Questions tagged [over-discharge]

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Is TP4056 protection absolutely necessary?

My battery has over-charge, over-discharge, and over-current detection properties. Do I need to use the famous protection circuit as an extra? What are the advantages or disadvantages of this ...
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LIthium 18650 discharge voltage

I am capacity testing 18650 batteries from old laptops using constant current, previously I used 2.8V as discharge/cutoff voltage but now raised the value to 3.0V Discharge current is 1Amp. I know ...
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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 ...
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4 votes
2 answers
165 views

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 ...
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Battery pack for very slow charging of USB device

I have a GPS device that has too small of a battery pack (300mAH) and only lasts a month or so - I want something that can last 6 mo to a year. It can recharge from a USB connection, but only draws ...
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2 answers
75 views

Do I need NiMH discharge protection when load is only LEDs

I'm powering a bunch of LEDs using 3 NiMH cells in series. I don't think I need worry about deep discharge protection as the LEDs will switch off when the voltage drops below their forward voltage. ...
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168 views

How can I use 2 TP4056 to safely discharge 2 18650 cells in series

I am new to electronics. I have made a robotic car type thing with arduino and L298N and I want to power it using two 18650 ...
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36 views

SLA Battery over-discharge protection circuit for robot

I've got a robot powered by a 12v SLA battery. I'd like to build a discharge protection circuit to kill things if the battery dips below 11V. In the event of low voltage, the brain of the robot (...
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Overdischarged 18650s and a TP4056 module

I disassembled an old laptop battery and found 6 Sanyo K29B 18650s. All of them have a voltage of <= 2.5V. When I tried to charge them with a TP4056 module, while measuring the current, the module ...
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1 answer
167 views

1200w dc-dc boost converter low voltage protection not working

I've purchased a 1200w dc-dc converter with the model number SZ-BT07CCCV. I'm using it to convert 12v from a big battery to 24V. the converter comes with three potentiometers according to the ...
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723 views

How to force the FS312F (DW01A-G) battery protection IC to automatically enable itself when reaching the overdischarge release voltage or above

The IC successfully cuts off the battery when the voltage goes below 2.9V (2.4V with DW01-G), but it doesn't reactivate itself when it is reaching its overdischarge release voltage. I would like to ...
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Help troubleshooting diy battery charge/protect/step-up circuit

I am following the schematic below trying to put together the circuit for a battery charger with over/under voltage protection and 3.7 to 5v step up. I have populated only the battery charger part of ...
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1 vote
0 answers
367 views

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 ...
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1 answer
63 views

Need proofing on this 12v battery protection circuit

I am making a battery protection board for my 12v battery. The amperage pulled from the battery could go up to as much as 20A. I want the Arduino (connected to the protection board) to activate the ...
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1 answer
57 views

Vehicle battery (NMC) max discharge rate

I wanted to understand a few things related to secondary batteries:- Do the secondary batteries not have any limit on how much current we can draw from them? a. I understand that we have a limit on ...
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2 answers
592 views

How does the TP4056 overdischarge protection work?

I want to buy this integrated circuit (IC) to charge li-po battery. TP4056 Type-C 1S 3.7V It looks nice for charging but I am afraid of the overdischarge protection of this IC because in the ...
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18650 battery pack with "dead" cells, other cells still usable?

I have an 18650 battery pack (12p20s so 240cells) with 2 parallel groups which recently "died" (voltage is 0v or very close to 0v (0.09v for one of the packs 0.0v for other parallel group). ...
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Deep Discharged Primary Battery Pack Voltages

I deep discharged two 4 cell (2S2P) 7.2 V Lithium Thionyl Chloride battery packs each connected to a GPS tracker. I ran the two packs until each GPS tracker stopped communicating. (can't be certain ...
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1k views

How can I use 2 Tp4056 as protection circuit for diy 2s li ion battery?

Hi I want to use 2 Tp4056 modules as over-discharge protection circuit for my DIY 2s li ion battery pack. Those will not be used for charging! hence will not share input! The load is an arduino nano ...
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0 votes
1 answer
158 views

Comparator loses voltage when connected to mosfet

I want to make a discharger for 18650 batteries so I can store them at a specific voltage. I built a comparator (LM393) with a voltage reference to 3.8V at the inverting input and the voltage of the ...
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12 votes
2 answers
6k views

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 ...
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2 votes
1 answer
2k views

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. ...
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1 answer
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what does built-in LiPo discharge protection look like?

I bought a 100 mAh LiPo from the b&H website because it specifically said that it had overdischarge protection. I really need a reasonable lifetime for this battery so I hooked up the battery to a ...
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13 votes
5 answers
15k views

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 ...
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3 answers
2k views

How to build Li-ion over-discharge protection board

I have an Arduino board with a pump attached to it, and for powering both, I'm using a 18650 battery cell with a DC-DC Boost Converter. I plan to leave it working even when I'm not home, and I know ...
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-1 votes
1 answer
358 views

Battery overdischarging never recover

I really need your help!! I used S-8261 series for battery protection the following picture is circuit and spec of the battery protection When the voltage drop down under overdischarging voltage (2....
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4 votes
2 answers
1k views

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 ...
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2 votes
1 answer
1k views

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. ...
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3 votes
1 answer
5k views

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 ...
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0 votes
3 answers
184 views

Charge Rate Myth?

Many websites post that charging your device with a high ampere charger will heat up the device and depreciate battery life. Is this really true. I have a sony nex camera that uses 5v 500ma input. Is ...
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3 votes
2 answers
168 views

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 ...
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3 votes
1 answer
330 views

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....
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1 vote
2 answers
873 views

Detect power supply voltage threshold, while consuming very low current

Lead acid batteries get damaged by over-discharge somewhat like lithium polymer batteries. I need a circuit that will cut off the load from the battery when it drops below about 10v. That is the easy ...
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