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Thread: IMPRES EOL Alert Trigger

  1. #1
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    Default IMPRES EOL Alert Trigger

    Hi All,

    Does anyone happen to know which threshold(s) trigger an IMPRES charger to red/green flash the "approaching EOL" alert?

    I have 2 HNN4001A IMPRES NiMH batteries showing 84% Rated Capacity (1517 mAh 8.4 Volts) accompanied by the red/green alternating flash. I have other batteries of the same model with lesser percentages of rated capacity that don't trigger the EOL alert. Therefore, I am led to believe that the threshold is not exclusively percentage of rated capacity remaining.

    Confusingly, the Motorola white paper titled Intelligent Battery Management: The Motorola IMPRES Smart Energy System states that "IMPRES chargers contain an alternating red/green LED indicator warning users that batteries have fallen below a defined capacity threshold, typically 60% of rated capacity."

    My thanks in advance if you can help me better understand the issue!
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  2. #2
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    You can try to find out by inserting battery in IPMRES Data Reader:

    https://www.motorolasolutions.com/en...ml#tabresource
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    speedbird727 (Jan 04, 2019)

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    We have had the same issue, we just ignore it for the most part.
    Radio Referenced...Those who think they know it all are very annoying to those of use who do.

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    I seem to remember reading it was 70% of rated capacity a while back, but maybe they lowered it so people wouldn't be urged to replace marginal batteries quite so soon, perhaps? Your evidence to the contrary is the first I have heard or seen that contradicts that hard percentage figure. Maybe it takes inception date into account as well - as the battery gets older, the percentage drops, maybe? A dump of both batteries first charged dates as well as max capacities would be interesting to see if it correlates.

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    I had a discussion with a district chief about this yesterday. I said 70% and he said he was told 60% by M