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Questions tagged [lithium-ion]

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

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48 views

Does charging near maximum C rate have the same effect as high battery levels?

We know: The maximum C-rate decreases with the increasing charging state. Let's assume an 2 Ah Lithium-Ion or Lithium-Polymer mobile phone battery. (2 Ah is considered tiny in 2018, but this is just ...
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3answers
3k views

Do I need a BMS for Li-ion batteries connected only in parallel? [closed]

I have a device that runs on a single cell Li-ion / LiPo. The physical case for that device allows me to put in one to three 18650 cells. Unfortunately given the disposition of the cells, I can't buy ...
3
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1answer
1k views

Using a multimeter, can I tell if a lithium-ion battery pack is brand-new?

A few years ago, I ordered a replacement cell phone battery from Amazon, and while it worked, it didn't last as long as I expected. I wondered if the seller had scammed me by selling me a battery that ...
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1answer
28 views

Can I charge 1 cell Li-ion battery with a charger for 2 cells?

I'm designing a battery charger using monolithic step-down battery charger that operates over a 4.95V to 32V input voltage range. On the datasheet I found a typical schematic for 2 cells but using ...
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3answers
174 views

Balance of current through oring diodes

I’m curious about current flow through an oring diode configuration. I’m using oring diodes to “autoselect” between two power sources: a 4.2V (max) battery, and a 5V USB line. The battery has one ...
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1answer
350 views

MPPT charging a li-ion battery

I just designed this MPPT solar charge controller which outputs 4.2 V regulated via MPPT, it uses the SPV1040 IC. This will be used on a satellite with 4 side panels, each with 8 solar cells in ...
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1answer
49 views

Charging and Using a Lithium Battery

I’m using an Adafruit micro-USB Charger connected to a standard 850mAh LiPo battery. I would like to know if it’s safe to charge the battery while also using it. The circuit that the BATT and GND pins ...
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0answers
19 views

Dedicated li-ion step up drivers

I have a design which will include the optional use case of boosting up to 7V from a li-ion battery. I can't seem to find any drivers dedicated to li-ion for this? There seem to be a few buck boost ...
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0answers
55 views

Li-ion battery and arduinos custom circuitry

So i have to design a board around a dialog SOC (DA14681). The dialog part supports li-ion batteries, it has a charger and fuel gauge and USB detection (to power device in case both usb and dc ...
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2answers
85 views

Charging a lithium-ion battery with 5V but stopping at 4.2V

I just want to charge one lithium ion cell, but don't have the right equipment. I only hear it's possible to charge one if you use 4.2V, but that's only, because a higher voltage means higher current ...
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1answer
109 views

charging lithium ion battery of 3.7v

I have a device in which I have used 3.7v of the lithium-ion battery for power supply and for charging this battery, I am using a tp4056 module. when I connect a battery to tp4056, battery fully ...
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100 views

BQ24133, unable to charge the battery

I have designed the circuit around BQ24133 and in my humble opinion, chose the right components while following the datasheet. I had the PCB made, soldered the components and started testing. The next ...
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1answer
32 views

Adafruit USB LiIon/LiPoly charger - v1.2, charging multiple batteries with series output WITHOUT switch?

On their documentation page, Adafruit offer a tutorial for using it with 2s li-ions. However that also required a 3pdt switch, which would have to be manually thrown. Since in my project I will not ...
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1answer
317 views

Lithium ion battery protection IC not able to drive MOSFET

I have integrated the TP4056 charger design into my PCB, The problem is that when i connect the battery at the battery terminals, i could not able to get the voltage at its output pins, the circuit ...
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1answer
207 views

Power bank charging using a solar panel

I'm trying to charge a power bank of 5V, 5000mAh, using a solar panel 6V, 14W. I have made the connection from the solar panel to a DC-DC convertor (specification: 3-37V, 3A) which steps down to a ...
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1answer
110 views

How can I make a battery pack with 6 18650 Li-ion that is USB rechargeable?

I'm new to electronics and DIY stuf but I wanted to make a Bluetooth speaker and there for I need a battery pack. I looked up a lot of information on the internet but couldn't find how I could ...
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1answer
88 views

How to keep a small Li-Ion battery on float for backup service?

I have a number of small electronic widgets (similar to small arduino boards) that generally draw 100uA-10mA avg with infrequent 50mA-100mA peaks (e.g. radio or cellular TX) and for some I'd like to ...
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3answers
44 views

li- ion battery discharge query

In a 3.7V 2000mAH Li-ion 18650 battery, does it mean that the battery can deliver upto 2A for 1hr depending on the load...Or it will deliver like a constant current source which will deliver 2A for ...
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2answers
147 views

Importance of the constant voltage charging of li-ion

Hello everyone is it necessary to have the constant voltage (CV) process when charging 18650 li-ion batteries? What happen if I usually skip the CV? Does the li-ion battery got memory? I know the ...
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2answers
250 views

Charging a 4000mAh Li ion battery using multiple TP4056 ICs

As single TP4056 IC rated current is 1A,so I was thinking to connect multiple TP4056 ICs in parallel, such that enough current can be sourced to charge the li-ion battery(400mAh) connected. Here is ...
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0answers
50 views

lithium ion battery capacity loss across different storage charge levels over time

We can see this simple chart in many places, however I am curious to know how the numbers work out for different starting charge levels than 40% (3.8V, ish? for li-ion). For example, how much worse ...
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2answers
52 views

What determines the current drawn by phone battery? Phone (load) or charger or both? [closed]

What actually determines the current drawn by phone battery? Is it the phone battery (load) or the charger (supply)? For instance, the charger that came with my phone reads 1.5 A. Also, I have two ...
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1answer
261 views

Is it possible to charge 18650 battery using 1.5A?

Hi everyone I got four 3400 mAh 18650 batteries (specs see the pics) can I charge them use the charger that's 1.5A*4 output (charger specs also see the pic)? The charge time will be 3400/1500=2.26 ...
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1answer
623 views

If I have two 18650 Li-ion batteries with different capacities, can I charge them using the same circuit?

I have several 18650 Li-Ion batteries, many with different capacities. Can I charge them with the same charging circuit (5 to 3.7 V 1 A buck converter)? Can I put them in parallel and use the same ...
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1answer
60 views

LM350 as current supply with Li-ion batteries

I am trying to make an circuit to control max current using LM350. The power source is Li-ion 3.7v 2200mAh battery. I hope to add max current controller and `small push button to turn on output. How ...
4
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1answer
388 views

TP4056 heating very badly

I’m charging a Li-ion 3.7 V, 3500 mAh using a TP4056 charge controller IC and feeding a 6 V, 9 W monocrystalline solar panel to charge it. When I connect the solar panel at good sun light at 2 PM in ...
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2answers
48 views

Lithium-Ion - leave at full or charge and discharge [closed]

I am getting a laptop soon, and am wondering if I should leave the Li-ion battery at full during use, or have it charge and discharge within a range of, say, 40-80%. The goal here is maximum battery ...
0
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1answer
53 views

Li-Ion Battery Charging Board Temprature (Junction Temp)

I'm looking for a little help with a simple battery charging project. I've bought a pack of cheap USB charging boards on ebay (link) with the intent of using one to charge a small Li-Ion battery. ...
2
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3answers
144 views

How to estimate Li Ion Battery SOC?

In a simple model of a renewable energy system, I have a residential inverer and Lithium ion battery system with a round-trip efficiency (for inverter and battery, i.e. ac to ac) of 89% (at 25 degrees ...
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2answers
63 views

Electric Vehicle Charging [closed]

I have a few queries related to EV charging: (1) When we refer to 'X kW' charger, is it that the charger is taking in X kW power and delivering power = X kW times the efficiency of the charger to the ...
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0answers
35 views

How to lower voltage on condition

I have 16.4V out of a 4S4P Li-ion battery pack when fully charged, even if the voltage drops quickly when using it, my device can't take above 16V. So I need the output to be always below 16V, is ...
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0answers
51 views

12V Converter for li ion battery pack supporting 16-20 Amps

I built a 4S Li ion battery pack and I need 12V output at 16-20Amps but I have limited space (70mmx55mm). 12 V would be the best but I could also just reduce the max output from 16.8V (4x4.2V) to ...
0
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1answer
880 views

Laptop battery and adapter voltage ratings

Considering a 4-cell (laptop) lithium-ion battery, the cell voltages add (since they are in series) to 3.7 V * 4 = 14.8 V. However, the adapter says that it has a 19.5 V DC output. I want to know why ...
2
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2answers
69 views

How to test a Lithium-Ion charging IC?

I'm using an LTC4155 (datasheet) in one of my USB-based circuits to charge an on-board Lithium-Ion battery. I'm aware of the nitty-gritty details when it comes to selecting charging current, matching ...
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1answer
60 views

Can I use dc-to-dc converter to step up voltage of 20 3.7V 3Ah lithium-ion batteries connected in parallel?

I want to use this 3.7V 40Ah powerbank to power my e bike's 48V hub motor. So would it be a bad idea to step up 3.7V all the way up to 48V? Would there be a huge Ah loss?
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2answers
88 views

E-bike battery: upgrade 18650 cells [closed]

I have an e-bike battery of capacity: 4.3Ah (Li-ion). Specifications: http://industrial.panasonic.com/cdbs/www-data/pdf2/ACA4000/ACA4000CE285.pdf For charging, the label on battery says "Rating 25.9V ...
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0answers
82 views

Master switch placement for Li-ion charging circuit MCP73871

I am designing my first Li-ion charging circuit, based on the Adafruit Powerboost 1000C, and this is what I have so far: I am probably going to also add a way to read the battery voltage based on ...
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2answers
340 views

Li-Ion Power Pack vs Deep Cycle 12V Battery?

I've seen a number of videos on YouTube where people have built a "Power Box" by putting a 12V deep cycle battery in some kind of weatherproof box with a charging equipment and added various switches ...
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1answer
57 views

Battery Pack Life Rating

I am working off of a schematic where I was given a battery pack with the following specifications. The battery being used is a panasonic NCR18650 lithium ion cell. https://engineering.tamu.edu/media/...
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2answers
121 views

18650 discharge protection

I've converted an existing 18v DC battery pack (for a power tool) to use replaceable 18650 cells. My plan is to charge the cells in a "smart charger" and discard the OEM charger. I'm only getting ...
2
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2answers
138 views

Powerbank not charging

I got a cheap powerbank, which didn't work at all, so decided to look inside it. There is a control IC AP5900, what I found about it is a chinese website: http://www.chipown.com.cn/en/case.asp?id=24 ...
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0answers
227 views

Is this a temp sensor on my battery pack?

I am trying to modify a battery pack for a Ridgid nailgun to use replaceable 18650 Li-ion batteries. The original pack looks like this: I've printed an adapter which holds 5 cells and wires to the ...
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0answers
39 views

Intrinsically Safe Li-Pol batteries to 60079 standards

I have recently been looking at SAFT batteries and they have a range of Li-Ion batteries, such as the MP-144350. One advantage quoted is "High level of safety, compatible in potentially explosive ...
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1answer
24 views

Possibility of series connected LIPO batteries for running stepper motor

I have project where I am using a motor driver DM860A2 to run NEMA 34 85 kg-cm stepper motor. Currently I have used a transformer to supply 48V AC during testing. I have with me four 2200 mah 11.1V ...
0
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1answer
41 views

Lithium-ion battery charging and discharging

I want to discharge a 3.2 V (600 mAh) Lithium-ion battery. Will the battery voltage go down if I discharge the battery? I have a Computerized battery analyzer (CBA-II) to discharge the battery. In ...
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0answers
227 views

Li-ion charging circuit

I have a project that I want to power with a single cell lithium ion battery, which is to be charged from a USB plug (but not from a laptop or computer, rather from a wall supply like a phone charger)....
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0answers
61 views

Is the mobile charger capable of charging an SLA?

The referenced article over on http://www.instructables.com/id/4V-Lead-Acid-Battery-Charger/ indicates a Li Ion charger for mobile phones may serve to charge a low AH SLA. I held the impression a Li ...
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1answer
2k views

Can I store lawnmower Li-Ion batteries in cold storage during the winter? [closed]

I purchased a Li-Ion battery powered lawnmower. I'm not entirely sure what the actual exact battery chemistry is, but I believe it is not lithium iron phosphate due to its voltage typical of non-...
0
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1answer
55 views

connecting different capacity batteries in paralell [duplicate]

I have 12 li-ion batteries but in different capacities. Half of them is 2000 mAh and half of them is 6000 mAh. What happen if I parallel them?
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2answers
231 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. ...