Questions tagged [lithium-ion]

Questions regarding Li-ion batteries (Lithium-ion), including proper charging and usage.

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13 views

Does the CN3065 lithium charge controller have discharge protection?

I found a vape pen by the road in poor shape but after some careful removal, inspection, and a charge cycle outdoors, the lithium battery pack seems okay. Rather than try figure out how to properly ...
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32 views

how to determine the Remaining useful life of lithium battery given charging discharging voltage, load, temperature of different cycles?

given 3 datas 1st-dataset contains charging details with fields:Voltage_measured,Current_measured,Temperature_measured,Current_charge,Voltage_charge,Time. 2nd-dataset contains discharging details with ...
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22 views

Experiences with18650 li-ion batteries from chinese brands (BAK, EVE, DLG)?

I know certain chinese brands such as ultrafire have a very bad reputation but i was wondering if better known chinese cell brands (of which products are sold by reputable sellers such as batterybro....
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43 views

Li-Po battery standards for EU & US

I am selecting a Lithium Polymer battery for a general low power electronic device with wireless communication which we plan to sell in EU and US. My reference is following documents: IEC-62368: &...
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40 views

LiFePo4 BMS recommendation

I am trying to design a backup power system around the LTC4015 battery charger. I am looking for a battery balancing circuit to balance the charges in the batteries. 4 Batteries used are with 3.2v ...
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50 views

How to charge 18650 at higher current, while discharging? [closed]

I have a battery pack of 4000mAh made out of 18650 cells, similar to this. It charges fine using a 12V 2A adapter. But since I'd be using this in a robot, I'll have to charge it while it stays on and ...
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1answer
560 views

Under-voltage disconnect on MCP73871

I've designed a circuit using an MCP73871 (link below) and some lithium ion 18650 cells. I'm confused by the under-voltage lock-out (UVLO) on that chip as it's not clear (to me at least!) whether it ...
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40 views

I'm going to wire 2 batteries together into a circuit but one has 3 wires and the other has 2 wires how can I make this work?

I have a battery in a circuit I want to add another battery which is the same voltage and amps but 2 wires can I just connect the positives and negatives and leave the white in the circuit?
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228 views

Li-Ion Battery Solar powered circuit

I am currently working on a Solar powered project but I am having a hard time making it work: I have a PCB with an Arduino and a sensor, this circuit consumes 250mA for around 2 seconds every 10 ...
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1answer
139 views

Reducing the start-up voltage of a low voltage cut-off circuit

I just built this circuit, with the intent to use it as a low-voltage cut-off switch for a single li-ion cell. It works great, but once it's triggered it needs about 7 volts to turn back on, so I ...
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45 views

How do we revive an unprotected li ion 18650 battery

How can we confidently revive and recondition an unprotected li ion 18650 battery by aid of common electronic tools and kits
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19 views

How to Design BMS in simulink?

I have designed a battery pack of li-ion batteries. At the initial stage I have given 0 at both constant blocks. This indicates there is no charging or discharging In the second fig I have applied ...
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1answer
17 views

18650 12P2S Charging with BMS and Charge Control Module

I have a quick question on charging options for a 12S2P 18650 Li-Ion pack made of Samsung INR18650-35E cells. I have a pack built using a 12S balancing charging BMS (https://www.ebay.com/itm/...
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51 views

Multiple CC/CV charge controllers in parallel?

Can multiple cc/cv charge controllers (TS1052 for example, which is rated for 100mA drain current) in parallel configuration to achieve a higher drain current? (input signals also connected in ...
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3answers
95 views

Disadvantages of charging Li-Ion battery indefinitely?

I will be using a TI BQ24074 to charge a battery and power a load via a solar panel. Because of the way the BQ24074 works with a ...
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1answer
37 views

AP9211 battery protection

I am planning on using a Diodes Inc. AP9211 battery protection circuit for an IoT project, and I have a question regarding usage. The AP9211 will be embedded in the PCB, while the battery will be ...
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1answer
144 views

Constant voltage charging phase of Li-ion batteries

I've read on batteryuniversity.com that the constant voltage (saturation) stage of Li-ion charging adds approximately 10% of SOC compared to charging with only the constant current (CC) charging phase....
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3k views

NodeMCU power via battery + battery charger + booster

I need to power a NodeMCU (as far as I know it can work with 3v3 but I use some I2C modules that need 5V so let's power everything with 5V.) I have a Li-ion battery (3.7V.) I have a TP5046 based ...
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1answer
41 views

Why does a charging IC keep a low voltage while connected to a used battery?

I have a set of devices using Li-Ion batteries and featuring a charging IC (LTH7). Charging works normally on recent batteries, but does not on used ones. Knowing that chargers initially try to ...
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37 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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264 views

What is wrong with one of the cells in my 4-cell laptop battery? How can I make it better?

History My laptop battery has shown less and less capacity. So I got a new battery (LA04) in Jun 2018, with a warranty of 6 months. After about 8 months, the new battery also showed problems. It went ...
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1answer
31 views

Is a buck converter necessary for a 18V drill conversion? (NiCad to Li-Ion)

Im currently planning out my (first) conversion of an old 18V drill with dead NiCad cells to 18650 Li-Ion. I have enough cells that should support the high discharge rates and I'm putting them into a ...
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146 views

4S Lithium Ion Low Votlage Cutoff

Disclaimer: I'm not an electrical engineer, and most of what I've done so far has been from researching similar designs on the interwebs. I'm just a tinkerer with a soldering iron, so please excuse my ...
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30 views

Battery charging / discharging in a very challenging temperature environment

I'm searching for a solution to charge and discharge a battery pack. The current idea is to use 18650 cells, with 4 or 6 cells (~25-60 Wh) in series. The outside environment I'm dealing with can be ...
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1answer
119 views

What does the inside of a large lithium ion battery look like?

I'm a writer and currently working on a young adult Sci-Fi novel so I obviously don't belong on this stack exchange site. If this question isn't allowed here let me know. I know that inside of a Li-...
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1answer
18 views

battery protection circuit - identify discharge current rate that will trigger protection

We are considering to add a battery protection circuit to our system in addition to the protection circuit that already exists on the 4.2V Li battery pack itself. I know that the batteries have ...
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1answer
33 views

Charging the lithium battery with higher rated charger

This question is two fold: What happens if lithium cells are connected to a higher current capacity charger? Say, a 10Ah 1C rated cell is charged with a charger of 20A. Would the battery only take ...
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1answer
41 views

LiFePO4 or 'Standard' lithium (Chinese cell) pack for e-moped build

I am trying to build my own e-moped for university in Hawaii and I am in need of some advise for the right pack. I currently have two orders awaiting payment on alibaba. They are both 48v 50ah and I ...
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177 views

Led indicator for current flow direction

I want to make a lithium ion charge and discharge indicator using red and green led. While battery is charging red led should glow and during discharge via load it should glow green.
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46 views

How to supply limited power to a hungry BMS for li-ion charging

I am building a li-ion battery pack in a 7-series (3.6V) cell configuration. That gives 25.2V nominal voltage and 29.4V charging voltage. I have a BMS with balancing charging capabilities. This BMS ...
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1answer
37 views

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 ...
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1answer
47 views

To determine wheteher the 18650 li ion is protected battery

How to do correct test and determine whether a 18650 li ion is protected or non-protected battery?
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185 views

2S 18650 Li-ion battery pack conundrum

I recently bought a remote control toy for my son which included 2 2S battery packs, with a single SM-3P plug, and a corresponding USB charger as shown here. Initially, the car worked fine, though ...
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2k views

Connecting battery packs in parallel and series, each with their own BMS

Recently I bought cheap a lot of CASIO DT-9723LI battery packs. Every pack consists of 2 Sony 6th-gen Li-ion 18650 cells and its own 2s BMS. Here the question arises: Can I connect this packs ...
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34 views

Is there a way to tell if a Li-ion battery has been discharged to deep even after they have been charged again?

I have a Li-ion battery pack (1s3p) and would like to know if it had been discharged too deep in the past. Is there a way to measure this even though the batteries have been charged again?
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58 views

How do service stores determine capacity in a lithium battery?

I went to a Samsung service store today with my S9 phone to ask about replacing my battery. The people there plugged the phone into a USB port (I don't know where it was connected) and after a minute ...
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721 views

TP4056 and Lipo batteries

I have several 3.7V 1800mah and 700mah Lipo batteries that also have the 8205A MOSFET and DW01a chips mounted to the top. I've seen the two types of TP4056 boards (one with these two chips for lipo ...
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1answer
25 views

can I parallel two TP4056 to charge 1 cell?

I have a 3600mah Li-ion battery and I want charge it at 2 Amps. I want to use TP4056 module but its output current is 1 Amp max. so I decided to use 2 module in parallel like I draw in photo is that ...
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866 views

Lithium Ion prolonged lifespan

According to the Battery University, charging a Li-ion cell to just 3.92 V is the optimal voltage to avoid stress and lithium plating. Problem is, nearly all consumer chargers focus on going to 4.2 V ...
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32 views

Questions about Li-Ion batteries

I am working on integrating single 4.2V Lithium battery(400mAh capacity), charger IC, and battery fuel gauge for an embedded project. I have watched several TI training videos about battery management,...
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40 views

Running 12 V water valve from 18650

I am looking for a suitable solution for my challenge: I want to run a 12 V water valve (0.5 A current) with Li-ion 3.7 V - 4.2 V batteries while being able to charge these from a 5 V solar panel (or ...
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11k 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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28 views

Optimal time needed to balance lithium cells

I want to balance a lithium cells with 65 Ah capacity, the threshold to start balancing is SOC=101%; In order to calculate the balancing current,I need to fix the balancing time, so what's the ...
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74 views

Solar panel output about 22 - 24V not charging batteries connected in series

I have an eco worthy 4 solar panels (2 * 12 connected in series and 2 * 24 connected in parallel). I can confirm that on a good sunny day output voltage from panels (measured on the red and black ...
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2answers
698 views

Using a tp4056 along with a BMS BOARD

Newcomer here and a total noob. Ok so coming to the question i am planning to build a battery bank with 18650 cells. I am opting for a 3s4p configuration as its closer to my operational requirements. ...
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46 views

Why should we choose to go for a smaller motor (4.5 kW vs 6 kW) for go-cart?

We are thinking of using a 4.5 kW motor and not a 6 kW one. Due to some constraints and rules, the maximum power a motor can have is 6 kW. So why is it recommended to use a smaller motor? And does it ...
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1answer
64 views

Charging Lithium Ion batteries 18650

I connected 10x Lithium Ion batteries in series (3.7V, 2100mAh), I looked into the datasheet and the charging voltage is 4.2V with a current of 1A. Can I simply solder this battery management system ...
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34 views

TP4056 overheating when not charging

I am currently working on a project that involves charging 18650 Li-Ion battery through USB-C using TP4056. Nothing really fancy (or at least have I thought!). The circuit is pretty simple - Battery ...
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3answers
73 views

Using Lithium-ion Battery at -40 Celsius?

Is it possible to use a 18650 cell Lithium-ion battery down to -40 Celsius, discharge only? There would be no charging at this temperature (I've read that causes damage to the cell). Curious if ...
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1answer
41 views

Is it safe to charge a LiPo battery with a Li-ion battery charger circuit?

My PCB includes li-on charger(3.7V) circuit with BQ25060. BQ25060 is to charge single lion battery according to datasheet. I bought new liPo battery(1S,3.7V,1550mAh).But, There is not information ...

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