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

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Safely managing charge of 4s27p configuration

I have qty 108 brand new CJ (brand) FST 18650 2000 mah cells (3.6V nominal, 2.9V min). The goal is a peak 600W charge & discharge pack with 800 Whr. The topology will be 4s (14.4V). Each cell ...
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45 views

How deleterious is topping-off my Li-ion batteries (phone/laptop) every time they drop to 90%?

I have read recently that frequent top-off charging of my personal electronics is hard on the batteries. Specifically, Li-ion batteries in recent model smart phones and laptops will show significant ...
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2answers
38 views

Why MCP73871 lithium battery charger IC takes so long?

I'm working on a Microchip IC: MCP73871, a very small linear charger for lithium-based batteries. It has very nifty feature: a load-sharing system that gives priority to the load over the battery in ...
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1answer
33 views

Understanding Li-ion Battery(ICR18650-26H)

I trying to use a Li-ion Battery in my project. ICR18650-26H is suitable for my project(GPS data logger) I think. I am having hard time understanding one particular parameter in the specification ...
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3answers
52 views

Looking an IC chip to charge cell phone [duplicate]

I have a DC voltage source (between 5 and 10V) from which I want to charge cell phone with a USB cable. I believe that using a LM317 or similar IC for charging cell phones is not a good idea as most ...
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46 views

5 volt small UPS design (review request)

I'm designing small 5 volts UPS that would allow me to run on battery or 5V source. If source is unavailable, step-up module takes power from battery. If this 5V source is restored, then this source ...
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0answers
34 views

How to connect capacitors to SIM800C gsm module [duplicate]

I am powering a SIM800C from a 3.7V Li-ion battery. If the battery charge drop below 85% (it still has 4.1V measured without load), the module keeps restarting during startup. This probably happens ...
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1answer
25 views

Re-attaching Tablet Lithium Ion Battery With DC Power Pigtails

Complete electrical newbie here. Please forgive my ignorance. I have a tablet that gets "circuit locked" or something. It refuses to detect the charged battery. It seems to charge the battery, but ...
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2answers
79 views

Should you plug your device in more frequently and wear out the MicroUSB port, or let the Li-Ion battery drain more and wear out the cells? [closed]

I would like to know what advice to give the consumer about how often they should charge the device. I read in this answer (and various other places on the net) that MicroUSB ports are rated for ...
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0answers
44 views

Lithium Polymer battery puff sensing

I have an IoT application which requires > 20,000 mAh of battery capacity. This can either come from a single cell or a number of cells connected in parallel. The device is going to remain unattended ...
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0answers
47 views

Transzorb for MCP73831 USB LiIon Charger?

The datasheet of MCP73831 (a small LiIon charger device) recommends a transzorb on the USB power input (VDD) for input over voltage protection. See Section 6.1.1.2. Absolute maximum ratings for VDD ...
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97 views

How many battery cells in a smartphone?

Are most batteries built into smartphones (e.g. iPhone) single cell batteries? If so, why might that be?
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1answer
40 views

Peltier and Portable Litium Ion Battery [closed]

I am designing a portable rechargeable heat flask using peltier module at what specifications I should choose my power supply?? I am actually going for rechargeable lithium Ion battery with 12 volt ...
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1answer
64 views

Why do Lithium Ion batteries self discharge?

I've seen some questions about loss of capacity due to internal resistance and oxidation of plates. I've also learned that these batteries have protection circuits. But I'm curious about Self ...
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1answer
123 views

TP4056 Lithium Charger Module issue

Im having an issue with TP4056 Lithium Charger Module. Connected the battery 3.7v 150mah battery. When charging the red led is on but it never shuts off and no charge state is reached even after 1-2h ...
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1answer
32 views

Separating lithium ion cells for charging

I have a large set of circuits to make using Lithium Ion cells for power. The circuit requires ~12V, which is easily achieved by stacking three cells in series, but the charging circuits I've ...
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2answers
66 views

What is the valid capacity ranges of Lithium Ion 18650 batteries?

I'm seeing wildly varying capacities that are seemingly fake on 18650 cells, such as these "9,800 mAh" ones on eBay, but are ~$1 / cell. However, 'genuine' cells from Panasonic and similar name ...
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2answers
127 views

How to connect old 18650 different capacity cells as a 2S2P pack?

recently I've opened up a laptop battery pack and got 6 18650 cells and 2 of them were 0V and other 4 had 3.75V. so i fully charged them with a Imax b6 charger and discharged them at 1.0A to 3V and ...
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1answer
57 views

Discharge Characteristics of Lithium Ion Battery

I am doing a simple experiment to analyse the discharge characteristics of a Lithium Ion battery to see how long it takes to discharge. I have a 12V 4000mAh battery. Once charged, using a voltmeter I ...
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3answers
499 views

Is draining a Li-Ion to 2.5v harmful to the battery?

I am running one of my projects from two 2000mAh Lithium Ion batteries wired in parallel I decided to let the battery run until it died, just once, to see how long it would last. It lasted 25.9 ...
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1answer
50 views

What's going to be more efficient, buck from series or boost from parallel?

I've found many similar questions, and hate to ask something so similar, but my goal is to get usb power (4A continuous) from 4 18650 Li-Ion cells. I'm debating putting them in parallel and using a ...
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4answers
567 views

Running 3.3V MCU from LIR2032 Lithium-ion button cell

Background I wish to power my circuit with a Lithium-ion battery LIR2032 (around 40 mAh capacity). These batteries have a voltage that goes from 4.2V to 3V typically during their discharge cycle. My ...
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3answers
55 views

power micro controller with 7.4V 400mah battery

I want o control a servo with a micro controller and I need more torque so I chose a 7.4V battery. Power my micro controller requires only 3.3V and obvious if I try to power it straight from this ...
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2answers
69 views

optimal mAH 18650 cell required for laptop

Good day I will be replacing my laptop batteries with 18650's, however my question is as follows. Stats : Battery pack = 6 cell (18650 type Li-ion battery) Time : +/- 3-5 Hours if memory serves. ...
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2answers
51 views

Get Li-Ion battery capacity from discharge time (constant load)

I would like to ask if there is some easy enough way to calculate Li-Ion battery capacity if I measure the discharge time with constant load (not constant current!). I have made a "discharger" using ...
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2answers
59 views

Replace Li-Ion battery with buck converter?

I have a remote control for a GoPro camera. The remote runs off a 3.7 v li-ion battery. The remote draws about 100 mA. I want to extend its usability by supplying 12 v power. The camera cable takes ...
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2answers
72 views

Li-ion swappable 18650 in parallel - preventing mixing charged&discharged cells

I'm designing a device that has 6 18650 elements (all parallel) in holders, made so that the end user will be able to pop out the batteries when they're discharged and plug in a set of new batteries. ...
4
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1answer
116 views

li-ion balancing with zener diodes

Would there be any potential problems with the below implementation of a rudimentary li-ion balancing/(overcharge protection) circuit? Would a resistor need to be in series with the zeners? ...
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1answer
58 views

How to calculate how much current can lithium battery provide?

I need to know how much current can produce battery below? And how to increse current and voltage with 2 batteries like this below? Here are some details: ...
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1answer
173 views

Questions about Li-ion battery charger and battery monitor chips

I want to build a system powered by 14.8v Li-po battery pack or mains power (selectable power path). When the mains adapter is connected, the battery will be charged and the system will be powered ...
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1answer
30 views

Using other Lithium based batteries

My question pertains to different types of the Li-ion batteries currently available. ...
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1answer
124 views

Is it possible to use a MOSFET for Li-ion reverse polarity protection when protecting a charger?

I've made a simple charger out of 4 TP4056 modules and 4 18650 sockets. These modules have overcharge, undercharge and overcurrent protection included, but I also want to know how simple it would be ...
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44 views

Balancing lithium iron phosphate / Charge in parallel and discharge in series

I'm trying to make my current project charge with a more convenient barrel connector charger. This also means I want to keep the charger as small as possible. So the packs are wired in parallel to ...
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1answer
85 views

4s2p lithium ion battery charging from USB

I am newby in electronics. I planning to design a 4s2p (3.7 V, 3000mAh) li-ion battery pack and a charger. I want to use TI BQ series (BQ24618) ICs for charging. I know we can charge battery pack ...
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1answer
98 views

Overcharge Lithium-Ion when using charge controller + Arduino Load

I'm trying to determine if I need to rethink my circuit for a solar + Li-Ion powered Arduino. Basically a solar powered module with 3.7V Li-Ion backup for night / clouds (to be charged during the ...
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2answers
552 views

How plausible is the claim about a 200 kW battery solution?

Following this question posted on Aviation:SE: Does the ARCA hoverboard violate known limits on small-diameter electric fans? which is related to a hovering board described on the vendor site: ...
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1answer
53 views

Two voltage regulators on same circuit

Would it work if I have a lithium ion battery that's connected to a voltage regulator that's connect to a Raspberry PI then another voltage regulator to a display?
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1answer
70 views

Paralel charging two Lithium Polymer batteries on a MP3 player Colorfly C4

Is it a good idea to replace a built in lithium polymer battery rated: 3.7 V, 2000 mah with TWO x brand new 3.7 V, 1800 mah ...
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1answer
134 views

Selecting a battery for a DIY project

I am building myself a laptop (for fun, I know it doesn't make economical sense ;) ). I have now come to the problem of implementing a lithium battery for it. It will have to power the SBC and the ...
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1answer
193 views

Is it possible to test a lithium ion battery for safety? How?

There have been stories in the news recently about fires that are believed to be caused by the lithium-ion batteries inside hoverboards. If you had one of these devices and didn't mind taking the ...
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1answer
66 views

Li-Ion pulse discharge to improve output characteristics

There are many scientific studies done on pulse charging of Lithium-Ion batteries. However, I have found nearly none on pulse-discharging those. Here is probably one of the few-ones. This study ...
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1answer
93 views

Can I charge a 3.7v Lion with a 4.2v Lipoly charger?

I have some 3.7v (when fully charged) lion batteries that I would like to repurpose. All I have to charge these is a few chargers for some 4.2v lipo (when fully charged) batteries. The specific ...
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1answer
63 views

Efficient and quick charging and discharging of a 2.7V supercapacitor with a 4.2V Li-ion battery

I have a 2.7V 50F* capacitor and a 4.2V high-power Li-ion slave battery. Based on an ideal circuit that only has the internal battery resistance of approximately 1 m \omega\$ , the RC time constant ...
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0answers
50 views

Pow Management IC: Li-Ion 2.8 - 4.2V; Sys Volts: 3.3V

I am designing a consumer Li-ion powered system with the following constraints: The system volts has to be 3.3V Li-Ion battery charging range is 2.8 - 4.2V Charging is to be done via a standard USB ...
0
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1answer
217 views

li-ion pack charging with buck boost xl6009

I'd like some feedback on implementing a CC CV 3s li-ion (laptop) battery pack charger using a 12V supply and a XL6009 switched regulator. I want to use a current sensing module to sends it's analog ...
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48 views

Combining coulomb counting and OCV measurement for SOC estimation

For estimating the SOC of Li-Ion cell, one can use a number of methods available. But coulomb counting is one of the mostly used methods so far. Another simple technique Open Circuit Voltage (OCV) ...
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1answer
117 views

Measuring Li-Ion Battery voltage during charging/discharging

I am supposed to measure a Li-Ion Battery cell's energy efficiency. For this purpose i have built up the apparatus setup which charges and discharges the battery cell to calculate its energy. One ...
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1answer
91 views

Energy efficiency of Li-Ion Battery

My question is that does the energy efficiency for Li-Ion battery varies for different C rates ? For e.g if a battery is charged and discharged at a lower C rate, would it's energy efficiency would be ...
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2answers
68 views

Li-po - li-ion chargers

I have bought a Li-po charger the other day and I looked up the IC and it stated Li-ion. Can you charge a Li-po with a Li-ion IC? And the other way around? The IC I am talking about is the TP4056. I ...
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2answers
132 views

When to read Battery voltage and battery current during charging

I am using a micro-controller to drive a buck converter for Li-ion battery charging purpose(Micro-controller providing PWM to the buck converter). During charging the battery's current and voltage ...