Questions tagged [battery-chemistry]

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92 views

Safe Continuous Discharge Rate of a Car Battery

I have a car battery (Varta Silver Line of Products) that's rated at 110Ah, and 900A Cold Cranking Amps. The marketing of the battery from different sources says "huge reserve capacity" but ...
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1answer
61 views

How to calibrate coulomb counter using the open circuit voltage method? (Estimating battery state of charge)

According to u/Krexington_III answer from Reddit, to estimate battery state of charge in a mobile device, such as a cell phone, and do it pretty accurately (and without a need of heavy stuff like a ...
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1answer
55 views

Will the noise level change with battery chemistry? [closed]

I'm using a 48V motor controller and a 48V battery. When I check the 48V terminal with an oscilloscope, it seems noisy. The battery chemistry is LiFePO4. If I use NMC type battery, can I reduce the ...
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1answer
102 views

Recharging CR2032 (LiMnO2) battery in a pinch

My digital calipers take a 3V 2032 (coin cell) battery, they currently contain a CR2032 (lithium manganese dioxide). It's on the very low end of remaining charge, I have no spares, and no easy way to ...
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2answers
140 views

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

I've read Why are(n't) rechargeable batteries damaged by partial charging? and main source quoted batteryuniversity. I found the article having deficiencies and looking to find more "accurate&...
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2answers
86 views

Applying a very low charging current, for an extended period, to a lead acid battery

What would happen should the current to charge a 40 Ah lead acid battery be as low as 750 mA? Would it get charged to its full capacity, say from 12 V to 12.7 V, after a long duration or go ...
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1answer
86 views

12 V, 7 Ah SLA battery reads 0 (zero) volts

I have a new 12 V, 7 Ah battery which reads 0 (zero) vokts. Let me explain the situation. I have a 800W UPS (for pc) whose battery wasn't giving enough backup. So I decided to replace the battery. I ...
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1answer
56 views

Charging Batteries: Estimating SOC using a Voltage look up table

I am charging a battery using constant current. This battery can have voltages from 2.5V to 3.6V. I have characterised the battery, as in found the voltage Vs SOC (state of charge) for the battery. ...
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1answer
102 views

Practical Considerations of using batteries in parallel + parallel Vs series

I have some queries regarding charging/discharging LiFePO4 in parallel: Initially, when they are first connected, they need to be bough to the same voltage to avoid high currents. Excluding the ...
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1answer
44 views

How to estimate Li-ion battery health for an unused smartphone? [closed]

I am considering purchasing a new smartphone that is several years old and could use a little electrical engineering help from the EE geniuses here. I've performed quite a bit of research, and found ...
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2answers
260 views

Nominal voltage of a battery

How is the nominal voltage of a battery determined? A NiMH cell's usable voltage ranges between around 1.4-1.0V and the nominal voltage is quite in the middle of that at 1.2V. Similarly, the nominal ...
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0answers
48 views

Relationship between plating thickness, surface area, and ampere-hours

I am reading a PDF titled Electrochemistry for the Electronics Industry. I am having a hard time understanding the relationship between metals and the Ah (ampere-hour) relationship. For the ...
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1answer
60 views

What will be the steady state Charge distribution of given configuration- battery vs capacitor

I was try to figure it out what should be the charge distribution over the spherical conductor of radius R (in figure below) in following two configurations- Assumptions length of wire (l) connecting ...
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1answer
62 views

Relating Temperature and Battery Performance (HELP)

I am a grade 11 student performing a experiment on relating how external temperature affects the performance of a battery, so its voltage and current change. I've done so much research and cant find a ...
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7answers
3k views

A battery is not connected to anything. Is there a voltage between its plus and minus poles?

Here's one mental picture of a battery: The electro-chemical reactions inside the battery happen only when there's a closed circuit. When you place a voltmeter across the poles, then you create a ...
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3answers
62 views

Protecting components from catastrophic age-related battery failure

As someone who does a lot of restoration work on old electronic devices of all kinds, finding old, leaking batteries well beyond their use-by date is common. Finding that the battery leak has ...
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2answers
172 views

Electrons flow in Li-ion Battery

I’m new to electricity, and I’ve got a question about electrons flow inside a Li-on battery. A lot of articles and videos show us only Li+ ion flows from anode to cathode through electrolyte during ...
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5answers
577 views

Battery life calculation - depending voltage levels

I wonder calculation of the battery life, depends of its voltage level. Basic calculation of battery life is given below: Battery Life = Battery Capacity in mAh / Load Current in mAh However in this ...
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0answers
35 views

Refillable battery chemistry

Is there a refillable battery chemistry, where the electrodes are unmodified by the discharge, and when the electrolyte is spent, you just empty it out, and refill with fresh electrolyte? To me it ...
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1answer
96 views

Practical Basics of Charging a Battery

I see that this question has been asked many times, but I just wanted to get a better overview, rather than asking about another individual situation. When selecting a battery charger, what ratings ...
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1answer
164 views

Protection and charging circuit for LIR2032 or ML2032 battery

I am designing a tiny device with very low power consumption. The device needs a rechargeable battery which should be charged from USB. I have found LIR2032 and ML2032 batteries that can provide ...
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1answer
75 views

What type of battery is best to keep in a seldom used flashlight? [closed]

I'd like to keep a flashlight by my bed for home safety. I intend to only use it in emergencies. Since it's for a home safety emergency, I want to keep the battery stored in the flashlight so it's ...
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1answer
68 views

Will it harm my 9v rechargeable battery if the +ve and -ve terminals are connected to each other [duplicate]

By mistake, the positive and negative terminal of a 9v rechargeable battery were connected to each other by me, and when I noticed it, I quickly removed it and the battery became hot a little. Did it ...
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1answer
56 views

What chemistry are lithium-ion AA rechargeable batteries using? [duplicate]

Recently I've seen rechargeable lithium-ion AA's for sale, but I sure don't want ICR in my pocket or anywhere else near me, and they are 1.5VDC as needed for standard AA, which means something ...
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1answer
76 views

What reaction would take place on an electrode in a lead-acid secondary cell if it were charged and the other electrode removed?

I'm reading a book that covers the basics of electrical theory and I'm at a chapter that discusses the concept of a secondary cell. The author includes the redox reactions that take place in a primary ...
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2answers
307 views

Mixing NiMH and Li-Ion

I have a toy that works with 3 AA Batteries in series. I switched to NiMH batteries but my voltage is less now. Do you think that the middle Battery in the series can be swapped to a 14500 Li-ion? ...
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0answers
39 views

Does Ni-CD battery chemistry lose its discharge amperage over time?

I know with Li-Ion the amperage stays the same, right up until the end of its life, then the Amp Discharge rapidly goes down, But Does a Ni-Cd Battery Chemistry lose its discharge amperage over time? ...
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0answers
60 views

How likely is it for a small Li-ion battery to catch fire on it's own?

Today, I have lost a very small e-cigarette with 260mAh battery probably in an area with a lot of chaff and other flamable stuff, I'm really scared, tried searching everywhere but didn't find it! How ...
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0answers
25 views

How do bluetooth headsets handle 2C charging current?

I have used a few of those bluetooth headsets that are wireless stereo (TWS) ones and are charged by a case in which you insert them. I haven't used expensive ones, just rebranded chinese ones. All of ...
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1answer
66 views

Does a capacitor respond faster than a battery?

I grew up with the rule of thumb that you should always put a 47 uF tantalum capacitor wherever power enters a PCB. Perhaps that's a little dated now. I then recently built a battery powered circuit ...
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3answers
239 views

What did I do wrong - recharging sealed lead-acid battery with recycled computer PSU

Today I took an old computer power supply, stripped the yellow +12v and the black ground, and twisted half of them together each into 4 separate pairs. I then took a lead acid battery, which seemed to ...
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1answer
113 views

What is the longest lasting (number of years or cycles) commercially available battery technology?

I'm asking this question because I felt that an answer would be useful to myself, and anyone else who might design a portable or other battery powered system that is meant to last several decades ...
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1answer
45 views

Which rechargeable battery type for infrequent and low dosage charging

The answer here may be that a rechargeable battery is not the correct solution, and that a battery that is just used and replaced is more suitable but the intended application is: An industrial ...
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0answers
29 views

Enhancement and MPP of a basic Al-air battery with saline electrolyte

I created a simple Al-air battery in oceans using Aluminum and graphite electrodes with ocean water as the electrolyte. There is no electrical separation between the electrodes due to design ...
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0answers
67 views

Battery with high risk of being exposed to fire

I'm currently working on an electronic design which has a high risk of being exposed to temperatures up to 500°C and possibly more. The specifications indicate that once the product is exposed to more ...
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2answers
63 views

Battery questions

I have some questions regarding making a battery pack for a electric bike. I’m looking at the Samsung 50E 21700 5000mAh 9.8A Battery as the base. The max discharge current is 9.8A, if I put two of ...
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1answer
234 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
62 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
139 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
89 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
35 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
4k 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
48 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
58 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
119 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
1k views

Why are lithium-ion 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
1k 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
698 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
114 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
146 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 ...