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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

0
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2answers
121 views

9V Battery Current Range

What is the range of currents that I can safely draw out of a 9V battery without damaging it? I am planning to design an experiment and I don't want to draw too much of current out of a battery and ...
-1
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2answers
80 views

Will a resistor allow the battery to last longer?

3V 25mAh button cell battery, a single 3-3.4v 20mA UV LED. If I put a 1/8W 1 ohm resistor in the circuit will the battery last longer?
-2
votes
2answers
45 views

Calculate run time for leds

I have 8, 5 watt LEDs that run from a 12VDC source. 3, 18650 batteries at 3000mAh each. I want to know the approx run time of the LEDs. Thanks.
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0answers
28 views

Trying to identify a battery and its controller

Attached are two images of the inside of one of those device batteries to extend use of your phone. This one was a promotional giveaway and only had their logo on the outside. I tried searching for ...
-1
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0answers
38 views

Charging a 12v12ah battery [on hold]

Does this look ok to you? I'm trying to charge a 12v12ah with a 12v battery charger
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1answer
487 views

Supercapacitor or battery with capacitor

Maybe the question that I ask is completely dumb because I am a complete noob in this, but please help. So first off, my question is that if I want to charge a 2.7v 500F supercapacitor, can I charge ...
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votes
1answer
50 views

Super Capacitor battery replacement, Lead Acid vs Capacitor explosion

I'm considering replacing my lead acid starting batteries on my boat with something like this. 500F @ 16v Starting battery module https://www.maxwell.com/images/documents/ESM_Manual_Install_4_15.pdf ...
0
votes
1answer
99 views

Can a house battery share common ground with the starter battery without interference?

I am quite new at this so bear with my questions. I have purchased two 12 volt batteries which I will connect in series for 24 volt and to be used as house batteries. I drive a truck which has a 24 ...
0
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2answers
37 views

Calculate battery life when using boost converter

How should I calculate the time taken to drain the battery to below 5 V when using a boost converter to convert DC 18 V to 28 V for a load on 20 mA. Battery used is 2 x 9 V, 210 mAh. The converter ...
-1
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0answers
40 views

Replacing a NiCD 12V battery pack with NiMH

Never mind. I dismantled the original battery pack and the third lead is just another 12v Sensor.
-9
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0answers
39 views

Does solar pannel develop current [on hold]

I would like to know weather solar pannels and battery generate current the same way. I am trying to replace the solar array with a battery bank will it fry the inverter electronics.The inverter ...
0
votes
1answer
228 views

PMIC Battery charger and power path

I was looking for a PMIC with battery charger and built-in power path when I came across one of TI's new chip. BQ25601 http://www.ti.com/product/BQ25601. while I was trying its performance and doing ...
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2answers
61 views

Can I connect 10 AWG wire carrying up to 25 amps to 10 parallel 1 ohm 10 watt resistors?

I am trying to measure the charge capacity of some LTO battery cells. To do this I want to discharge each battery cell from 2.5 V to 1.7 V. I am going to measure and log the current over the discharge ...
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0answers
21 views

Using a single battery for robot motors and electronics

Instead of using two separate 12V SLA batteries (one for motor controllers*, one for Arduino, LEDs, sensors ...), would they work in series as one 24V battery, with a step-down converter for each ...
1
vote
1answer
4k views

Arduino and GSM Module running on Li-primary batteries for years

For one of our projects we need to run an Arduino board + GSM module (SIM800C for example) for many years on batteries without recharging. The Arduino should be in power down mode for 99,99% of the ...
0
votes
1answer
25 views

protection board for 18650, voltage drop? normal?

I made a power pack using 18650 batteries from an old laptop. All batteries tested individually are good. 4 batteries in 2S format. I used a cheap 2S 3Amp rated protection board I got on Ebay from ...
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3answers
46 views

Battery systems for 440v industrial motors

Are there systems utilizing batteries to start large (25hp - 50hp) 440v 3-phase electric motors, thereby eliminating spikes to the supply grid?
1
vote
1answer
140 views

4s battery pack, how to build?

I have 8 cells (samsung icr18650-26f), and I want to build a battery pack 4s 14.8v (4x3.7v) to power an LCD Controller Board that requires a 12v4amp input I have an idea of the design of this battery ...
0
votes
1answer
39 views

Replacement battery voltage mismatch tolerance?

I want to try replacing a proprietary battery in an electronic of mine as a first electronics DIY project. Thing is, the stock battery is 3.6V, and the phone battery I have on hand that I would like ...
-3
votes
1answer
64 views

Reduce 12.8 volts DC to 3.0 DC [closed]

I would like to reduce the voltage of a SLA battery from 12.8 VDC to 3.0 VDC. How would I do that?
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votes
3answers
61 views

Battery required for a portable immersion boiler

Immersion heaters like the one pictured are typically plugged in. I'm interested in potentially developing one that is battery operated so it can be used on backcountry camping trips. A water heating ...
0
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0answers
47 views

12 battery with stepper to 30 or 30v battery [on hold]

I have 2, 50w COB LED they work 1.5A@30v I'm thinking to go solar with them but i have a dilemma. Should i invest in 12v batteries and panels and step up the voltage to 30v and have some waste or ...
0
votes
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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0answers
32 views

How will the batteries of new phones manufacturered two years ago, and bought now be? [closed]

We are thinking to buy Samsung Note 8; it seems to have been launched 1.5 years ago. In reddit, a user said: "Samsung still sells the phone? BTW, lithium ion batteries degrade whether they are used or ...
0
votes
1answer
13 views

CSB batteries Constant Current Discharge Characteristics

I'm comparing batteries for use in UPSes and during my tests I was consulting the datasheets of 2 manufacturers. The datasheet from SunLight is crystal clear but CSB's datasheet is using terminology ...
2
votes
0answers
70 views

Lithium battery performance in cold temperatures powering BLE Beacon

I am working on a project that requires the use of BLE Beacons in very low-temperature environments, on average -15°C but on occasion as low as -25°C. We are currently trialling a brand of BLE Beacon ...
21
votes
6answers
260k views

How to Calculate the time of Charging and Discharging of battery?

How do I calculate the approximated time for the Charging and Discharging of the battery? Is there any equation available for the purpose? If yes, then please provide me.
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votes
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 ...
1
vote
0answers
37 views

help building 6S2P balanced Li-Ion battery pack

I'm trying to build a 6S2P balanced Li-Ion battery pack for a quadcopter using LG 18650 HG2 cells with pre-soldered nickel strips (1st image) so that I won't solder directly on the cell's terminals. ...
0
votes
0answers
26 views

Overvoltage Protection for Battery Charger

I'm trying to come up with some form of precise overvoltage protection between battery chargers and batteries between 12V and 48V batteries. I have 12 and 24 sorted using different methods: crowbar ...
0
votes
1answer
60 views

Does wiring 18650 batteries in parallel and/or series increase the discharge rate of the whole pack?

I cannot seem to find a solid conclusive answer anywhere on this, but if I build a pack of 6 18650 batteries in parallel which are 3500 mAh each, that would make the pack 21 Ah in total. Then I take ...
1
vote
2answers
103 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 now, I have ...
1
vote
3answers
707 views

How to measure 6S LIPO battery juice in percentage from Raspberry Pi?

I've got a Raspberry Pi and I want to use it to measure the percentage of charge which a 6S LIPO battery pack has left which I then send to a server over the internet. I assumed there would be easy ...
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2answers
224 views

How to choose the resistors for UC3906

I would like to build a battery charger with my UC3906 IC. I found a lot of data-sheets, application note, etc. but nothing that comprehensively explain how to choose the values of the resistors. I ...
2
votes
1answer
627 views

Proper way to recover 18650 cells from laptop batteries

I'm looking for a tutorial on how to recover 18650 cells from laptop battery packs. Like what should I do, and what should I not do, how to test them to see their condition. The way I'm doing it now ...
-1
votes
0answers
13 views

Continous Battery Discharge rate ? Vruzend Kit?

Hello im working on a project and I've calculated all the power requirements and found it to be 12V and 15Ah, so while looking for a battery I've came across Vruzend DIY kit which seems really ...
0
votes
1answer
110 views

Inductor and Capacitor for Bidirectional DC-DC Converter with Battery

I have to design a bidirectional converter to regulate a DC bus at 250 V with a battery bank at 144 V. My question is how to do it optimally, because I do not know the maximum ripple allowed in the ...
-1
votes
0answers
24 views

Single IC for charging and boosting LiPo battery [closed]

I'm designing a power management system for a bio-signal acquisition system (low-noise amplifier, ADC, uC, Bluetooth). I will power the system using a LiPo battery such as this. (3.7V, 500mA, 1050mAh, ...
1
vote
2answers
57 views

How to protect Li-Ion battery from a defibrillator pulse

I'm working on a design where the rechargeable Li-Ion battery is placed closely (attached with a magnetic connector) to a body-worn contact. The concern is that in an event of a defibrillation, the ...
1
vote
1answer
341 views

TP4056 and Lipo batteries

I have several 3.7V 1800mah and 700mah Lipo batteries that also have the 8205A MOSFET and DW01a chips mounted to the top. I've seen the two types of TP4056 boards (one with these two chips for lipo ...
2
votes
1answer
1k views

Batteries connection to load and charging port for DIY bluetooth speaker

it is my first question here, so I hope to write this in the right way. What I'm trying to accomplish is buidling a battery powered bluetooth speaker. In order to do it I'm using the following parts: ...
0
votes
0answers
38 views

Strange issue with phone replacement battery [closed]

I've recently bought a replacement battery for my OnePlus 3T on Amazon. At first I thought it was fine. It turned on, showed a decent battery percentage and could use the phone with it. However, with ...
0
votes
1answer
52 views

I need someone to help me power 37 colour changing LEDs [on hold]

I'm new to programing and led works, and I've started off with a bit of an ambitious project, I'm making a large cape, that is meant to light up. 37 colour changing LEDs (no data line, they are solo ...
1
vote
0answers
30 views

Protecting Copper Anode in 12V DC System

Getting to grips with cathodic protection here. If someone had a 12, 24 or 48VDC system, say solar PV and batteries, and the battery negative is earthed, this means the earth is the cathode, and the ...
0
votes
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 ...
0
votes
1answer
37 views

ESP8266 circuit with an LED

I'm building a project where I use an ESP8266 module to control a LED with my smartphone. For my project I want to battery power the ESP8266 and the LED so I'm using two Lithium Ion batteries. I've ...
0
votes
1answer
56 views

How to detect low RTC battery with low extra battery load?

I want to detect low battery in typical DS1307 circuit with microcontroller. My first idea is to connect one of low cost comparator inputs to Vbat, another input to 2.0V from some voltage divider ...
1
vote
1answer
60 views

How do I efficiently implement a simple voltage divider for battery level readings?

I'm trying to design a simple device based on ESP32 board, which will control stepper motors from a battery pack (26650 series). I'm struggling with the battery level control part (red/blue colour ...
0
votes
1answer
15 views

Running MG996R servo using Eneloop Pros

Recently I just bought 2 pack of Eneloop pros, and have fully charged it. By using a multimeter I saw that the voltage went up to 1.3 ish after it is fully charged. And I'm planning on using 5 of them ...
3
votes
0answers
134 views

Parallel connection of old and new gel batteries [closed]

I have a battery system shown in the picture, 6 parallel branches of 4 batteries connected in series. The first 3 consist of old batteries which are 2 years old, the fourth branch consists of 1.5-...