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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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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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196 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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74 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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42 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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1answer
68 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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65 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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2k views

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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1answer
134 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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Lion Battery Shutdown Mode and Wake on Charge

I'm currently designing a BMS that doesn't rely on a TI bq-series IC for gas gauging, protections, etc. So far, I have analog circuitry handling over and under-voltage cutoff, overcurrent cutoff, ...
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2answers
113 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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1answer
45 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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2answers
50 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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112 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
603 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 ...
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1answer
49 views

How can I measure the charge current into a small LiPo battery?

I have a SparkFun USB LiPoly charger that by (default) is set at 500mA. If I try and measure the charge current with my DIY multimeters, the charging LED goes out and the meter reports zero current? ...
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1answer
240 views

Protecting a coin cell from high current spikes - using a capacitor or not?

I've built some prototypes and try to gather some data from them. Skip below the two horizontal lines to read more about it. Original Question Brief summary I would like to know whether it is ...
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1answer
33 views

What is the idle current draw of a charge indicator?

What is the most energy efficient charge indicator for a 12v battery? how many mW does it use for every state of charge?
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1answer
123 views

Bad Practice - Charging Lithium Batteries while powering circuit?

I'm using a 2s BMC to charge a 2s2p lithium battery pack (7.4v, ~6Ah). The output of the charging circuit is the same as the input - they're not separate. As a result, when I want to charge the ...
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52 views

How effective is CID and PTC protection on batteries?

There is a source that states: 18650 batteries sold in the US are required to have CID and PTC protection. I've read that CID is just an insulation layer, and PTC is a resettable fuse which ...
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1answer
68 views

Relation between terminal voltage and charging speed in Lithium-Ion/Polymer batteries?

I tested charging a 5200 mAh (20 Wh) battery at 10W. Its charging level at the beginning was 20%. The terminal voltage was 3.68V. Now, I applied 10W of charging rate to the battery. The terminal ...
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2answers
191 views

Understanding constant current/constant voltage charging of LiIon battery

I'm trying to understand exactly how CC/CV charging of a LiIon battery works and I tried to replicate it with a cheap bench power supply (RD Tech DPS3003) and a Samsung INR 18650-25R. The bench power ...
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1answer
36 views

Frequently interrupting the CC charging stage of a Lithium-Polymer battery

Because of design constraints I need to charge a 2S Li-Po battery over its balance connectors using a single-cell charger IC (e.g LTC4002). In order to allow the user to interrupt the charging process ...
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68 views

How to test a lithium battery? [closed]

I ordered some lithium batteries (like this) I'm planning to test the specs like -Maximum Continuous Discharge Current -PCM Discharge Cut-Off Voltage -PCM High Temperature Cut-Off In what other ...
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1answer
137 views

Charging a Li-Ion Battery

I am trying to charge an 850mah 3.7v battery using a TP4056 circuit that will recieve regulated 4.2v at a maximum of 500ma though the current can drop due to it being regulated solar power. What will ...
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122 views

What is the efficiency of a lithium polymer battery?

I noticed that when charging and discharging a lithium polymer battery, the incoming/outcoming energy I calculated is very near to the specifications of the manufacturer. How is that possible if any ...
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1answer
144 views

Li-Po charger booster circuit

I'm trying to design a simple circuit that has the ability to charge a single cell Li-Po battery and can be used as +5v power source. I chose the circuit from here. It seems that when ...
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1answer
106 views

How to measure internal battery pressure?

Which unit is used to measure internal battery pressure? And how can it be measured? (Does it change with battery age somehow?) The internal battery pressure increases at high charging capacities ...
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21 views

Dedicated li-ion step up drivers

I have a design which will include the optional use case of boosting up to 7V from a li-ion battery. I can't seem to find any drivers dedicated to li-ion for this? There seem to be a few buck boost ...
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3answers
260 views

Confused on Lithium-Ion Batteries to Output 5V 4.4A for a Project

I have been looking into Lithium Ion batteries, things such as the 18650 lithium ion battery; however, the details are confusing me. I am attempting to extract 5V 4.4 Amps (Peltier element powered ...
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134 views

Master switch placement for Li-ion charging circuit MCP73871

I am designing my first Li-ion charging circuit, based on the Adafruit Powerboost 1000C, and this is what I have so far: I am probably going to also add a way to read the battery voltage based on ...
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274 views

Li-ion charging circuit

I have a project that I want to power with a single cell lithium ion battery, which is to be charged from a USB plug (but not from a laptop or computer, rather from a wall supply like a phone charger)....
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2answers
228 views

Do Inverters change the lithium-ion batterie's mA capacity and wattage? [closed]

let me say if I have a pack of lithium batteries connected in series and parallels, and i want to connect it to an Inverter, BUT...BEFORE I connect it to inverter, lets say it gives out 12 volts "...
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1answer
96 views

How do current spikes over limit affect Lithium battery life?

In one of my application, I am using Tadiran Lithium Thionyl Chloride Batteries MODEL TL-5934. In the data sheet , the max pulse current shows 50mA. However, in my application, we have low duty cycle ...
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2answers
66 views

Dual power supply for low power circuit

I am struggling to find a solution for the project I am working on. The circuit is powered directly from two 3V lithium batteries connected in parallel. The average power consumption of the circuit ...
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1answer
620 views

DW01 2s protection

I want to protect 2 18650 batteries with single DW01. The problem is how to increase the protection voltage on DW01 . I have read that I should use voltage divider on VCC pin. I just want to make sure ...
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1answer
2k views

What is the maximum static voltage of LiFePo4 batteries?

I've been working with a pack of batteries from a DIY electric vehicle. The batteries in the pack are LiFePo4 chemistry and were chosen for safety (greater resistance to thermal run-away), flat ...
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1answer
153 views

Running a battery in propylene glycol

So I was thinking about building a deep water camera housing. The housing would be filled with a non-conductive fluid to counter the pressure at depth. Although fluids like purified water or ...
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1answer
52 views

Batteries for Drones [closed]

I am making a drone for geological applications and for that we require a flight time of 1.5 hr without payload. Could anyone recommend any battery types of alternate power sources that I could use?
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0answers
62 views

Designing Battery Power System For Robotics

I'm building a mobile robotics project for a class and I'm trying to figure out how to (or even if its necessary) to design a nice battery power system for it. I sort of wanted to learn how to build a ...
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3answers
113 views

What are my prototyping options when working with smt devices?

I have been working on a project which will allow me to learn how to charge Li-ion batteries. I recently purchased some simple PMIC's made by Texas Instruments. I received them the other day and ...
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3answers
779 views

How to determine lithium battery versus the internal battery cells

I have a Lithium Ion Polymer battery (EEMB LP963450) and I am trying to determine how many cells are in it, and something is not making sense with my math. Here's the formula I am using: Determine ...
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1answer
95 views

Power supply circuit concerns

TL;DR: Go to the bulleted list below. As a weekend project I tried to design a simple power supply (without sofisticated switching mode ICs, since they are very hard to find where I live). So after ...
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1answer
804 views

Charging a 5 cell 18v lithium battery with single charger?

I want to charge a 18v cordless drill lithium battery, which is basically 5 Panasonic INR18650-20R 3.7v cells connected in series. the battery pins are BATTERY+, BATTERY- and 4 pins marked BATTERY1, ...
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0answers
38 views

How to protect electrical parts from heating coil

I'm trying to diy an electric lighter with a 3.7v lithium battery, an on\off switch, and a micro lipo usb charger. Already connected the coil and everything works as expected. The only problem I ...
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2answers
736 views

Buck/boost to charge lithium battery from solar and alternator?

I have a 105Ah 12V Pb battery in my 4x4 for the fridge, it is charged by solar panel or the car's alternator through a DC-DC charger connected to both. The charger is however only for Pb batts and I ...
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1answer
73 views

laptop battery care [closed]

Many people keep their laptops plugged in and charging when using them at home, and rarely if ever take them out of the home. This keeps the Lithium battery at 100% State Of Charge (SOC), which I ...
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1answer
49 views

Replacing 10 AAA NiMH 1.2A batteries with 6, 9v Lithium 1.2A batteries

A vacuum that ran on 10 AAA NiMH batteries in series (15.6v at 1.2A) is nearly dead. I attempted to replace with 6, EBL 9v 1.2A batteries Lithium... bought off a the internet. I connected them such ...
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5answers
4k views

Why are lithium ion cells mostly round?

After watching some tear-down videos on YouTube with various lithium battery products (portable chargers, laptop battery, power tools) they all (apart from mobile phones / tablet battery) seem to ...
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1answer
78 views

Solar power charging problems

Is it possible to power a 12v power board with a lithium battery, while keeping it charged via a solar panel. Or would I need to have two batteries and somehow automatically change them over when the ...
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1answer
146 views

Switch off this single cell lithium hi-power LED driver with protection circuit

I've been goofing around the internet trying to build my own flash light with a single 18650, with low voltage protection circuit. For now this circuit can already achieve following ideas: Standby ...