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Questions tagged [batteries]

An electric battery is a device consisting of one or more electrochemical cells that convert stored chemical energy into electrical energy

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57 views

Possibilities for 24v Solar charging of 12v batteries in series and parallel with different Ah capacities

I have two 12 volt 200Ah lead acid batteries and two 12 volt 150 Ah lead-acid batteries. I have a 24 volt 50 Amp charge controller connected to a 150 watt PV panel (overkill for now, but ready for ...
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1answer
101 views

Lithium thionyl chloride for GSM application

I'm trying o use a LiSoCl2 battery in a low power GSM application. When the system is in standby only the microcontroller(MSP430) is powered(3.3v) and the GSM(5v) and sensor(5v) is turned off. The ...
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1answer
73 views

Power source project

I’m currently a computer engineering student from lorma colleges and we’re currently doing our design project. Our project is called an advance helmet. A helmet that is capable on creating a ...
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0answers
55 views

Ultra low power battery

I am currently in the middle of a project and I am quite unsure of what type of battery and battery charger I should be using. To be honest I have never worked with battery or battery charger yet. In ...
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0answers
40 views

Powering multiple Laser Diodes

Hi I am working on a project that has 6 laser diodes. each pair has different voltage requirements. They are 7V-10V, 3V-5V, and 3V-5V. any suggestions to how I could power each together with one board?...
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1answer
99 views

Minimum current for charging a battery

Recently I bought a 12V 200Ah battery for my solar system with 500W 18v (27A) solar panels. I find a label on the battery which is notice that the minimum charging current is 10% of the battery ...
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1answer
88 views

Can multiple microinverters, connected in parallel to a single source, become unstable?

Just to get this out of the way, I realize that what I'm exploring is well outside the design specs for the hardware I'm using. Now that that's out of the way: I have a large lithium battery module ...
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1answer
67 views

Crude Li-Po Battery Charging. Is it safe?

So I have this drone and I want to play with it but there are no chargers for it nor are there cables for this kind of li-po here but I have minimal knowledge with electronics, just enough to make ...
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33 views

Help adding a battery charger

hey there I designing a RFID locking system that i will be running off 12v battery and i have the base circuit built but i would like to add in a system to charge the battery thought the usb port. ...
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0answers
57 views

Connect backup battery pack with BMS HX-3S-01

I want to connect a LiPo 11.1V battery pack with HX-3S-01 BMS board to my circuit. I found some other boards with separate power input and and output. But this one has only one (Charge/Discharge P+-)....
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32 views

Mosfet Selection

I am designing Battery balance system for 16 series Lion(NCR18650) battery pack.I have decided to implement passive balance method.Battery cell voltages will be controlled by MCU and whenever a ...
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1answer
35 views

Battery wiring for DIY speaker question

could anyone tell me if i can wire the 12V battery to get around 20V out of the whole set? Right now it's wired in parallel which increases capacity but i need around 20V for the amplifier to have ...
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1answer
44 views

What is 'DOC' in terms for Depth of Discharge for SLA batteries?

I'm trying to understand the spec of a SLA battery. There's a chart which is titled "Cycle Life in Relation to Depth of Discharge": Can I ask what 'DOC' stands for and the chart is read? How come ...
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2answers
100 views

Is it bad practice to connect wires of vastly different gauges?

I would like to connect an Anderson plug with 25mm² cable to a 12V AGM battery so that I can easily connect and disconnect different devices which will conduct currents of varying amperage. I may ...
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1answer
24 views

Directly Using a Smart Charger with An Old Vector Hunting Spotlight? [closed]

I have an old hunting spotlight (http://documents.dewalt.com/documents/English/Instruction%20Manual/Vector/VEC184POB.pdf) which has a small 12V sealed lead-acid battery. The chargers that come with ...
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1answer
61 views

How to measure battery capacity?

I hope this is not off topic. Consider I buy brand new 12V battery. Normally, will be 13.8V when it fully charged. According to the info written in the cover, it capacity is 42Ah. After used for ...
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46 views

600V buck converter starting circuit

I'm trying to design a control circuit for the following problem. After pressing a mechanical switch, a 24V battery kickstarts my circuit that triggers the high voltage system by toggling the HV ...
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0answers
59 views

Can I extrapolate battery power by a brief observation?

Part of the research we are conducting requires us to estimate how detrimental our proposed algorithm to the battery life of the wearables. To do so, I opted to simply charge the wearable to 100% and ...
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0answers
19 views

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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0answers
23 views

Responsible Battery Reserve Capacity and Low voltage?

It's been asked here, but looking for clarity. How bad is it to undervoltage a 12-volt lead-acid battery? SLI automotive starter batteries list RC (reserve capacity), but I think this a usable ...
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2answers
97 views

Noob question: blinking leds with pn2222A and 9v battery

I'm kind of new here. I've been roaming around the forum for a while trying to figure out how to finish up this circuit I'm building and really need some help. I'm trying to build a blinking LED ...
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3answers
487 views

How can we understand portable battery for mobile phones having 10000 mAh capacity, and 6200 mAh “nameplate capacity”? [closed]

In USA, I always see portable batteries for mobile phone stating they have 5000 mAh, 10000 mAh, or 13000 mAh, etc. (One of the popular one is Anker as on Amazon.com). However, in Asia, I saw the ...
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0answers
28 views

Which power source/elements are better for a spot welder?

I'm going to build a spot welder for the batteries of my RC models, but started thinking which power source is the better choise: 12V car battery with higher start current (500A+) Transformer which ...
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0answers
60 views

Charge a 12V marine/boat battery with AC

need to build a diode bridge to recharge a battery (car/boat type) from a boat engine that gives 12V AC. I thought of doing something like this: simulate this circuit – Schematic created using ...
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2answers
97 views

1N4001 diode in series with battery

I have a door bell that uses 2 AA batteries. I want to use a 18650 — would it work in such an application? It was recommended to use a 18650 in series with a Si diode, such as a 1N4001? The 0....
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1answer
78 views

Determine a suitable replacement battery cell for an obsolete product?

A friend of a friend of mine has a prosthetic knee that was developed in 2010 which requires battery packs that are being phased out. He has asked me if there is a way to replace the internal ...
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3answers
52 views

How is the fuse amp rating determined for a 12V AGM battery bank?

I would like to put 3 x 130Ah AGM batteries in parallel and attach a fuse to the positive terminal of each battery. What size fuse should I use? How is the amp rating of the fuse determined? The ...
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1answer
70 views

How can a 12V 80Ah Battery be 1800W? Shouldn't it be 960W?

How can a 12V 80Ah Battery be 1800W? Shouldn't it be 960W? I was looking for 12V 80Ah Deep Cycle Batteries on Amazon and most of them were 1800W. Like this one: https://www.amazon.com/Cycle-Battery-...
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1answer
87 views

At which amperage will 2 x 100A fuses mounted onto a dual fuse holder blow?

My question is related to a 300A rated dual fuse holder of the following type which is to attach to the positive terminal of an AGM battery: If 2 x 100A fuses were to be mounted onto this fuse holder,...
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1answer
59 views

Supercapacitor for Wind Energy

I am building this wind turbine project and the problem I am facing is the irregular winds that does not keep the inverters running continuously. I initially decided to solve this problem by employing ...
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1answer
89 views

Circuit drawing more current on PCB [closed]

I have a circuit that I developed on breadboard. I have then soldered it on a PCB and it is now drawing more current on PCB compared to when it was on breadboard. I only want to discuss possible ...
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1answer
68 views

Nichrome wire no heat

No heat from nichrome wire. I have tried various experiments on YouTube regarding foam cutters using nichrome wire or steel wire with 9V batteries with an on/off switch or no on/off switch. When the ...
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1answer
77 views

How many 1.5V batteries can I charge simultaneously in series?

I'm wondering if there is a limit in terms of how many batteries can I can charge simultaneously ? I would like to charge 30 batteries at the same time, they will all be in series. Will it work ?
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2answers
64 views

How does the different types of fast charge affect a lithium battery on a cellphone in terms of heat?

I know that fast charge technology allow chargers to communicate with the battery management chip inside the mobile phone in order to use different voltages to charge the mobile phone instead of just ...
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2answers
110 views

Need a solution: Why does the battery voltage drop for custom PCB?

I have a custom PCB to control a solenoid or DC motor. Input voltage 6-7 volts with 4 batteries in series. I have a few questions: Why does the voltage drop by 1V to 1.5V when the switch is pressed ...
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2answers
82 views

Can I use AA Duracell non-rechargeable in parallel?

I have never used non-rechargeable AA Duracell in parallel. I now have an application where I am forced to use batteries. To increase battery capacity I am thinking of connecting AA Duracell in ...
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1answer
70 views

Connecting a super capacitor to the solar battery in parallel

I find some people connect a super capacitor like (16v 88F capacitor bank) in parallel with the 12v 100Ah solar battery to optimize the surge current draws from the battery due to running heavy ...
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2answers
83 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 ...
0
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1answer
37 views

How to read multiple sensors, store into an array, sort and then do something with the results—Arduino

I have a small project that I could use help understanding how best to move forward. I have a set of 8 batteries of different voltages and age. I’d like to read the voltages of all, assign an ...
0
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1answer
198 views

Why can't I use lithium batteries in this multimeter?

I have essentially the same question as this. In that question, it seems lithium batteries are prohibited for use in the device because it wouldn't adequately warn the user that the batteries need to ...
2
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2answers
106 views

Powering a 3 Phase 230VAC Motor with 28 12V Batteries wired in Series

Mechanical Engineering student here. I'm a part of a senior project team that trying to run a 40 HP 230 VAC three phase motor with a 40 HP VFD for a hydraulic pump. Our plan is to wire 28 Lead Acid ...
0
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1answer
36 views

Need help finding an under-voltage protection IC for 2-4 cells [closed]

I've been looking for the last few days but I just can't find one. I've found a ton of single cell protection IC's but I can't find one that does the same for up to 4 cells. A stackable single cell IC ...
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1answer
58 views

How to calculate losses from a DC-DC converter and their effects on battery life

I have a project that requires an odd voltage of 15VDC. The power pack that I plan to build will be two 12VDC 7AH SLA batteries with a DC-DC converter. So I know that my starting conditions will be: ...
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2answers
80 views

How 18650 cells capacity is measured (what are the amperage and cut off voltage params)?

I have lots of used Li-Ion 18650s. I want to test their capacity. There are however 2 important parameters that I cannot find anywhere which is amperage and cut off voltage. Some people use 500mA ...
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0answers
33 views

Stochastique Battery model

This is a very theoretical question. In a electric vehicle the discharge time of the battery depends on the temperature, the driver style and even the road condition. I would like to have a discharge ...
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0answers
27 views

Connecting 2 li-ion battery packs

I have an electric scooter that takes a 60v li-ion battery,can I connect 2 identical batteries together to get longer run time ?
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2answers
49 views

Best way to power a circuit from an unknown number of battery cells?

I'm designing a circuit to monitor the performance of lithium polymer battery cells and am stuck on the best way to power it. The battery packs could have between 2 and 8 cells and are supplied pre-...
0
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1answer
30 views

Battery free TPMS

I am doing a report about wireless TPMS, and I heard about products where the sensors in the valves do not need batteries at all (operate and transmit the data). Is that correct?? have you encountered ...
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2answers
39 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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1answer
48 views

How to determine voltage/amps a circuit board expects

I'd like to add a new power supply to a board that came with 2xAAA batteries wired on. The issue is that the two batteries were connected on opposite ends of the board. I'd like my replacement power ...