Electronics > Beginners
Notify when batteries getting too low
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Zero999:

--- Quote from: fixit7 on June 15, 2019, 02:33:34 am ---No, that was voltage of INDIVIDUAL cells.

You should not make a lot of assumptions.

--- End quote ---
That shouldn't make any difference. If the voltage of one of the individual cells drops that low, it's likely it'll be damaged.

People will make assumptions, in the absence of enough information.
Audioguru:
Since you said 2.5V then I thought it is too low for a white LED so your two cells must be in series and are producing a total of 2.5V.

My radio controlled model airplanes use two Li-PO cells in series and the airplane warns me the voltage is low at 3.15V per cell by pulsing the main motor, then cutting that motor when the cells are 3.05V each.
With the cells at 3.05V then there is enough power to control the servos for me to steer a glided-in landing. The manufacturer says that running the cells down to 3.15V frequently damages them, use a timer instead.
At home I use the two-cells display thing that shows total voltage, then cell 1 voltage then cell 2 voltage. I use it when I discharge the cells down to 3.7V each (half a full charge) for winter storage.
sleemanj:

--- Quote from: fixit7 on June 15, 2019, 03:22:31 pm ---
--- Quote from: sleemanj on June 15, 2019, 01:52:16 pm ---
Most negative, next most negative, third most negative... most positive

--- End quote ---

I do not understand your post.

Andy

--- End quote ---





fixit7:

--- Quote from: Zero999 on June 15, 2019, 03:47:37 pm ---
--- Quote from: fixit7 on June 15, 2019, 02:33:34 am ---No, that was voltage of INDIVIDUAL cells.

You should not make a lot of assumptions.

--- End quote ---
That shouldn't make any difference. If the voltage of one of the individual cells drops that low, it's likely it'll be damaged.

People will make assumptions, in the absence of enough information.

--- End quote ---

Double the voltage makes a lot of difference.

The batteries charged up to full capacity.

Your last statement is very humorous. You made my day. :-)

Andy
fixit7:

--- Quote from: sleemanj on June 15, 2019, 10:30:21 pm ---
--- Quote from: fixit7 on June 15, 2019, 03:22:31 pm ---
--- Quote from: sleemanj on June 15, 2019, 01:52:16 pm ---
Most negative, next most negative, third most negative... most positive

--- End quote ---

I do not understand your post.

Andy

--- End quote ---





--- End quote ---

Thanks.

Your artwork is impressive. :-)
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