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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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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
20 views

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

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
54 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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1answer
48 views

Switch that lets me run a fan from two different 12v sources [on hold]

I have a 12v fan I plan to wire to my van's battery. Simple enough. But I am thinking I may also want to run it directly from a solar panel sometimes. Is there a toggle or switch designed for this? I ...
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38 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
40 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
18 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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18 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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39 views

battery charging and discharging formula journal link

can anyone give me battery charging and discharging formula journal link? I have been searching for it for a while, but I still can't find the journal that has charging and discharging formula for ...
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2answers
87 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
472 views

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

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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22 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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2answers
38 views

ESP32 with two 18650 batteries [on hold]

I have ESP32s. I want to power the board with two 18650 around 7 volt in total (3.6v * 2 ). Is that possible? Note that I have around 3 sensors. What is the best way to power them? connect the ...
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0answers
27 views

3s lipo battery 11.1 volts for rc planes [closed]

I recently bought a 3s 11.1 volt lipo battery and a charger and a voltage tester, now when i plug the battery to the voltage tester its showing "2cs", and on the balance charger 2nd led is green , 1st ...
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0answers
56 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
91 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
77 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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0answers
25 views

charge/control module [on hold]

I have seen two modules I am considering to charge my cordless tool battery which is ni cads, 18 volt 1.3 amp hour. the two I have seen is the model xh-m603 and the xy-l10a or 30a. both are similar. a ...
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3answers
48 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
66 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
81 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
54 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
88 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
60 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
76 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
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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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0answers
59 views

A brighter window candle? [closed]

Dear Collective Wisdom, I'd like to build a battery-powered candle. I'm considering this bulb: "LED Dimmable Frosted Glass Filament Candelabra Bulb, 4.5W (60W Equiv.) C11 Decorative Milky Candle ...
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2answers
81 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
77 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 ...
0
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1answer
59 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 ...
0
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2answers
59 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 ...
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1answer
36 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 ...
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1answer
161 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
93 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
31 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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0answers
36 views

How to Calculate losses from a DCDC Converter and their effects on battery life

I have a project that requires an odd voltage of 15DCV. The power pack that I plan to build will be two 12DCV 7AH SLA batteries with a DC-DC converter. So I know that my starting conditions will be: ...
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1answer
47 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
26 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
47 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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0answers
61 views

Aluminum-Ion Supercapacitor?

I have recently come up with an idea. I was just wondering if this is hypothetically possible in any way. Is it possible to combine aluminum-ion battery technology with supercapacitor technology? My ...
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2answers
24 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 ...
0
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1answer
46 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 ...
0
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2answers
43 views

Closing 1s battery connector

I have a drone that can plug two 1s batteries. I have the option the plug only one battery but I need to "close" the other battery input with the following (image). I have no idea how this is called. ...
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0answers
38 views

trickle charge backup battery

I would like to know if the schematic below would work to keep a 12V SLA battery at or close to float voltage to be used as a backup battery? R1 will limit the charge current to the battery, but am I ...
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3answers
68 views

Charging 2 12V batteries with a 19V 3.42A laptop charger

I was wondering since the voltage of my laptop charge is too high to charge one battery, it occurred to me if it could be possible to make a parallel or series arrangement to get my 2 12V batteries ...
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1answer
66 views

Do I need to protect every single 18650 battery in a parallel block?

For my project, I will need to connect around twelve 18650 lithium-ion batteries in parallel. Is it necessary to protect every single one of them, or are there any protection circuits that can protect ...
0
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1answer
27 views

Balance charging battery pack one-half at a time?

I'm trying to wrap my head around how I need to go about balancing charging a few NiMh battery packs. I'm using a HiTec x4 charger, which supports balancing charging up to 6 cells at a time. However, ...
0
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1answer
36 views

Powering a 12 Volt Air Pump to a 36 Volt Electric Forklift [closed]

I have a 12 Volt Air Pump (300 W) that I use to inflate products. Normally it is connected to a forklift battery with alligator clips and that's how we power it. We have had people ask how to use ...