Questions tagged [battery-chemistry]

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64 views

Do batteries obey Ohm's law during charging?

A Battery can be modelled as an RC network, which has an impedance. If we take 4.2V L-ion battery with internal resistance of 0.1 ohm, and by applying 4.2 V, at OCV of 3.7V, it will not accept 5A. ...
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3answers
57 views

Failure of a C cell in a 4x battery pack, potential causes?

I am trying to understand failure of cells in battery packs of 4 x alkaline C cells (in series, so ~6V output). The failed cells, from 2 separate battery packs, have bulged and leaked out, you can see ...
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1answer
38 views

Non-rechargeable Battery Gauge circuit / Coulomb counter

I'm trying to find a cheap implementation/circuit to monitor the remaining capacity of a non-rechargeable battery to be specific Lithium thionyl chloride LiSOCI2 batteries. I am aware of TI and Maxim'...
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1answer
34 views

Efficiency of charging a lithium ion battery with a lithium ion battery

Should I need to charge one lithium ion battery with another, what sort of loss would be typical? If I had a 65wh battery, can I calculate how big a battery I need to charge it taking into account ...
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0answers
27 views

Battery Ah specs vs actual Wh when charging and discharging

It is ubiquotously stated that Wh = Ah x V. While this is true (at least regarding the units) I have some doubts about the practical aspects of it. Using an example: Let's take a fully discharged (0%...
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2answers
134 views

What is the battery weight of the Nissan Leaf 62 kWh? [closed]

I found many websites as this one where all details regarding battery packs for 24, 30 and 40 kWh batteries of Nissan Leaf models are stated, while I could not find information regarding the battery ...
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1answer
40 views

Replace UR battery by IMR with lower mAh [closed]

I am replacing a shaver’s battery, a Braun Silk Epil 5. It uses a Li-Ion battery manufactured by Sanyo for Braun. According to my research it must be a UR Battery like the UR18500L : ...
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2answers
52 views

Designing a parallel, rechargeable circuit out of 18650s

as my title says, I would like to design a rechargeable circuit made out of 18650s in parallel. I understand that placing batteries in parallel isn't ideal, so my question is: If I utilize same ...
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1answer
22 views

voltage fluctuation observed in two parallel Li-socl2 battery

Application: our device working is like it wake up 5 times a day wake up period is nearly 30 sec and during this time take measurement from sensor and send data on zigbee and go to sleep.active mode ...
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4answers
108 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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3answers
114 views

Enough Voltage but No current

I have a query. Suppose, I have a battery. Can some battery have enough voltage but not deliver the required current? How is this possible? My question comes from car batteries but it is not ...
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1answer
187 views

Can I keep Li-Ion battery 'charging' continuously at 3.7 V?

I have built a Raspberry Pi NAS and it is powered by a lithium-ion battery through a 5 V step-up module - the one used in powerbanks. The battery is a 18650 Li-Ion battery which is kept continuously ...
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1answer
46 views

Why the spring on (-) polarity at the alkaline battery 1.5v gets eroded

I have small toy and it’s not used for three weeks, later I found out one side of the battery holder at (-) negative polarity spring got eroded. I knew battery gets discharged without using the device ...
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1answer
75 views

Why is there a lead (Pb) warning on extra heavy duty batteries? [closed]

I have some batteries labelled as Extra Heavy Duty with a picture of a trashcan and the letters Pb for lead, and an x over the trashcan which I believe means not to discard in the trash. The batteries ...
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1answer
30 views

Current going into the positive pole of a battery while discharging a capacitor

Please bear with me if this is a fundamental question. Let's suppose we have an RC circuit, charging a capacitor up to the voltage of a battery of 9V. The capacitor is currently at 9V, we switch the ...
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2answers
139 views

laptop batteries charging myths - Long life OR short life

I'm very conscious about the life of battery. Some people say that don't keep plugged-in laptop all over the time and remove battery charging at 70% and again charge at 40% so your battery cells ...
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2answers
151 views

Looking for a explanation/cause of lithium polymer battery failure

I'm hoping that someone on the EE StackExchange could give me some insight into what is going on with some lithium polymer batteries that I have under test. The question I am trying to answer is: ...
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1answer
59 views

How can I make a li-ion charger using logic gates with auto cut-off facilities? [closed]

I'm recently assigned a project to make a battery charger, using logic gates. But I have no idea how to proceed. I'm in need of guidance. I have basic knowledge but not so deep. So I think I can ...
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0answers
68 views

Can a tin layer on a PCB cause battery corrosion?

We have developped a PCB with a battery holder. As you can see the copper is covered by a tin layer. On older versions of our PCB it had a gold-plated layer. Now on our recent boards we experienced ...
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1answer
29 views

Can LiMn02 Lithium Manganese Dioxide batteries like CR123a be used in parallel?

I'd like to use multiple Lithium Manganese Dioxide cells in parallel in increase capacity. Using a single larger cell wouldn't fit the shape requirements for our ID. LiMn02 are a primary cell and don'...
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2answers
55 views

What's the maximum safe discharge current of my sealed lead acid battery?

So I had a sealed lead acid battery which have a characteristics of 4Ah and 6v and 20h. First if all when I searched about discharge rate of this kind of battery I found this "The sealed lead-acid ...
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1answer
538 views

Are lithium ion batteries damaged by strong magnets?

I'm wondering if it is okay to put a lithium ion battery directly next to a strong permanent magnet. Would this affect the functioning of the battery? Can it lead to early failure? In the worst ...
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1answer
92 views

How does the charging curve of a deep-cycle lead-acid battery change as it degrades?

I am designing a circuit inside a UPS that periodically tests how long the battery can power the load. It does this by breifly disconnecting the power from the UPS and extrapolating from the measured ...
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2answers
342 views

Do Duracell AAA batteries have internal short circuit detection?

I was shorting a Duracell AAA battery in a SAFE area with proper precautions. After 2 minutes I disconnected the circuit and measured the voltage, it dropped from 2.8V to 2.6V and the battery was hot. ...
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3answers
44 views

How can you visually model voltage vs. current?

I'm trying to wrap my head around Voltage and Current. I saw this analogy on a post from another site that seems to make sense: For circuits I tend to mentally use a "plumbing" analogy. The voltage ...
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2answers
496 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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1answer
64 views

200AH lead acid battery

I have a 12V 200AH lead acid battery and I want my load be a power resistor and a bulb. Does the batter draw current based on the load resistance? so meaning the current that will be drawn in this ...
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2answers
186 views

Battery operation, charge and discharge processes misconceptions

I'm trying to elaborate a simple explanation (and conceptually correct) of how a battery charges and discharges, and why we say things like "the charge stored in the battery is x Ah". For ...
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0answers
43 views

Li-ion cell voltage balancing issue while charging

I have a two cell li-ion battery which has specifications of 7.4v, 2200mAH. I used one cell (3.7v, 2200mAH) for a required project. I discharged it and then reconfigured in to series(7.4v, 2200mAH) ...
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1answer
55 views

Jumpbox battery [closed]

First time on this site just signed up hopefully I get the answer I'm looking for. I'm working with a Coleman Powermate emergency jump-start box. The battery that was in it is a rechargeable sealed ...
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0answers
83 views

Conflicting information on Qualcomm quick-charge 3.0 standard

Out of many fast charging protocols, Qualcomm quick-charge 1.0/2.0/3.0/4.0/4+ is a prominent one. I tried to find the specification of quick-charge 3.0 protocol. However, the material spread across ...
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4answers
1k views

Allowable reverse current into Alkaline battery

Anyone know what happens to alkaline battery if a small current pumped in? For example 0.5uA into a 9V battery alkaline? I want to add a simple 9V battery + rectifier as backup voltage to a 12v ...
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1answer
141 views

Why are(n't) rechargeable batteries damaged by partial charging?

Over the years, I've come across websites and people with different opinions on the "correct" way to charge rechargeable batteries (I'm more concerned with laptop, tablet and phone batteries than with ...
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1answer
334 views

Battery advice re cooking equipment

Please go gentle as I am a novice at electronics/battery issues. I am hoping someone with a much bigger brain than me can answer this question... Is it realistically possible to power a 1200W ...
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2answers
573 views

Is Non-Passive Cooling bad for Lithium Ion Cells?

I'm in the process of designing a device capable of charging, discharging and testing internal resistance of 18650 cells. My device will be capable of testing 100x 18650 at the same time, each will ...
2
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1answer
382 views

Is it safe to charge single 18650 cells without temperature sensing?

I was looking at 'power bank' circuit boards on Aliexpress, the kind that you add to a 18650 cell to make a basic 5V in/out supply. I noticed they all seemed to be lacking any kind of temperature ...
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0answers
27 views

Deep Discharge of Cells and Batteries

This is a question related to What makes primary batteries leak on very deep discharge? What are the dangers of deep discharging a cell or battery? I've seen a LiPo battery getting puffy most likely ...
2
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1answer
119 views

What are different battery capacity algorithms used? [closed]

I need to implement an algorithm to know the capacity of a battery. I don't want to use any external gauges which are available on the market. Can you suggest which algorithm(s) is/are popular? Can ...
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1answer
189 views

How to calculate capacity of a battery from the readings of current and time?

The requirement is to compute the capacity of the battery in order to calculate the capacity degradation. The input which can be acquired are current, voltage, relative time, battery level (in terms ...
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1answer
44 views

I am working on choosing an ideal anode for salt water battery. [closed]

Can anyone tell me how to justify this anode is the best compared to other? ALso, why the discharge capacity decrease with C rate? what does cyclability and rate capability means?
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1answer
80 views

Do full charges and deep discharges wear the battery because of terminal voltage?

A mobile phone battery charged to indicated 100%, which is not being charged at the moment, might have the same terminal voltage as if it is being charged at 2A while being at an indicated capacity of ...
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3answers
213 views

How to identify, if possible, a battery [closed]

I have these two batteries, 18350 form factor, without any label. As far as I know they are rechargeable because I've salvaged them and put in my salvaged "li-ion to be cecked" box. Now I've ...
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5answers
2k views

9V battery versus 6xAA batteries

I've been following this tutorial on Arduinos, for the ones that are interested it's this one. Yesterday I was struggling to get a servo moving. Sometimes it made small twitchy kind of movements, ...
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1answer
138 views

Why do lead-acid batteries only last for a few years? [closed]

Why do lead-acid (automotive-style) batteries typically only last for a few years of regular use (or x amount of cycles) before having problems? Obviously, things can't last forever. But, what are ...
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1answer
5k views

Difference between Tubular and Tall Tubular Inverter Batteries

What is a difference between Tubular and Tall Tubular Inverter Batteries with same configuartions? Why are Tall Tubular batteries are priced high than Tubular Batteries? Tall battery have warranty ...
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1answer
3k views

battery 'sizzling' noise

car battery making a noise similar to light buzzing ( shorting?) battery just over a year old. car just back from being driven. earth lead removed .noise still there. best described as 'sizzling' ...
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4answers
441 views

What is the recommended battery chemistry for digital multimeters?

I would like to know if the different internal resistances of different battery chemistry somehow affects the calibration of a digital multi-meter. If so, then what would the optimal battery ...
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1answer
189 views

18650 cells - Unable to measure capacity

I got many 18650 batteries from notebook batteries and I want to test their capacity by my Turnigy Accucell 8. My problem is, that when I start discharge program (0.5A what is from battery datasheet) ...
3
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1answer
72 views

Is the carbon-zinc battery that I am characterising overloaded? Using HPPC

I am trying to characterise a 9 V battery using a pulsed load measurement. The battery is a 9 V zinc-carbon eveready super heavy duty. The load is a controllable constant current source. When I ...
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1answer
75 views

How much current should I pass through battery to break through sulphate deposits?

I recovered an aged SLA from the pile dated 2003 marked 6V 4.5AH. It has .97V in it. As I recollect, thumb rule for a charging current would be about 500mA at 7V or better. A breadboarded LM317 may ...