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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13 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 ...
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24 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): Sorry, updated: My ...
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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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46 views

Charging Li ion pack 6S/10P [closed]

I want make Li-ion pack, (6s/10p), this is the li-ion cell type: sony_us18650vtc6 Also I am using BMS from Litech (https://www.litechpower.com/product-detail/HCX-D596V1LI06S70A_01.html) All cells same ...
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34 views

Voltage setup for lighting rig (mobile)

I'm trying to build a mobile rig with a series of powerful lights (LEDs, Infrared, UV). My question is concerning the nominal voltage requirements of my project. Some of the lights I want to use, due ...
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36 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 ...
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1answer
104 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 ...
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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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72 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 ...
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60 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 ...
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228 views

How to charge a 4S 18650 (16.8V) battery pack with a 5V USB input source?

I'm planning on building a 4s 18650 (16.8V) lithium-ion battery pack with a 4s BMS with balance function to replace an old built-in Ni-Mh battpack. I would like to charge the new lithium battpack via ...
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59 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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80 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 ...
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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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26 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 ...
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63 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 ...
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78 views

Question about mixing battery sizes and quantities

Ok. I have searched everywhere and can't find a definite answer on this: My first question, Is, Can you mix 2 lithium batteries of different sizes together? (Like mixing an 18650 lithium battery with ...
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57 views

Can I use a lithium charger for a bluetooth speaker with a NiMH battery? [closed]

I have a BlueAnt bt blast bluetooth speaker that I need a new charger for. It says DC 12V on the back by the power supply. I checked the manual and this speaker has a NiMH rechargeable battery. Can I ...
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45 views

Can we estimate the remaining lifespan of a Lithium (Iron Phosphate) battery by its energy efficiency?

All manufacturers that publish the energy efficiency of their lithium (iron phosphate) battery claims that it's 99%. https://www.sciencedirect.com/ claims that: Lithium Battery - an overview | ...
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4answers
125 views

Why are lithium batteries stored at 50% voltage and not a lower voltage?

I understand that a higher voltage causes more degradation of the material in the cell, but I'm curious as to why the typical storage voltage is not lower than 50%. I've always assumed that the lower ...
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131 views

Fuse detection in a lithium Battery Parallel connection

I really need your help in order to figure out a solution to detect a blow fuse in a 16S parallel connection. The issue is: Despite a fuse has been blow the voltage at the other side of the fuse is ...
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79 views

How to determine the practical constant current rate of charging phase of a Lithium battery?

As discussed earlier, terminal voltages would never exceed the CV value (4.2V for Li-Ion cell) while charging: If that's the case, the CC value should be the current value at the time the terminal ...
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132 views

BMS and Charger For LiFePO4 prismatic module

I just purchased a lithium battery module for an electric tractor project. I'm looking for advice on how to set up my BMS and charger. Here are the details of the module from the seller: "Prismatic ...
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705 views

Would floating a Lithium battery indefinitely at a lower voltage than max voltage cause any harm?

As a rule of thumb, charging should be terminated when the charging current drops to 0.1C at constant voltage phase of lithium battery charging. Membranes would have over stressed otherwise, which ...
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164 views

How to drop 5v regular phone charger voltage to 3.7v to run a device, which use 3.7v output battery before

I have Motorola Moto 360 2st edition smartwatch and watch original battery is dead. I have converted smartwatch into table watch in DIY wooden block and added 18650 3.7v battery instead and now its ...
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80 views

Which XT60 on battery?

What is the recommended plug on the battery? The male or the female XT60 and why? XT60 connector
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152 views

Lithium battery charger and balancer circuit (or IC)

I am working on a project which sould charge and balance 4 to 6 (maybe 8 in future) serial connected lithium cell batteries (~4000 mAh capacity) with about 4A of charge current. First I looked for IC ...
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79 views

IATA battery rules

Following IATA guidelines two threshold limits are indicated: 20Wh for cells and 100Wh for multi-cell batteries. Question: Should I apply 20Wh limit also for cells in multi-cell batteries? Example: ...
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76 views

Do li-po batteries need esd protection?

I bought some li-po batteries and they were in antistatic bags. They have protection circuits. Do they need esd protection (grey bags)?
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597 views

What is the charger voltage graph while charging Lithium battery with CC/CV approach?

What is the voltage graph from the point of view of the charger while performing a CC/CV charging? Isn't a "Dedicated Lithium Ion CC/CV charger" simply "a Constant Voltage DC Source with Current ...
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1answer
76 views

Effect of Rapid Switching between Charge/Discharge of Lithium Batteries

I have made a DIY offgrid solar generator that utilizes an arduino to determine when to dump excess energy to a water heating load. I have programmed the arduino to activate the load circuit when the ...
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285 views

Can lithium batteries and lead acid batteries be used together? [closed]

If I have the two batteries with same voltage but different capacity, can lithium batteries (the lfp battery like this type) and lead-acid batteries be used together?
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470 views

What is the effect on lithium ion batteries from long term storage in sub-freezing temperatures?

I am designing an off-grid power system for a mountain cabin that is not used in the winter. The ambient temperature can get as low as -20deg F (-29deg C) during the winter. Due to snow and other ...
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203 views

How to safely test a Lithium Battery Management System board

I'd like to design a Battery Managements System board (based on TI bq40z50-R2) for my own small (2-4s) lithium battery pack, but I am still unsure how can I test it safely. I am worried that an error ...
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481 views

Lithium 72V (2x 36V series) charging with double 36V charger for ebike project [closed]

Edit1: Voltage is wrong but here is a basic wiring diagram for a parallel to series changeover switch I found on internet closest to what I want. I want to 2 36v battery packs in series. I know that ...
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89 views

How bad are 3 degrees Celsius for a lithium battery and electronics?

I have a PCB powered by a lithium battery , it works well inside the house, but when I leave it exposed to low temperatures with humidity the PCB or the battery stops working. I leave the PCB in the ...
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67 views

Li battery charger reference voltage problem

schematic datasheet I have designed a battery charging circuit for a lithium ion battery.When i connect a battery the charging IC seems to do nothing. Only when i use a multimeter probe to measure ...
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693 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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2k views

Lithium Titanate Battery Pack(LTO)

I saw arguably new and interesting lithium battery which is Lithium Titanate Battery(LTO). It has high discharge and charge current characteristic. Also, it has lower degradation graph when comparing ...
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919 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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94 views

Multiple dc-dc Converters mid-tap on batteries connected in series

I want to design a 48v system for an RV with multiple Lithium batteries connected in series (either four 12v or two 24v lithium batteries). I like the idea of a 48v system to reduce the size of the ...
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620 views

Measure battery pack cell voltages with analog multiplexer and instrumentational amplifier

I'd like to measure the voltages of individual lithium based cells (LiPo, LiIon, LiFePO4) in a battery pack (up to 4 cells in series), using an ADC. I was thinking about the following approach, using ...
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266 views

Drop 0.7V using a diode for use of a lithium battery with a 3V mouse?

I plan to use a rechargeable lithium 3.7V battery in my wireless mouse, which takes 2 AAAs. As I understand it, I could theoretically drop 0.7V using a diode in series with the mouse, but would it be ...
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If a lithium cell is said to have a capacity of 20 Ah, does that mean all 20 Ah can be used?

Toshiba's SCiB 20 Ah Lithium titanate cell is said to have a nominal capacity of 20 Ah. The cutoff voltages are 1.5 V and 2.7 V. Does this mean that all 20 Ah of charge exist between those two cutoff ...
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560 views

What is the typical RMS noise of a lithium battery?

Take a typical CR2032 battery, if it is not discharging, what is the typical variation in voltage over a short period of time (eg a few seconds or minutes)?
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507 views

What is the effective equivalent battery capacity between Lithium Ion and Sealed Lead Acid batteries? [closed]

I was told by a battery salesperson that a Lithium Ion 100Ah battery is equivalent to a 260Ah lead acid battery bank. Is this correct? I understand that lead acid batteries should only be discharged ...
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60 views

E-bike battery needs custom charge voltage, but how?

I thought I'd give my old e-bike an upgrade, and I've build a 8S4P battery with charge controller (BMS). The thing is the electronics of the ebike quite working @ 31.5 V - a fully charged 8S battery ...
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195 views

Substitute 12v Lead Acid Battery with Nominal 10.8v Lithium Ion Battery?

I am looking to replace an existing 12v Lead Acid battery configuration (two 7.5Ah batteries in parallel) for an old practice tennis ball machine. The machine consists of 12v dc motors and sensors to ...
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1k views

How to charge two 18650s in series without a middle connection?

I have a battery pack of 2 18650 cells in series, so it is possible for me to charge it without connecting anything to the central 3.7v potential point as many answers mention? The battery in question ...
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1answer
2k views

Mixing Lead acid and Lithium ion in series, after charging them separately

Can I connect a Lithium ion battery battery pack with a Lead acid battery bank; in series. I will charge both separately cells strings separately (not to mix the chemistries) before putting them in ...