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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TP5100 for 8.4/4.2V 1S and 2S Lithium Battery Charger Schematic
I am trying to use TP5100 for 2S (3v7 serial 3v7) charging. This is my Schematic, it's basic copy on Typical Application but have a little difference. I'm not sure whether it works or I draw wrong at ...
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Lithium 3S2P, possible faulty BMS?
I have a pool robot that stopped working. Pulled it apart and there's a lithium battery pack with 6 cells. The label states it is 10.8v, so I assume 3S2P.
The pack has a BMS mounted on it. When I ...
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Where does the energy go if a fully loaded lithium battery in an electric vehicle cools down?
If the battery of an electric vehicle was charged to 100% at room temperature the ev has about 100% reach. Now assume the battery is colder and therefore reach drops. What happend to the original ...
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How to Calculate the Exact Timing for CV charging mode in a lithium cell?
We charge our Battery with CC method upto 80%. We got the time for it. Capacity/Ah. Now we switch to CV method for rest of the 20%. How to calculate Time for that Dropping Current?
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BMS 3S (S-8254A) with SJT-150E charger won't fully charge
Lately, i've been trying to use a BMS 3S that is based on the S-8254A IC to charge a group of three cells that I planned on using in series.
To charge the cells , I'm using a 12,6V 10A SJT-150E. This ...
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Dropping Voltage from 1.8 to 1.2 volts
I have a circuit that does not work on Lithium-ion Lithium AA batteries. I wanted to use these to extend the life of my circuit which is electromagnetic pendulum. The voltage of these (e.g. Energizer ...
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Determining Safe C-Rate for Degraded Lithium Batteries: Design vs. Actual Capacity
Which capacity should be used to determine the C-rate for charging and discharging a lithium battery: the design capacity or the actual degraded capacity?
The purpose of this question is to ensure ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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. ...
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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, ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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?
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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?
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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 ...
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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 ...
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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 ...
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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 ...
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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/...
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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, ...
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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 ...
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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: ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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, ...
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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
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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?
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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'...
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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 ...
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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):
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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