Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [over-discharge]

38 questions
15
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5 answers

Is it safe to discharge Li-Ion to 0V?

first of all: I know that a completely discharged battery is damaged permanently. I know it experiences irreversible chemical changes. I know it might blow up if you try to charge it. But that's not at all relevant to my question: Is it safe to…
xsrf
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12
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2 answers

How much current can lead acid batteries safely supply?

I have a motor I wish to drive with an 18V lead acid battery. The motor can draw quite a lot of current when stalling and I am worried of overdischarging the lead acid battery. Unlike LiPo batteries with have a maximum current rating, the lead acid…
Chien Hao Tan
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How to fix oscillation of an 'over-discharge protection' circuit for a lead-acid battery

I've created a circuit to protect my lead-acid battery from over-discharging. I used the following circuit diagram. Over-discharge protection circuit for a lead acid battery: For understandable reasons, the circuit is oscillating if I connect the…
sribasu
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4
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NiMH battery discharged to 0V

I have a 90's handheld CB that I'm powering using 10x1.2V NiMH cells all in series. Because these cells are rather old (at least 8 years), when I got a low voltage warning, I decided to measure all the cells one by one. Originally they were charged…
Mauro F.
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2 answers

AP4306 has paralleled two op amps in it's block diagram, is that possible?

Thank you for taking some time to read this. I've recently come across a nice constant voltage/current source (http://www.mouser.com/ds/2/115/AP4306A_B_C-271586.pdf) called an AP4306. Upon reading its datasheet, I was interested in the fact that…
John Kraige
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1 answer

What happens if you draw too much current from a 12 volt sealed lead acid battery?

We all know the Michael Bay-esque excitement you get if you misuse lithium-based cells, but I've heard lead acid batteries are a lot more durable. The datasheet for my sealed lead acid battery says it can deliver 65 amps safely for 5 seconds. What…
Daffy
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Will it be fine to consume 0.0058 mA from a LiPo cell after its lowest discharge voltage of 3V has been reached?

I intend to connect a 240mAh 1S 3.7v 25C LiPo Battery with a 5V Step-Up Regulator to the Arduino pro mini v5 VCC pin bypassing the linear voltage regulator. But the battery datasheet says "Never discharge Li‐Po battery below the Lowest Discharge…
M.Atwya
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1 answer

Where does the system load go on a bq51051b charge controller?

I'm trying to use an integrated chip for Qi Charging + lipo management + overcharge protection and all the hard stuff basically. The only one that is 'integrated enough' seems to be: http://www.ti.com/lit/ds/symlink/bq51051b.pdf In the 'Typical…
user65665
2
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0 answers

Not satisfied with 2.5 V battery protection shutoff. How to stop discharge at a safer voltage?

I have some of these lithium ion battery charging modules which are very commonly available online. They use a TP4056 charger and a DW01 protection IC. The DW01 datasheet says that it should cut off discharge at 2.40 ± 0.1 V, which is already too…
voussoir
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1 answer

What's the minimum discharge voltage for a 12 V LiFePO₄ battery?

I just purchased two "SOK LiFePO4 12 V batteries". One of them, after opening the box, had a voltage of 7.9 V, the other was at 12.9 V. They haven't been used at all. What's the minimum safe discharge voltage for this kind of battery? Should I be…
Rolando Retana
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1 answer

Using a voltage supervisor IC to protect a Li-Ion battery from undervoltage >2.8V?

Sorry if this has already been asked, I tried searching but might not have the right vocabulary. I'm starting to use lithium-ion batteries to power projects, and I've wound up with some 18650 cells. Not wanting to use unprotected cells, I hooked…
Will
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1 answer

Compare over discharge protection disconnect circuits

I am trying to implement a "discharge protection" circuit for an uC (Arduino) powered by a battery. The uC monitors battery voltage and needs to be able to signal the circuit to turn off. Turning on is accomplished by pressing a momentary…
Arik Yavilevich
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Lead-acid batteries discharged too far

I have been working with two 12 V lead-acid batteries in series. Accidently, we kept them turned on for a day or two and one of them drained to ~3 V and the other to ~8 V. I immediately charged them, but they get charged and drained super quickly. I…
mrbeast
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Battery over-discharge protection

I am studying NiMH battery charging and using such a battery on a board to feed other circuits. I would like to add a protection circuit that provides protection for over-discharging the battery at low voltage. Could you give me an idea how can I…
Multicharger
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Why do I hear hissing sounds when I discharge my sealed lead acid batteries at high currents?

I've been doing some discharge tests in order to figure out the Peukert exponents of two sealed lead acid batteries with capacities 7 and 9 Ah, in addition to an initial current of 2.1 and 2.7 A, respectively. I've started noticing a strange hissing…
A.H.Z
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