Importance

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Abstract

A battery monitoring method and apparatus are used for monitoring the charge level of a rechargeable electric storage battery, for example a lead acid battery. The counter-voltage of the battery is monitored by continuously monitoring the actual terminal voltage of the battery. When the battery is fully charged, the monitor provides a 'DO NOT CHARGE' signal, for example a green light. When the charge level has dropped to a point that there may be some value in recharging the battery, the 'DO NOT CHARGE' signal is replaced with an 'OK TO CHARGE' signal, for example a yellow light. When the battery has discharged to the point where the battery must be recharged in order to avoid damage, the 'OK TO CHARGE' signal is replaced with a 'MUST CHARGE' signal, for example a red light. Audible signals may accompany the 'OK TO CHARGE' and 'MUST CHARGE' signals. The monitor is self-testing when turned on. It automatically recognizes the charge level of a battery to which it is connected. When used in association with, for example, a lift truck , the monitor may include a lift lock-out function that is engaged in response to the battery being discharged to the 'MUST CHARGE' level.

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First Claim