All Questions
Tagged with low-battery batteries
38
questions
0
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0
answers
31
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Why would a battery pack read as a lower voltage before being disconnected from device, then read as a higher voltage after [duplicate]
I'm working on a device that uses a proximity sensor to count the number of times something passes through its field of view at a certain distance. It is connected to an Arduino Nano and a battery ...
- 349
3
votes
1
answer
200
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Single-cell lithium battery powered comparator circuit with hysteresis
I recently was reviewing a circuit I made and began to question its feasibility. The circuit cuts off a battery's connection to a load after the voltage has fallen below a certain threshold.
To ...
- 1,263
2
votes
2
answers
4k
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Voltage of 3 V batteries [closed]
I ordered 3 V CR2 batteries. Actually they are 2.92 V and 2.93 V.
Should I consider them faulty, or is this difference from the nominal voltage acceptable?
- 219
0
votes
1
answer
1k
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12 V, 7 Ah SLA battery reads 0 (zero) volts
I have a new 12 V, 7 Ah battery which reads 0 (zero) vokts. Let me explain the situation. I have a 800W UPS (for pc) whose battery wasn't giving enough backup. So I decided to replace the battery. I ...
- 1
1
vote
1
answer
81
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How to estimate Li-ion battery health for an unused smartphone? [closed]
I am considering purchasing a new smartphone that is several years old and could use a little electrical engineering help from the EE geniuses here.
I've performed quite a bit of research, and found ...
1
vote
1
answer
1k
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Li-ion vs Li-Po batteries cut-off protection
I am confused with the differences between Li-ion batteries (like 18650) and Li-Po (the flat ones).
I know that basically they are both lithium ion, but when I want to buy I see that LiPos have always ...
- 11
1
vote
5
answers
477
views
One battery slot kills its sitting battery
My kid has a battery-operated toy, it runs on three AAA batteries, connected in serial. Once, the toy suddenly stopped working, but all batteries were good. I decided to disassemble the toy and look ...
- 29
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39
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Charger says 5-cell li-ion battery at 17.7 volt OCV dead or deeply discharged, what could the cause be?
I have a lawnmower with two lithium-ion batteries. I charged them after sitting during the winter period. One battery charged happily to 19.15 volt open circuit voltage (OCV), whereas the other had ...
- 1,792
0
votes
1
answer
76
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How to prevent circuit from shutting down when motor drain too much power
I have a device which has motor and circuits with PLC. This device is connected to a 12v battery which is powering the PLC and motor. Everything is working fine but when the motor's load is heavy, it ...
- 11
1
vote
1
answer
1k
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6v battery low voltage cut-off circuit
I have a circuit that draw 150 ma and i use 6V/4Ah dry cell to supply. Voltage regulator of this circuit needs minimum 8V so I use boost converter to draw the battery voltage to 8 volts.This converter ...
- 109
3
votes
0
answers
106
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Ultra low power battery
I am currently in the middle of a project and I am quite unsure of what type of battery and battery charger I should be using. To be honest I have never worked with battery or battery charger yet.
In ...
8
votes
1
answer
6k
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Is it normal for a lithium ion battery to read with a very low voltage on a multimeter?
I have a PS Vita and I suspect the battery is dead and needs replacing, as the Vita won't charge at all. But the issue could also be the charge circuit, as when plugging it in to charge the charging ...
- 183
1
vote
1
answer
86
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Calculate battery duration [duplicate]
Maybe this is a trivial question, but I am struggling with it for a while.
I have an alkaline AA battery which is consuming 80mA for 8 seconds each 30 minutes. I need to calculate how many days it ...
- 173
-1
votes
1
answer
485
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9v battery voltage goes down very low when connected, but shoots back up when it is disconnected?
Whenever I leave a 9v battery connected to my circuit (simple circuit connected to a motion sensor) It goes down to about 3.3v, but when I disconnect it again, it will slowly go back up to about 8v. ...
1
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3
answers
3k
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Battery Life Calculation, Sleeping and Wake modes
I have a circuit that consumes 1.6μΑ during sleep mode and 40mA during awake mode. The awake period lasts for 3 seconds and the circuit is on awake mode every 30 minutes. The circuit is powered by ...
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