad T20/T21

Black - A colour which does not emit any colour of the spectrum. Black absorbs all frequencies of the spectrum.

Battery - A device used for the storage of electricity

Cm - Centimetres, one centimetre is equal to 10 milimetres

weight - A measure of the force applied on an object by gravity. Measured metric in grams and kilos or imperial in lbs and oz

Voltage - A measurement of volts.

Dimension - The shape or measurements of something.

Li-ion - A rechargable battery. Popular in portable electronics combining one of the best energy densities and not suffering memory effect. Very slow loss of charge when not in use.

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