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Questions tagged [lithium]

Lithium batteries are disposable/non-rechargeable batteries, often found in button/coin-cell form and sometimes in cylindrical cell form. Lithium batteries are used in portable consumer electronic devices, including watches, cameras, calculators, thermometers, etc.

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What is the role of the MOSFETs in this PCB protection circuit other than as a CFET/DFET?

I want to learn the role of the MOSFETs here in this teardown video. As mentioned in the video it is part of the protection PCB for a powerbank.
Braian May Capitulo's user avatar
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Options after breaking USB-C jack off of PCB

Hello! Snapped the USB-C jack off of my Logitech MX Keys. I have a background in computer engineering and some experience doing board-level repairs. I do have an SMD hotplate, multiple soldering ...
Mikey's user avatar
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Preventing current between batteries

I charge 2 lithium Ion boat batteries from a single solar regulator. I have the positive leads from both batteries in common to the regulator and charging is fine. But if charge current is low I want ...
George Losey's user avatar
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1 answer
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Lithium polymer battery size versus energy density

I am building a small device that needs to use a rechargeable lithium polymer battery. The dimensions I am looking for are 351125 { 35 mm (H) x 11 mm (W) x 25 mm (L) }, which is the standard way these ...
Sreenivasa Chary's user avatar
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1 answer
171 views

Lithium iron phosphate battery charging for single and multiple 12V 7Ah batteries

I want to charge my lithium battery as shown below, but I first want to explore going down the route of making my own PCB before I decide to buy an off-shelf device. I want to charge the battery at a ...
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2 votes
2 answers
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Explanation of the schematic for the BQ25703A charger

I am trying to build my solar charger to charge my lithium batteries. The lithium batteries already have a BMS on them. I am using the BQ25703A IC from Texas Instruments. Datasheets: BQ25703A BQ2570X ...
JoeyB's user avatar
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How does this lithium battery charger 3S work?

I am trying to figure out how this lithium battery charger works. How exactly do those discharge/bleeding resistors work? Are they only "activated" when no power is present so that each ...
JoeyB's user avatar
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1 vote
1 answer
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Li-SOCL2 battery undervoltage protection

Working on a long-service device powered by Li-SOCL2 primary battery. I've gathered safe cutoff voltage for this battery chemistry is 2V, so due to that and other reasons I'm aiming for 2.3V cutoff. ...
Drone601's user avatar
2 votes
0 answers
67 views

What is the formula for maximum battery pulse vs pulse duration?

I am interested in finding the maximum current a lithium-ion battery can provide for pulses in the order of 50 ms. If my battery can provide 50 A continuously and 120 A for 10 seconds, how can I find, ...
Greg Sorter's user avatar
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2 answers
280 views

How do DC/DC converters work as lithium battery chargers?

There's a lot of DIYs that utilize DC/DC converters to charge Lithium batteries. A quick Youtube search shows dozens of these DIYs. I was wondering how these home-made chargers work. Yes, DC/DC ...
GIZ's user avatar
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Is my 4s2p pack connections correct?

I'm planning to build my 4S2P battery pack using 18650 lithium-ion battery cells. I need to make sure my connections and my battery pack is correct and safe before I make the connections. Here's the ...
Tune333's user avatar
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How to clean water damaged Lifepo4 batteries

What is the best way to clean water damaged rusted lithium Lifepo4 batteries? I have six used 16sXp 48v 5kwh server rack batteries that look to have been sitting in water and have rusted. There is ...
Justin Graham's user avatar
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1 answer
68 views

Litium Battery Series-Parallel 2S2P Protection

I am designing a PCB which has 4x Primary Lithium cell Batteries (ER14505M) two in series and two in parallel to give 7.2 V 4400 mAh. The cells have their own holder so it would be possible to only ...
Mike's user avatar
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I would like to use two BMS's on a single pack

I would like to use TWO BMS's on a single lithium pack. putting them in parallel. Q is - do i need to also run separate balance wires to each BMS , OR, just run the 2nd separate B- input to the 2nd ...
Lithium Moto's user avatar
1 vote
0 answers
86 views

Adjust lithium BMS over discharge voltage

I have a few 2-series lithium battery protection modules coming from different sources, but all of them are the same classic chinese ones based on Hycon's HY2120 chip. These are all shuting down at ...
Javo Agarre's user avatar
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1 answer
125 views

24v Electric car kiddie regen brake issue [duplicate]

Looking for some help please. We manufacture small off road Land Rover Defenders for holiday parks and the likes. Up until recently these cars have run off 3x 8v lead acid batteries with a ...
Chris Tunstall's user avatar
2 votes
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174 views

Charging an 18650 Li-Ion cell via a bicycle hub dynamo

I'm interested in building a buffer battery for a 12V GPS tracker using a single 18650 Li-Ion cell. It will be mounted on a bicycle and unfortunately I haven't found a design for a tracker including ...
J. Komets's user avatar
2 votes
0 answers
30 views

Certification for Lithium-battery-powered devices

I am designing a device that would use a lithium battery inside, I have read that the battery should be certified with IEC 62133. But my question now is: if I used a certified battery cell(s) in the ...
Ahmed Maher's user avatar
4 votes
2 answers
617 views

How can I safely replace laptop battery pack cells before removing the old cells?

Replacing lithium ion cells in an old laptop battery pack, I want to connect the new cells in parallel before removing the old ones to avoid the BMS locking (if it even would do that). The pack uses ...
Peter Buxton's user avatar
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1 answer
406 views

Can I mix three 18650s with different brands?

I have three 18650 batteries with different brands, but the same voltage and capacity. Can I mix them using a 3s BMS with balancer without a risk?
user330586's user avatar
2 votes
1 answer
3k views

Does a "normal" lithium battery BMS limit the current going into the battery when charging?

If I hook up a 42 V voltage source with an absurd peak amperage to a 42 V battery through a BMS, will it protect the battery from too much current?
Emmanuel Lopez's user avatar
4 votes
1 answer
295 views

Convert AAA battery device to LiPo

I have lots of small (500mAh) LiPo cells taken from Vaping devices (eCigarettes). I want to reuse them in some consumer electronics devices that run off 2 AAA batteries. There is generally space ...
Mark Robinson's user avatar
1 vote
2 answers
1k views

Is taping a safe and effective way of connecting lithium ion batteries?

I am in the process of changing the battery cells in my laptop battery pack and have to somehow connect lithium ion cells. I unfortunately do not own a spot welder and buying/making one for this ...
iohn's user avatar
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4 votes
1 answer
386 views

Is it feasible for an amateur to bring to market a product with a lithium battery?

I'm a hobbyist/amateur who has been successfully selling a USB MIDI device for several years, and I'd like to make a new battery-powered version. It would ideally have a small (150 mAH) li-poly or ...
Andrew Mowry's user avatar
46 votes
5 answers
66k views

Wouldn't charging a lithium battery to 80% only defeat the purpose of putting the battery into longer use in the first place?

I see most smart devices (laptops/tablets/phones) now have the option to optimize your battery by charging it to 80% only. But wouldn't this reduce your capacity i.e. your brand new battery now only ...
GuitlyofNtAsking's user avatar
0 votes
1 answer
96 views

How to control current to charge batteries?

I have an Arduino project that is powered with a 1s battery pack (multiple 18650 in parallel). I use following module to protect against overcharge/overdischarge : https://aliexpress.com/item/...
Musa's user avatar
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0 answers
115 views

LiFePo4 Battery management system

I am creating a 2Ah 3 cell LiFePo4 battery using individual lifepo4 batteries, for a project that requires solar charging from a genasun mppt controller. Considering the battery is split into 3 cells, ...
Moocow22's user avatar
0 votes
1 answer
174 views

LIthium 18650 discharge voltage

I am capacity testing 18650 batteries from old laptops using constant current, previously I used 2.8V as discharge/cutoff voltage but now raised the value to 3.0V Discharge current is 1Amp. I know ...
asim's user avatar
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0 votes
1 answer
1k views

When do I have to worry about shorting? (Coin cell battery assembly)

At work I assemble coin cell batteries (lithium metal) inside a glovebox. I'm a bit confused as to when I do and do not have to worry about shorting. For example, say I'm making this battery: Cathode: ...
hawruh's user avatar
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0 votes
2 answers
146 views

Which battery will be good for gas/water metering - lithium thionyl chloride or lithium manganese dioxide?

We are working on gas/water meters. We are currently using lithium thionyl chloride batteries for our device. After reading some technical documents we found that the lithium manganese dioxide ...
vinayak potadar's user avatar
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0 answers
60 views

Lithium battery - understanding health, current capacity and expected lifespan

Short Question : I've got a Tadiran TL-5104 battery - data sheet HERE I've tested the battery with a multimeter at room temp (c. 20 °C) and got the following readings : 3.57 V, 0.85 mA From the above ...
user27511's user avatar
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0 votes
1 answer
2k views

Recharging CR2032 (LiMnO2) battery in a pinch

My digital calipers take a 3V 2032 (coin cell) battery, they currently contain a CR2032 (lithium manganese dioxide). It's on the very low end of remaining charge, I have no spares, and no easy way to ...
Jason C's user avatar
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0 answers
252 views

If I connect three different capacity lithium batteries in series with a 3S BMS board, When the BMS will stop giving output?

If three different capacity batteries are connected in series with a 3S BMS board, when the lowest capacity battery runs out and under voltage occurs of the battery then will the BMS continue giving ...
Walid's user avatar
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0 votes
1 answer
574 views

Can I parallel two TP4056s to charge 1 cell?

I have a 3600 mAh Li-ion battery and I want charge it at 2 A. I want to use a TP4056 module but its output current is 1 A max. So I decided to use 2 modules in parallel like I drew in the picture. Is ...
yoosefheidari's user avatar
0 votes
1 answer
443 views

48V Lithium Battery Cutoff Detection Circuit

I'm building a power system using four x 48 V 100 Ah lithium batteries in parallel (48 V 400 Ah nominal). The batteries are already purchased, there is no going back. The cells cannot be accessed, ...
VanGogh66's user avatar
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1 vote
1 answer
70 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
Josh Girgis's user avatar
0 votes
1 answer
37 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?
Minx's user avatar
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0 votes
1 answer
2k views

I have two lithium battery packs with separate BMS, Can I connect the packs in Parallel?

I have two lithium battery packs with separate BMS, Can I connect the packs in parallel, will the BMS get damaged or will something happen? 12v 10ah battery pack, I have three in total and each has it'...
Minx's user avatar
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0 answers
28 views

Can I connect a smart charger to a lithium battery with a BMS

I have several tools with NiCad batteries which are failing due to the age of the batteries. I refuse to throw these perfectly good tools away and wish to convert the batteries to lithium. I HAVE ...
J Carbo's user avatar
1 vote
1 answer
478 views

Reverse voltage protection for lithium battery charging module with smd component(s)

I want to add to this famous single cell lithium ion battery charging module a reverse voltage protection: I ended up with the following circuit (Load draws up to 700mA): Updated: My question(s): ...
playmobox's user avatar
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1 vote
0 answers
49 views

Determining charging voltage under load

I'm building a backup system for some computer hardware which is roughly a constant 20W of power at ~48V. I've built a 13S5P Li-Ion pack from the following cells. I'm experimenting with different ...
fullyjosh's user avatar
4 votes
2 answers
1k views

Reverse charge protection for parallel primary lithium cells (CR2450)

First time poster, long time follower here. I am looking into the safety aspect of using primary lithium cells in parallel. The reason behind using parallel cells is to increase overall capacity. In ...
zombie365's user avatar
2 votes
1 answer
235 views

LiFepo4 RV battery bank, charge from beefy alternator setup

What I've got 5x, 200Ah LiFepo4 batteries in a 12V, parallel bank. I'm looking at putting in a Sinister Diesel ...
xanadont's user avatar
3 votes
1 answer
140 views

Replacing Dallas NVRAM with larger capacity variant?

This DS1225AB-200 (8k x 8 = 64kB NVSRAM) is from 1995 and is probably dead (cannot measure from the outside.) The only close replacement in stock is a DS1230AB-100 (32k x 8 = 256kB.) Looking at the ...
rdtsc's user avatar
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0 votes
2 answers
1k views

Is it possible to disable a TP4056 lithium battery charge IC when no battery is present?

I have a circuit that's setup to use either USB or a 3.7V lithium battery. When both are plugged in at the same time, the battery is charged through a TP4056 IC. The charger also has two LEDs attached ...
user2145184's user avatar
2 votes
0 answers
368 views

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 ...
Ramsom's user avatar
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1 vote
2 answers
285 views

DC Step-up Boost Voltage regulator (High Ampere)

I’m working on a project, where I want to go from 5 Lithium-ion cells in series, to 5 Lithium-ion cells in parallel, for versatility purposes i.e. in time, I want to be able to change the output ...
Mat's user avatar
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1 vote
1 answer
815 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 ...
Bogdan's user avatar
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0 answers
96 views

Parallel BMSs with LiFePO4 Packs

I'm trying to design a BMS that allows for multiple larger packs to be connected together in parallel (say, multiple 4S LiFePO4 packs). Using an unconnected conventional BMS SOC there's obviously the ...
Alex Turner's user avatar
1 vote
0 answers
641 views

Lithium Ion Battery Charge & Discharge via Shared Input & Output Lead

I'm seeking to rebuild a few ancient NiCad & NiMh batteries for some vintage laptops I'm fond of, and in the process would like to convert them to Li-Ion. I'll be placing the lithium cells behind ...
Sutekh's user avatar
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