Questions tagged [lithium-ion]

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

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12 views

Charging and discharging 18650 batteries with TP4056 modules via their battery terminals

I'm having those fancy ESP boards that come with a battery input pins/holders that can be connected to a battery to make them portable. They also have a dedicated USB port for charging/sketch uploads. ...
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3answers
83 views

Charging a lithium battery to 4.34 V

I recently came across a device (a headlamp) with lithium-polymer battery, which is marked 3.8 V nominal voltage, instead of usual 3.6-3.7 V. It's charging circuit is based on ME4057D chip, which is a ...
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1answer
24 views

Li-ion custom protection circuit module (PCM) design and de-rating

I am designing a custom PCM (protection circuit module) for Li-ion cells provided by a supplier ( they offer PCMs but they do not meet our RF immunity spec ). The supplier-provided PCMs have a charge /...
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22 views

Li-ion charger (MAX1737) input current limiting

I have been protoyping a 3S1P Li-ion charger for myself and it turned out pretty well except for the fact that I cannot get input current limit to match the expected (calculated) value. In my case (...
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23 views

Can I use a two wires BMS to charge a battery without the Balance wires connected?

I bought a new 10s BMS (with Bluetooth) to replace a damaged one of my ebike battery but I did not understood that the Balance Cable was different. Also the new BMS only have 2 thick wires. B- and C- (...
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44 views

Help needed with weird battery behavior at first charge

I bought 28 new 18650 LG INR18650MH1 from NKON and built a battery pack for my ebike in 7S4P configuration like it's shown in this GreatScott's video: https://www.youtube.com/watch?v=b2sBhDxmPmA All ...
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1answer
122 views

Does keeping a mobile phone plugged in increase its battery's lifetime?

As far as I understand, keeping a mobile phone plugged in would draw current from the source (i.e. an USB port) rather than from the battery. Therefore, the battery would not be used as long as the ...
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50 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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70 views

Li-ion Swollen battery dangerous or not?

I have a Wifi AP and its Li-ion battery has swollen so much that its cover cannot be put in place over it now. Its working but its backup time has reduced to 20%. I cannot put on the battery cover ...
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52 views

How to charge and use a salvaged laptop battery with BMS?

I have salvaged a laptop battery but I have no idea how I can use it like a normal battery. It does have a 10 pins connector but I have no idea what they are doing and how I can use them. Should I ...
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37 views

Trying to understand Battery Chargers vol.2 [duplicate]

The answer by Bill dubuque was very helpful and got me to read the complete datasheet of MCP73831/2, but there is one thing from the datasheet that I don't fully understand and is the cause of lots of ...
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31 views

Is it possible to charge Li-Ion Cells in series without a Balance Charger, by using slightly lower 4.1 V per cell charging rate

I have read that it is strictly not recommended to charge Li-ion cell packs in series without using a balance charger. My question is, can a balance charger be avoided by keeping the total charging ...
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90 views

Is using water to douse a reacting lithium battery safe?

I've been reading on safety protocols on Li batteries and I seem to remember that Lithium itself is extremely reactive to water. However, FAA regulations recommend using water to douse the device to ...
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25 views

TP4056 - Li-lon Battery Charger enable pin not working

I designed a small lithium battery charger with the IC TP4056 but apparently the enable pin (CE) is not working. My setup is depicted in the following block diagram: Basically the input voltage (...
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31 views

Can I Charge With An MCP73831?

Sometimes I need to take my laptop places and, it doesn't have the greatest battery life, sometimes maybe it only lasts 10 minutes. So after researching a bit I decided I wanted to build a li-ion ...
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97 views

Does 1200mAh Lipo battery will kill my circuit? help me to read the data sheet please!

I've found old arduinio project from Gitlab which runs the circuit with Lithium Ion Polymer Battery - 400mAh Unfortunately i wont be able find any Lip 400mAh in my country.Lucky enough i found one ...
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88 views

What would be the most efficient way of wiring a solar power bicycle?

I have an electronic bicycle; 350 motor that runs off a 17.5 Ah battery at 36 volts. I've just ordered three 12 volt, 150 watt solar panels, that I'll wire in series to total 450 watts; giving 12.5 ...
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72 views

How to connect 3 cell series Li ion charger and protection IC for each cell?

I am using max745 4 cell Li-ion battery charger to charge 3 cells in series. I want to put additional protection IC for each cell (NCR18650pf). Because I need to run the max745 always on as a backup ...
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2answers
130 views

Homemade Li-ion charger

I am trying to build a lithium battery charger (Li-Ion) for charging banks of 6s batteries of varying capacities (2-30Ah) from a varied DC input. Given that I need to supply CC/CV to charge these ...
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98 views

Please check my solar outlay for Lithium ion battery

I'm in the processes of 'solarising' my electric bike, and would appreciate a more experienced opinion on how I intend to do it. The motor is a 350W running off a 36 volt battery. I intend to get ...
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93 views

Is there a risk of 18650 li-ion battery explosion in a low current application?

I have several used 18650 batteries from my old laptop battery. They all look OK, I have charged them and discharged. The capacity is around 1700 mAh, nominal capacity was 2500 mAh when new. I'm ...
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83 views

Lithium ion (Li-ion) vs. Lithium thionyl chloride (LTC) battery?

I need some consultation on which battery of the two to use for the GPS trackers I'm designing. My trackers wakeup when there's movement only so they're not on all the time and they have low power ...
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1answer
52 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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60 views

Charging a Li-Po with a solar panel

I'm looking to setup my e-bike touring bicycle with a solar outfit so that it can charge on the road, but am unsure of the electronics. I appreciate the size of the panel will be huge, but this can ...
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3answers
67 views

How to use a gas gauge?

I must have missed an article, lesson at uni, or something obvious because I'm struggling to work out how to write some firmware to use a gas gauge to get out a rough percentage of battery remaining, ...
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31 views

Dual N-channel mosfet Rdson value

I'm going though datasheets of some dual N-channel MOSFETs for li-ion battery protection, like 8205A or ECH8695R, for some thermal and power dissipation calculations. There are Rds(on) values, like ...
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42 views

Current and voltage increasing with duty cycle from buck- converter

I am designing a 2s Li-ion battery charger using a buck converter from a 10W (18V, 0.55A) solar panel. So I understand that the duty cycle controls the ratio of the input power vs output power and ...
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1answer
19 views

Under-voltage lockout programming on Delta D12F200 DC/DC converter

I recently decided on the Delta D12F200 DC/DC converter for my current project (datasheet: https://www.mouser.com/datasheet/2/632/DS_D12F200-1141659.pdf). My project will be powered by lithium ion ...
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30 views

Balanced Charging of ZOP 2s lithium ion battery

Good day everyone, I recently purchased a “ZOP Power 7.4V 2200mAh 2S 35C Lipo Battery T Plug” for a project. I have designed a circuit to charge the battery, but now I am wondering if it is necessary ...
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32 views

Short circuit protection of lithium pouch cells in parallel

I want to put together a battery pack with 2 or 3 lithium pouch cells (for example SLPB11543140H5) in parallel, and a few more in series. Of course they have to have some kind of short circuit ...
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67 views

LTC4054 Odd behaviour

I have included a LTC4054 IC in my project and here is how the circuit is. I purchased it from here The schematic is uploaded on github. The chip has 5 pins Pin 1 CHRG- connected in series to a ...
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82 views

Switching between two completely independent circuits

Background: I have built a 2S 7.4V battery out of two 18650 batteries. I have some TP4056 (5V 1A Micro-USB) charging modules lying around. I would like to use these the TP4056 modules (one per 18650) ...
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1answer
70 views

Converting a 9.6V NiCad Drill to Li-on [closed]

I am trying to convert my 9.6V NiCad drill to run off a 12V Li-on battery. When I connect the Li-On directly, the motor only just slightly spins and stops. The only way I can get it to work is using a ...
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61 views

Does a lithium battery make a good ground plane?

A patch antenna I'm using calls for a 50mm x 50mm ground plane under it, mostly to cut multipath reflections in the bottom lobe. Naturally, the closer to the antenna and the more conductive the ground ...
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43 views

3V to 20V DC - DC boost converter help

I am sorry if this question has been asked before, I couldn't find exactly what I'm looking for. TL, DR: I'm looking for a way to boost 3V to 20V that: Works from a single cell lithium ion battery ...
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1answer
35 views

li-ion battery managment system, cell protection difference?

Could you help me to clear up what the battery management system/BMS adds to cell level protection, what is the difference? I assume that if I have many cells in series if I only have cell protection ...
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102 views

AC water turbine

I am trying to use a water turbine from China to charge a lithium ion battery. The water turbine is rated to 10 watts. I figured that should be enough to charge the battery but I can only ever get ...
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2answers
94 views

Buck converter for Li-Ion 2s battery charger

I'm currently doing a project that requires the charging of a 2s Li-Ion battery. I have an 18V 10W solar panel that I want to charge my battery using a buck converter. Im controlling the switch and ...
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3answers
124 views

Why doesn't the voltage drop across the resistors of my battery charger follow Ohm's law?

Here's the setup, the three items below are in series: Battery at 215V Power supply at 250V (It is a 5A constant current power supply that will drop voltage down to 200V minimum before failing) 8 ...
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37 views

Two solar panels with separate battery or one panel with one battery?

I have already bought a 12 V 40 W solar panel. Its controller is also on the way. I will be using it to charge a lithium ion battery pack of 12 V 13 Ah. The charge controller ...
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57 views

replacing a lithium ion battery protection circuit

I read several other postings regarding BMS's but as this is my first attempt to use them and I guess it can be a fire hazard choosing the wrong part, I'm going to ask: I have a battery-powered LED ...
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1answer
42 views

1S or 2S li-ion battery charging design for ESP32/Nextion device

I am designing a portable battery powered device and trying to decide on my battery configuration. It will use an ESP32 chip with a few additional ICs, which will draw about as much current as an ...
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30 views

Seperate protection circuit for charger and system for Li-ion battery

I'm thinking of using the BQ2971x for battery protection. http://www.ti.com/lit/ds/symlink/bq2971.pdf One thing that anoys me is that most batterys (18650 Li-ions) usually have a lot higher ...
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64 views

How to protect Li-Ion battery from a defibrillator pulse

I'm working on a design where the rechargeable Li-Ion battery is placed closely (attached with a magnetic connector) to a body-worn contact. The concern is that in an event of a defibrillation, the ...
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52 views

help building 6S2P balanced Li-Ion battery pack

I'm trying to build a 6S2P balanced Li-Ion battery pack for a quadcopter using LG 18650 HG2 cells with pre-soldered nickel strips (1st image) so that I won't solder directly on the cell's terminals. ...
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66 views

TP4056 with DW01, can I use a diode to create an “UPS”? Design review

I'm studying lithium cells and their related mainstream modules. One of the most common -yet wrong- use of the TP4056 module is to use it with the USB 5V input and an active load on the output (at ...
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2answers
42 views

Should series connected battery cells have similar internal resistance and to what degree?

I have some Toshiba SCiB cells that I wish to string in 4s configuration. These are Lithium Titanate (LTO) cells. They have a 20Ah capacity and operate safely between 1.5 V and 2.7 V. The cells were ...
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32 views

check remaining charge of 28V 5Ah Li-ion battery via ESP32

I'm currently doing a project where I have to power some LEDs from a battery remotely. It's done with an ESP32 and the whole system is powered by a 28V 5Ah Li-ion battery. I am using a DCDC-Converter ...
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2answers
133 views

Should I add insulation to lithium ion battery

I have purchased a 36v 10ah lithium ion battery for use with an electric bike. I live in rural Australia where it gets very hot in summer and fairly cold in winter. I considered insulating the ...
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104 views

Disconnecting TP4056 DW01A from load when plugged into USB

I have adapted a load sharing circuit that was posted online that uses a MCP73831 to charge a Lithium battery. In my case I wanted to to use the TP4056DW01A and connect its output to to a boost ...