IMPRES EOL Alert Trigger

[speedbird727]

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!

[MotFAN]

You can try to find out by inserting battery in IPMRES Data Reader:

https://www.motorolasolutions.com/en...ml#tabresource

[moetorola]

We have had the same issue, we just ignore it for the most part.

[Alpha]

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.