Questions tagged [lithium-ion]

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

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Connecting lithium ion batteries in parallel

I have 6 lithium ion batteries that are from some Android tablets that I've recycled, they are rated as 5000 mAh, 3.8 V and have their own protection PCBs soldered to them. The tablets they came from ...
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25 views

Which standard must Li-ion battery fulfil for CE marking in late 2020, IEC 62133:2012 or IEC 62133-2:2017?

I am looking for a slim CE-certified rechargable battery to put in my product. All of the (very few) certified batteries that I have found are compliant with the IEC 62133:2012 (2nd edition). But that ...
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28 views

Does curling lithium ion battery plates change its performance or reliability?

If you dig into the technical details of how lithium ion batteries work, it discusses "intercalation" of the anode and cathode plates, which basically means that they have a nanoscale comb-...
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57 views

Replace USB diode with something else to reduce voltage drop

So I've made this circuit with a MOSFET and an Op Amp to select a voltage input to my battery. I sort of based it off the voltage selector circuit on the Arduino Uno board, but inversed since that ...
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2answers
45 views

Different capacity lithium polymer batteries in parallel

Is there any problem if I put different capacity,from different manufacturer with different specification? This is my current configuration: DW01 Protection Bord is being used on both. But power bank ...
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53 views

How likely is it for a small Li-ion battery to catch fire on it's own?

Today, I have lost a very small e-cigarette with 260mAh battery probably in an area with a lot of chaff and other flamable stuff, I'm really scared, tried searching everywhere but didn't find it! How ...
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17 views

Dead groups in 18650 li-ion battery - Negative 62Volt between B13 and B14 BMS wires?

I have an 18650 battery pack (12p20s) of which 2 parallel groups (12p) recently "died" (their current voltage is 0V or very close to 0 volt (1 of the groups is 0.0v and the other is 0.09v). ...
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1answer
42 views

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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1answer
32 views

How do I charge this odd 4S Li-ion circuit?

I am trying to make a battery pack that will power my electronics. I need to make +7V and -7V. The +7V needs to have a decent amount of capacity. I have proposed a 2S6P circuit for the +7V supply with ...
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24 views

How do bluetooth headsets handle 2C charging current?

I have used a few of those bluetooth headsets that are wireless stereo (TWS) ones and are charged by a case in which you insert them. I haven't used expensive ones, just rebranded chinese ones. All of ...
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33 views

Li-Ion/Li-Polymer Battery Charger mcp73871-2cci/ml Issue

Hope someone can help. I have designed a pcb board based on the mcp73871-2cci/ml. No matter what I change there is no current draw and all the indication LED’s remain on. I have seen some example ...
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551 views

Why does the Tesla battery module capacity not work out in calculation?

https://www.evwest.com/catalog/product_info.php?products_id=463 I am referring to the Tesla battery module listed in the above link. It says a single cell has the following specs: Nominal Voltage = 3....
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1answer
26 views

Is it possible to rapidly bring a cell back to equilibrium after charging/discharging by applying a current flow in the opposite direction?

This is an example electrical model of a generic Li-Ion cell. Image credit- https://www.researchgate.net/publication/260712260_Simultaneous_Fault_Isolation_and_Estimation_of_Lithium-...
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1answer
25 views

Is it ok to charge a battery with TP4056 while using it, if

Question Is it ok to charge a battery with TP4056 while using it, if the current consumption of the load isn't higher than the charging current of TP4056? and if not why? Trying: To have a 200mah Li-...
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Lithium Battery Pack Cell Arrangement: Parallel First or. Series First (4P16S or 16S4P)?

I am looking to arrange 64 individual LiFePo4 cells into a large 48V pack. So I can do 4P16S or 16S4P. All cells are new. I can add individual fuses to each cell if necessary. The capacity of each ...
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14 views

Discharging 18650 at higher Peak-Amperage than rated max continuous Amperage?

I am using Sanyo NCR18650BL cells. They are rated for 7A max continuous discharge, but i could not find any info on temporarily discharging them at a higher rate (for example 10A per cell). Is it ...
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1answer
34 views

Testing eBike Lithium-Ion Battery [closed]

My wife has an e-scooter, which she's had for about 1 1/2 years. Today she went to ride it and it died within a few minutes and it was, supposedly, fully charged. When we plugged the charger in ...
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31 views

Life expectancy of a CXY-B1 Li-ion battery

Last year I got a National Geographic Explorer 4 camera with two CXY-B1 Li-ion batteries (3.7V, 1000 mAh 3.7Wh). In one year, I used them both for about 7 hours in total over the course of the year (...
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1answer
40 views

Li-ion Battery pack not charging, but batteries have voltage

My robot cleaner stopped charging after a week of not being used. I gave the same error as when I removed the battery. I then measured the voltage across the battery terminals, which is 0.01VDC. I ...
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39 views

Is there a relation between the voltage of a Li-ion battery and its charge?

I have a Li-Ion battery-powered device (Wemos, an ESP8266 based) and I can read information about the voltage applied to its input. Is there a relation between this voltage and its remaining charge?
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1answer
38 views

Upsizing Li-Ion battery

I have a portable Bluetooth speaker with a very short play-time on a single charge and I want to know if I can swap the battery for a larger one. I've disassembled it enough to see that it's driven by ...
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1answer
42 views

2S BMS for Li-ion Battery not charging the batteries

I have been working on a small DIY project. Reference for this project is the following video from YouTube. DIY - 12V Mini UPS While I was able to put together everything and it works for most part, I ...
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2answers
59 views

Lithium ion battery CV mode

I am working on lithium ion batteries charging(NMC chemistry, max charge voltage is 4.2). In charging mode after cell reaching 4.2V, charger is going to CV mode and after this Charge ends(based on ...
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1answer
40 views

can you make a lithium battery pack with protected batteries

can you make a lithium battery pack with protected batteries? I know there is a protection chip put on lithium battery packs, which makes protected batteries in a battery pack unnecessary, but are ...
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26 views

Is charging current shared between Separate LiPo batteries wired in parallel?

I have two separate 2000mAh LiPo batteries (not RC type the standard 2 wire DIY component type https://coolcomponents.co.uk/products/lithium-polymer-battery-2000mah) Which I want to wire in parallel ...
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1answer
108 views

Using Buck Converter as Solar Charge Controller ? (see pic)

Can I charge Li-Ion safely by connecting PV Panels to a CC CV Buck Converter then through BMS to a 3S3P batteries? This is basically a plan for a very small solar powered device that takes in solar ...
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44 views

How do I prevent my BMS from tripping when solenoid is connected?

I am working on a project that is effectively just a battery powered reticulation system. It is charged through a solar array and cheap MPPT charger, which connects into the battery via the BMS. The ...
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1answer
37 views

Is it possible to chain BMS modules?

Let's say i have two 6S Lithium BMS modules (basically protection and balancing) and i want to create a 12S battery pack. Is it possible to chain the power lines of said modules? Just curious
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1answer
18 views

Lifep4 BMS and control

Any Lithium battery experts here? My concern is that there is a lot of work and specialized chips on BMS systems that specialize in balancing battery cells for large batteries. Lets say I have a ...
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2answers
28 views

Chaining TP4056 modules, the proper way

I know a similar question was asked before, but still, it didn't aswer what I'm looking for. I need to charge a series of 6 Li-ion cells, and maybe 12 in the future for a voltage hungry project. Since ...
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1answer
30 views

Should there be a clearance between a lithium polymer cell and a charging circuit?

I'm building a compact portable console that is going to use a 500ma charger board from Adafruit and possibly a 5v 1a boost as well. Past experience has taught me the chips on those little circuit ...
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38 views

Give a second life to a 18650 battery cell, which has 0.1 V?

I have a 7.4V battery pack consisting of 2 x 18650 cells. One of them has 3.4 V, so I tried to charge it with a good old TP4056 board, and it worked: The second 18650 cell seems nearly dead with ~ 0....
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1answer
56 views

Would this design for Li-Ion cell protection+balancing circuit work?

My team and I are currently trying to design a 2S2P battery pack for use in a CubeSat (student project). The pack is planned to be used with 30-40% depth of discharge for a total of around 5800 charge-...
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1answer
30 views

Integrating 12v “ups” to a portable fridge

I want to make a portable fridge more portable with Li ion batteries and I'm thinking about how to connect all the pieces. Load is rated for 12V 5A / 24V 2.5A, there is AC/DC SMPS that outputs 13.2v ...
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1answer
43 views

Individual cell balancing on multiple packs

UPDATED: I edited my question to clarify I'm building a 4s4p pack with 18650's. What is the best method to achieve on a per-cell balancing & protection if that makes sense? Most of the 4s BMS I ...
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2answers
72 views

Connecting 4 18650 batteries in series without bms

I have 4 batteries (18650) 3.7 volt each and i want to connect them in series to get around 15 volts, can i do that without having a bms? Just directly connecting them together? Note: i do have a ...
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36 views

How to tell a battery is LiPo or Li Ion (based on apperance)?

I have this battery and I don't know it is lipo or li-ion: Is there any way to tell a battery is lipo or li-ion based only on apperance?
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85 views

Li-Ion UPS for a 12V 1.5A Router

I know this question has been asked quite a few times on this site. The closest one i could find is: make-9v-ups-for-router-with-tp4056-and-mt3608. While there are UPS systems designed for routers, in ...
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30 views

Strange behaviour of TP4056 when charging complete

I am using a TP4056 to charge a 18650 LiIon cell as shown in the circuit below. The BAT output is connected to the 18650 cell through a BQ29700 protection IC. According to the datasheet of the TP4056, ...
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36 views

Lithium ion pack showing 0V after BMS/protection circuit but pack is actually 40V

I recently purchased an electric skateboard and I ended up having some issues with the board turning off as soon as it started to move. I figured that there was an issue with the lithium ion pack so I ...
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3answers
132 views

Can we do better than CCCV charging?

For some background, most if not all modern charging solutions for lithium ion batteries use a CCCV model for charging: As the diagram explains, we charge at a constant current, and then "...
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1answer
36 views

Can i charge an LiFePo4 32650 cell using an 18650 li-ion charger

i have this li-ion 18650 charger i found, pic attached below. I need to know if i can use this to charge a LiFePo4 32650 cell i bought here, the cell doesnt fit in due to the obvious differences in ...
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23 views

Resetting Li-Ion battery protection PCB without disconnecting the load

Given is an 18650 Li-ion battery with built-in protection PCB. It is used to power an electrical load and can be charged by a dedicated Li-ion battery charger. In the schematics below, the battery is ...
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1answer
37 views

Li-ion built-in vs external protection

Many Lithium Ion batteries have an internal chip (a protection circuit I guess). Are External protection circuit (like the TP4056) really necessary due to internal chip? I can't find the answer on ...
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1answer
38 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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1answer
35 views

max Discharge current of li-ion battery (temporary)

Is my assumption correct that the main limiting factor of maximum discharge current of a Li-ion battery is that the cell heats up too much due to its internal resistance/the current flowing through ...
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1answer
30 views

Lithium ion battery pack charge current

I am designing battery charger and I want to know how to calculate max charging current for a lithium-ion battery pack. I am using Texas Instrument Chip bq24616 and their evaluation board. Assumption: ...
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2answers
53 views

Charging batteries with a PCB Charger

I have a 4 slot battery holder with 2 wires coming out of it, best I can describe it. I'm planning to get a 14.8V Li-ion PCB charger (of course this will be used with 3.7V Li-ion batteries). One thing ...
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0answers
48 views

Replacing a Li-Ion battery with a capacitor and power supply in a bluetooth speaker

I have a Philips BT3500 speaker with a dead Lithium Ion battery. I want to be able to use the speaker without the battery - using just the power supply. It used to work for some time with the usb ...
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2answers
46 views

Li-ion battery charging circuit [duplicate]

Please I have some couple of 3.6v 3Ah cylindrical li-ion battery, but since I bought them, charging it became a huge problem. I first connected a single one to a 2A infinix phone charger (made in ...

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