Questions tagged [lithium-ion]

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

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19 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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2answers
169 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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40 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
34 views

How to estimate Li-ion battery health for an unused smartphone?

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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43 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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33 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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2answers
57 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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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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31 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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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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45 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
62 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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31 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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1answer
40 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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3answers
69 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

What are the implications of connecting lithium battery packs in series?

I would like to connect 13S (48V nominal/~25Ah) lithium battery pack in series with a pack of 10 lithium cells (3.7V nominal/~30Ah) in order to get a 14S battery without tearing apart the original ...
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1answer
1k views

Is it safe to use a Li-ion battery after being completely discharged?

I've got a Li-ion battery (LGDBHE21865 Q153F022A2) that has no protection circuits (as far as I know). The battery can support a 20 A current. I used it in my vape device some time in the past, but ...
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1answer
23 views

Any li-ion battery metric or test that could correlate with its past usage?

I am trying to find any metric or test method that I could use to get information regarding a battery's past usage. Suppose a battery 'A' has been used in good conditions in the past and battery 'B' ...
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0answers
46 views

lithium ion electron drift

someone okei my dumbass friend sent me this and asked why should its not work he said electron should drift from cathod to anod again. so,What you think about it?
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17 views

VPC0820 Li-Ion Capacitor how to understand the 97% Self Discharge (V) parameter

Does anyone know what does the self-discharge parameter mean? I know what self-discharge is, but what does over 97% mean?
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35 views

Cell matching by capacity and resistance

When matching li-ion cells in a battery pack how do you use both the cell's resistance AND capacity? I've seen sources mentioning that each parallel group should have about the same capacity, and that ...
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1answer
38 views

Powering the load while charging 3s 18650 battery with BMS balance charger PCB

I want to charge use this battery management system (BMS) balance charging board for charging and management of a 3s 18650 battery. The load and charging port is connected in parallel with power port ...
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17 views

Charging 2 x 14S6P battery packs

I built 2 14S6P battery packs which each have a BMS with a separate port for charging. I am wondering if I should wire a separate charger to each battery or can I create a parallel charging cable ...
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1answer
28 views

Is it suitable to wire 'protected' li-ion cells in series and parallel? 2S6P

Here is the circuit designed to give about 7V. Each cell would be a protected cell. Is it safe to connect these cells that way? Thanks
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1answer
44 views

How can I build a power bank which charges to 16.8V and outputs 12V?

I am working on a battery build project to drive a small 12V electric motor (7A max current draw), and so far I have gotten this far: I will use Li-ion 18650 cells in a 4S6P configuration I will wire ...
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1answer
53 views

How much heat is generated by a Li-ion phosphate battery during discharge

I am designing an enclosed container with 10 kWh 50 V battery in it which requires me to actively remove the heat. The battery feeds an 8.8 kVA inverter. Assume I have a load of 8 kW, which would draw ...
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1answer
48 views

On new phones, how are two batteries at half capacity able to charge faster than one at full capacity?

Lately, there seems to be a trend in cell phones where they have 2 separate batteries, and this is claimed to increase changing speed. See "Oppo suggests that because the two batteries can be ...
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1answer
72 views

Is powering a 12v DC motor with 11.1 volts a bad idea? (3 * 18560 battaries)

I am working on an Arduino project where I will be controlling 4 individual 12 volt, 0.71 Nominal amp draw DC motors, the arduino will be separately powered with another power supply. I'm going to use ...
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40 views

Tesla Model S BMS Solar

I have six 2012-2018 TESLA MODEL S MODULES I have been using two in series for a 48 volt inverter with no BMS (set the low voltage and high voltage limits accordingly). Now that my energy needs are ...
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46 views

Shorted 18650 Li-Ion Batteries

I accidentally shorted three 18650, 3700 mAh batteries connected in series for about 2 seconds. I measured each cell individually with a voltmeter and they read very close to its original rated ...
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42 views

18650 Li Ion Questions

Good morning All, I'm obviously a complete novice as far as 18650 and Li-Ion or LiPo batteries is concerned although I do have a reasonable amount of knowledge as far as Electronics design goes, ...
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1answer
30 views

Connecting six protected 18650 cells 3S2p for close to 12V, suggestions?

I want to make a 12V range battery array with 2P 3S 18650 cells. The cells will be charged in an external charger NOT in the pack. They are removable in holders So I can pluck them out and charge ...
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1answer
88 views

Simplest circuit to light an LED in parallel or series to a Li-ion battery being charged

I have a very small TP4056 based li-ion battery charging circuit board. It has integral LED charging status lights, but I would like to add a remote LED to indicate when a battery is inserted and ...
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45 views

Battery Charging and Discharging rate

I did some calculations for hybrid renewable energy system and I calculated the energy from PV and Wind. Then I modeled a battery for both the PV and the Wind energy systems. I found that energy ...
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1answer
31 views

How to use a single DC battery meter display for multiple 18650 cells in DIY charger

I am building an 8-cell 18650 charger using 8x TP4056 charging modules and I would like to use a single battery capacity meter to monitor the current voltage and current draw for each cell ...
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1answer
36 views

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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2answers
63 views

Could this simple circuit charge li-ions in parallel?

My goal is to design a circuit that can reliably charge 3.7V li-ion batteries in parallel for extreme high current applications (think over 100 amps). Normally, I would just buy a cheap li-ion ...
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1answer
66 views

How do safely discharge Li-Ion batteries to check full capacity

I regularly have to test old phone batteries in my mobile phone refurbishment business. I need a safe solution to discharge 3.6V batteries. When I buy batteries they come from old stock so I need to ...
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1answer
38 views

Using a plug-in timer to extend the lifespan of a laptop battery

My 3.5 year old laptop is suffering from a swollen battery despite having completed only 100 cycles. It's been plugged in for at least 18 months, which I read likely contributed to its degradation. I'...
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1answer
33 views

minimum C rate of battery cells

What is the minimum C rating for li-ion battery cells? I am trying to charge 3.7V 10Ah battery pack with small 0.3W solar cell. I used LTC3105 DC/DC boost converter to boost voltage of solar cell to 4....
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1answer
97 views

Using 5V, 2 A charger to charge a 7.4 V, 5000 mAh Battery

I am designing a product that has a 7.4 V, 5000 mAh battery (Two li-ion cells connected in series). Is it advisable to charge it with a 5V, 2 A charger? If no then what are the issues which we may ...
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1answer
30 views

I have a five 12 V DC motors and I want to use an SMPS instead of lithium battery

I have five 12 V, 3 A DC motors and a lithium battery pack, 12 V, 30 Ah and an SMPS, 12 V 30 A. Can I use the SMPS as the motor power supply instead of batteries?
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1answer
32 views

How do we calculate the charging time of a Li-ion or a Li-Po battery if we used a fast charger?

Consider a rechargeable 7.4V 5000mAh Li-ion/Li-Po battery. If we were to fast charge this battery what would be the charging time? Although it is known that the general equation for charging time is: ...
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107 views

If a Li-Ion cell has 3000mAh capacity shouldn't I be able to pull 3A from it for 1 hour?

I have these brand new Li-Ion cells that are rated for 3000mAh and I'm trying to get their actual capacity. I have a discharger and its max current it can draw is 2A. However when I set that and run ...
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1answer
52 views

Relationship between depth of discharge and energy efficiency for a Li-Ion battery

Consider a lithium ion battery that is continuously cycled at different depths of discharge (say, 20% vs. 40% vs. 80%) and at a constant c-rate: It is well known that the larger depth of discharge ...
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1answer
47 views

What could happen to my cells? I overcharged them a bit

I left my 3.7 V Li-ion cells charging for a long time with a low current 5 V charger. Now when I check the voltage, it is at 4.31 V. The cells didn't get hot, not even warm, but I'm afraid of what ...
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1answer
44 views

TPS61046 wrong output voltage and high current consumption

I am designing a circuit to control a multiplexed led matrix and for that I am testing two boost circuits. The TPS61046 and the TPS61080. My idea is that the input voltage is via USB or a Li+ coin ...
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33 views

Why won't my hover board battery charge?

I have a standard hoverboard battery which I bought for my electric skateboard project. The battery has a 10s2p arrangement. 36V and 4.4 AH. Now the battery voltage is 20V. When I plug my charger in ...

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