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Why does my NXT recharable battery only shows about 8.4 and not 9.0 volts with a full charge?

April 26, 2017battery charge nxt shows volts

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Why does my NXT recharable battery only shows about 8.4 and not 9.0 volts with a full charge?

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Recharable batteries do not have the same voltage as alkaline batteries. Alkalines are 1.5 volts a cell for a total of 9.0 volts in an NXT (or RCX). NIMH cells are about 1.2 volts per cell. If the battery had six cells inside you would expect to see about 7.2 volts. But the NXT recharable battery has 7 cells for a total of ABOUT 8.4 volts. As such, 8.4 volts is about what you should expect to see. The fact that you have ‘lost’ 0.7-0.8 volts compared to alkalines should not be a concern. What you are really are looking for is a battery voltage that does not change significantly over time and usage. The rather beefy NXT recharable battery should be just the ticket.