Stack Exchange Network

Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [batteries]

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

0
votes
1answer
97 views

Am I calculating battery life expectancy correctly for this RF receiver?

I have this RF remote/receiver. Though the manual says battery life for the receiver is at least 12 months, I easily get 2 years of operation on a fresh set of batteries. The receiver 4 uses AAA ...
1
vote
2answers
95 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 ...
0
votes
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 ...
0
votes
3answers
2k views

Connecting 5 12V LEDs in a parallel circuit

I recently bought 5 12V ultra bright LEDs (all identical), and want to hook them up to a battery pack of 8 AA batteries. So I figured I could just make five parallel circuits with one LED in each, and ...
1
vote
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 ...
5
votes
1answer
26k views

Charging lithium batteries with solar panels

Let's say I have a battery pack made from 3 lithium-ion cells connected in a series (making a battery with around 12 volts). That battery pack has a PCB with balancing function and also protects the ...
-2
votes
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 ...
0
votes
0answers
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 ...
3
votes
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 ...
0
votes
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, ...
0
votes
0answers
80 views

Increasing the number of parallel cells for batteries

I am using Texas Inst IC for a lithium ion battery which is in the 4Serial-3Parallel cell configuration. In addition, I don't use LED or LCD in this lithium-ion battery. My cells have 3500mAh capacity....
0
votes
1answer
115 views

Clarifications about charging a 9V battery?

I have a project in mind with Arduino but I wanted to use a battery to power all of it. I have to power a Wi-Fi module and a small servo/stepper for a short period of time, maybe a RTC circuit and a ...
1
vote
0answers
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 ...
-2
votes
0answers
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 ...
1
vote
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 ...
4
votes
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 ...
0
votes
0answers
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 ...
0
votes
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 ...
-2
votes
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 ...
1
vote
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 ...
1
vote
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 ...
0
votes
1answer
104 views

Calculating the time it takes for a battery to fully charge

I was looking at the following question: How to Calculate the time of Charging and Discharging of battery? And I was wondering if the voltage takes part in the calculation somehow? For example, I have ...
0
votes
1answer
112 views

Use 36v battery with step up converter for 48v kit

I have an e-bike motor ( bbs02 48v 750watts ) which requires 48v battery. I also have a 36v 13ah ebike battery. Opening the battery and changing cells connection to make it 48 would take lots of ...
0
votes
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....
0
votes
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 ...
1
vote
3answers
115 views

How to connect LED strip to be powered by charger and batteries

I plan on using it mostly plugged in, batteries are there just for extra mobility and won't be used most of the time. Don't know lot about batteries so in first scheme I added a switch (pos. 1 ...
-1
votes
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 ...
0
votes
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 ...
0
votes
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-...
0
votes
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,...
0
votes
3answers
135 views

What is the logic of running a NiMH battery in charge-discharge cycles everyday?

I have an 1500 mAh NiMH battery for powering a 2250 kV motor and four 9g servos for my radio controlled plane. I had bought the battery 8 months back and I had used it to fly my plane which drained ...
0
votes
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 ...
-5
votes
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 ...
0
votes
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 ...
-1
votes
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 ?
1
vote
2answers
60 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 ...
0
votes
2answers
120 views

How to measure output voltage of this Li-Ion battery circuit?

I've designed an AtTiny85 based Lithium-Ion battery protection/boost circuit that monitors the battery voltage and cuts the battery power to the external powered circuit when the battery dips below a ...
0
votes
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 ...
0
votes
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 ...
0
votes
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
votes
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 ...
0
votes
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 ...
2
votes
1answer
110 views

Switch from one battery to another when one is discharged/disconnected?

I'm trying to figure out how to switch source power from one battery to another when one is dead or disconnected. the circuit needs to be able detect the loss of power on the jettisoned battery and ...
2
votes
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
votes
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 ...
6
votes
2answers
3k views

Why do Lithium Ion batteries self discharge?

I've seen some questions about loss of capacity due to internal resistance and oxidation of plates. I've also learned that these batteries have protection circuits. But I'm curious about Self ...
2
votes
2answers
2k views

Charging a 12V battery bank while using it

I have (4) 12V 190 Ah AGM batteries connected in series. I want to run a portable A/C unit through a 2000 watt inverter connected to those batteries and charge the batteries simultaniously with a ...
0
votes
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 ...
0
votes
2answers
6k views

Lithium charge module on NiMh batteries [closed]

Can I use a lithium charge module on NiMh batteries? The charge module has 2 led, one for charging and one for full that I would really like to use with my NiMh batteries.
0
votes
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: ...