Questions tagged [lithium-ion]

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

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34 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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50 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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1answer
41 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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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
30 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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0answers
43 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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0answers
23 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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0answers
31 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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4answers
545 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
2k 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
208 views

Is a special charger required for Li-ION battery packs with a BMS?

I am replacing the lead acid batteries in an electric scooter and a kids electric motorcycle, in addition to building a 48V eBike battery pack. The (3) units require 24v, 36v & 48v respectively ...
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22 views

How to locate specs for the pinout of an obscure HP internal UPS battery pack? [closed]

Thanks in advance for any advice, including pointing me to a more appropriate place to ask this question. I bought some battery packs originally thinking I'd pull out the 18650 cells and build a ...
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2answers
774 views

Calculate the Li-ion battery remaining capacity

How can I calculate the remaining capacity (exact or approx value) of a Li-ion battery by measuring its voltage. The battery is connected the load and i know only the battery voltage and the value of ...
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1answer
25 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
23 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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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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2answers
866 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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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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25 views

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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0answers
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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0answers
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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5answers
10k views

Lithium Battery Pack - Do I need BMS within parallel connections?

Let's assume I am going to build a Li-ion battery pack with 12 18650s, where I connect four cells together in parallel and then the three sets of four in series. My understanding is that a BMS keeps ...
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2answers
176 views

ESP8266 (esp-07) powered by battery(s) for at least 1 year

Hey all I am trying to see how long I can possibly have a ESP8266 ESP-07 operate with only 1 or 2 of the Lithium-ion Battery 18650 Cell which claims to have 2600mAh. I am making a window alarm sensor ...
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1answer
41 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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1answer
613 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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2answers
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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2answers
602 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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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
115 views

18650 pack building - is it better to have similar batch or similar capacity?

I'm gonna build battery packs. I have quite a lot of experience with 18650 Li-ion cells, but there's one thing I still don't know. I will buy CCA 100 new cells from seller (for example LGEBHE21865). ...
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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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2answers
5k views

How fast can a Li-Ion battery be charged?

So far I've seen many Li-Ion battery chargers that do the full charge in about 1,5 hours or more. There're also NiMH battery chargers that claim they charge a NiMH battery in 15 minutes and then the ...
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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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2answers
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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3answers
7k views

Charging li-ion cell using constant-voltage only

Introduction Various resources [1] [2] state that the optimal method of charging a li-ion cell -- such as one found in a mobile phone -- is to charge at a constant current (usually <1C) until a ...
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1answer
1k 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 am not able to get the voltage at its output pin. The circuit can be ...
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1answer
258 views

Drone Thermal Imaging solution: Power Supply Module - Design Review & Load Sharing Query

I'm designing a DIY Thermal Imaging solution for my DJI Mavic Pro drone. Whilst the full design has been included for background info, this post refers to the power supply module design. The pertinent ...
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1answer
103 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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1answer
477 views

How can I limit the current drawn by a Li-Ion battery pack BMS?

I have a Li-Ion battery pack made with twelve 18650 in a 3S4P configuration, using an off the self Battery Management System (rated for 25A), that I purchased on aliexpress. I tried to charge it using ...
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1answer
110 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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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
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
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
576 views

How to use CC/CV Charger with a DC/DC converter

I am searching for a solution to charge a battery pack (7S1P)[ICR18650] with a charger with CC/CV mode and I have a BMS for protection (I've done research to maximise the security of the battery pack)....
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2answers
27 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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1answer
245 views

Help me to understand VOOC fast charging for lithium ion batteries?

I know common VOOC charger have fast charging rate of 18W(9V/2A). But how it possible even current is only 2A. I mean 2A current have only stored charge 2000mAh(2A*1h). How changing voltage can charge ...
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0answers
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
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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2answers
212 views

Li-ion CR2 / 15270 voltage and charging circuitry

CR2 / 15270 Li-ion batteries normally come as 3.0v. I thought Li-ion and Lipo batteries were always 3.7v, how is that possible? Does it require a different charger circuit than normal 3.7v li-ion/...
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2answers
1k 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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