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

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37 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. ...
0
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1answer
31 views

Change output voltage of a 9.2V charger to 8.4 [on hold]

I had a head light charger. Its output was 8.4V 1000mA. The charger is not working any more. Now I need a new charger. But light company doesn't sell only the charger. Besides, they are promoting new ...
0
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2answers
24 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 ...
-1
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0answers
21 views

Implementing a charger for 4S li ion cells of 3.2ah each using MAX1640 [on hold]

I am new to the field of electronics and i am intending to develop a charger for 4 li ion cells in series. Each cell is 3.7V and 3.2ah and I need to do this using MAX1640/ MAX1641. I would be grateful ...
0
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2answers
46 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
40 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. ...
3
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1answer
46 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? ...
0
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1answer
41 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: ...
2
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1answer
131 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 ...
0
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1answer
26 views

Using other Lithium based batteries

My question pertains to different types of the Li-ion batteries currently available. ...
0
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1answer
59 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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0answers
29 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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0answers
38 views

Limiting Tablet Battery Charge By Limiting Available Voltage

I have an Android tablet. But I don't use it very often. So sometimes, after a full charge it may not be used for up to a month. And it is bad to store LIPO batteries fully charged. So I want to stop ...
0
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1answer
53 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 ...
0
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1answer
52 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 ...
8
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2answers
479 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: ...
0
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1answer
52 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?
0
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1answer
39 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 ...
0
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0answers
27 views

Effect of the Internal resistance matching for parallel-connected LiFePO4 cells?

I want to design a battery pack with 10 LFP-cells. I want to connect them in parallel (each one has 100Ah). The cells have a different internal resistance. I want to know the effect of the Internal ...
0
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1answer
130 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 ...
7
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1answer
177 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 ...
1
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1answer
43 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 ...
0
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1answer
62 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 ...
0
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1answer
54 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 ...
1
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0answers
33 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
97 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 ...
1
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0answers
28 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) ...
0
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1answer
65 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 ...
0
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1answer
39 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
61 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 ...
3
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2answers
80 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 ...
0
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1answer
44 views

Algoritham to caluculate State of Charge(SOC) & State of Health (SOH) of the LI-Ion Battery?

I am trying to understand the battery management system, but I didn't find any algorithm for columb counting (or) voltage method or any thing else. can you please share this algorithm's if they are ...
0
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1answer
43 views

Lithium Ion battery stopped charging

I have a wireless keyboard that uses rechargeable Lithium-ion battery, the battery is flat and it won't recharge, instead the circuit becomes very hot. I checked the coponents on the circuit for any ...
1
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1answer
87 views

How charge custom Li-ion pack 36v 10s6p

I have 10x 6p 18650 batteries. 13AH. I found a protection circuit. My issue is that I don't know how to charge the batteries. I could use a power source but I got it from my school and it isn't mine. ...
1
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2answers
187 views

protection circuit Lithium-ion batteries

I am designing a lithium-ion battery in my project but I am a little confused in regards to certain aspects of the protection circuit of lithium-ion batteries.I know about the different stages of ...
0
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1answer
63 views

Li-Ion Cell Charger Tips:

I've recently been using an old cell phone charger as a single cell charger to manually charge 18650 li-ion cells. Below is some info about the charger & charging that I have measured. Charger: ...
1
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1answer
78 views

Using balancing charger with Li-Ion protected cells

I'm making a 2S1P battery pack with 18650 elements, each of which is protected. Cells currently can be charged individually as each has a TP4056 board attached to it, that means charging one cell then ...
0
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2answers
205 views

Lithium Ion Cell balancing

I’m making a Lithium Ion charger circuit and successfully used a Texas Instruments bq2057c to charge 2 Lithium Ion cells in parallel (4.2V). Now I want to do the same with the cells in series (8.4V). ...
1
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1answer
60 views

Li-Ion Battery Charging using current controller

For a single Li-Ion battery cell charging process, one needs to do a CCCV cycle, in which first the li ion cell is charged using a constant current (of rating 1C normally), and when a specified ...
1
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2answers
96 views

Estimating the Capacity of Charged Used Li-ion Cells:

I acquired 6 used li-ion cells 1 year ago. Since I wanted to know for certain how well the cells would hold a charge after 1 year, I conducted an experiment. I recently tested the cells. Below is ...
1
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0answers
63 views

What is the ramp rate of a battery used on the grid?

For grid applications, I am looking for typical ramp rate of Li-ion batteries. I am specifically interested in batteries used for frequency management. So suppose I have a 1MW grid connected battery ...
0
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0answers
42 views

How to handle a li-ion battery´s 'charge limited volts' specification without damaging it

I´ve found some useful pieces of information about li-ion batteries in various Q&A but not exactly what I wanted to know (not sure if I understand all of them correctly). I charge a smartphone ...
15
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5answers
3k views

How to solder wires on Li-ion cell phone batteries?

I am making a obstacle avoiding robot and wanted to power it with mobile phone batteries. But wondering how to solder wires on battery correctly for no inconvenience. p.s. I am a new arduino ...
0
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2answers
110 views

How Much Current Is available in Series-Connected Batteries?

If 3 fully charged (3.7V(nom), 2.9Ah) li-ion batteries (rated for 2A max per cell), were placed in series to form a 3S battery pack, how much current could a maximum load draw from the battery without ...
1
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1answer
83 views

Hotplug li-ion in parallel for a custom battery pack

I'm designing a custom battery pack for a computer with 2S1P alignment. However, I want to be able to add batteries on the fly, as the computer is designed to be working at all times without reboots. ...
1
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1answer
183 views

Alternative to lead-acid battery on power wheel toy

This might be a silly question, but here I go. My son’s power wheels car battery (12v 9.5Ah lead acid) is gone and, here in Venezuela, they are pretty difficult to find, not to mention the high ...
0
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2answers
74 views

Charging Li-Ion cells

I have 6 18650 Li-Ion cell from a very old Dell laptop. Unfortunately I could not find any info about them from their markings. They were connected as 3S2P with a total of 11.1V and 4700mAh. ...
1
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1answer
74 views

Charging circuit for a small capacity (13 mAh) li-ion battery

I got my hands on some of Panasonic's new "pin-type" li-ion batteries – the CG-320. However, I have never had to charge a battery with such a low capacity (13 mAh). Are there charge management ICs out ...
0
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0answers
142 views

Battery testing depth of discharge vs cycles

I am currently investigating the relationship between the depth of discharge of a lithium battery, the number of cycles and capacity lost. I know from literature that the lower to DOD (%) the more ...
0
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0answers
61 views

Can't MCP73871 directly power a load?

I'm looking at lady ada's PowerBoost which uses both a MCP73871 and a TPS61090. Why is the TPS61090 needed? Can't the MCP73871 directly power the load? If I'm reading it correctly, the design doesn't ...