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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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35 views

Trying to identify a battery and its controller

Attached are two images of the inside of one of those devices to extend the battery life of your phone. This one was a promotional giveaway and only had their logo on the outside. I tried searching ...
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2answers
48 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
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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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?
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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 ...
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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 ...
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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 ...
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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 ...
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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?
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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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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 ...
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0answers
48 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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
2
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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. ...
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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 ...
1
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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
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 ...
1
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2answers
36 views

Should series connected battery cells have similar internal resistance and to what degree?

I have some Toshiba SCiB cells that I wish to string in 4s configuration. These are Lithium Titanate (LTO) cells. They have a 20Ah capacity and operate safely between 1.5 V and 2.7 V. The cells were ...
1
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1answer
63 views

Lithium Titanate Battery Pack(LTO)

I saw arguably new and interesting lithium battery which is Lithium Titanate Battery(LTO). It has high discharge and charge current characteristic. Also, it has lower degradation graph when comparing ...
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0answers
22 views

check remaining charge of 28V 5Ah Li-ion battery via ESP32

I'm currently doing a project where I have to power some LEDs from a battery remotely. It's done with an ESP32 and the whole system is powered by a 28V 5Ah Li-ion battery. I am using a DCDC-Converter ...
3
votes
1answer
105 views

What would cause my eReader's battery to suddenly start smoking? [closed]

I was listening to some MP3 files on my eReader while shopping at a hardware store, looking at a power generator. I previously checked the battery's percentage and it told me that it was at 80% ...
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1answer
52 views

Servo arduino using eneloop

Say if i use 5x eneloop AA batteries to run 6x MG996R servo, will it be good enough since im afraid for the motor if it will burn out. I already read the spec sheet what im afraid is the stall current
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1answer
27 views

Increasing TPS63001 Under Voltage lockout from 1.8V to 2.5V for use with LiFePO4 cell

The Under Voltage Lockout threshold for this chip ranges from 1.5 V to 1.8 V. I want to use this with a LiFePO4 cell, whose minimum voltage is 2.5 V. With reference to the datasheet here, the VINA ...
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2answers
54 views

Should I add insulation to lithium ion battery

I have purchased a 36v 10ah lithium ion battery for use with an electric bike. I live in rural Australia where it gets very hot in summer and fairly cold in winter. I considered insulating the ...
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0answers
19 views

battery charge controller with small panel

i am designing a battery charge controller with a small panel of 4.5V and 250mA in Arduino UNO. I want that the panel charges the battery(1.2V 3000mAh AA NiMH). i wonder where i place the panel in ...
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1answer
27 views

Thinkpad 420 battery not charging despite of Cells inside are good [closed]

My thinkpad 420 battery is not charging. So far I have done following. Put another battery in my thinkpad and it is charging perfectly. Opened the defective battery and checked all three sets of 2 ...
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0answers
19 views

LoRa network data aggregration at LoRa Gateways

I work on smart water grid project that involves LoRa for data transmission. I have the idea to proposed data aggregation method a LoRa gateways. It's possible? This method will enable to reduce ...
-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.
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3answers
142 views

Why doesn't this battery voltage measurement circuit work? [closed]

So, I built this simple circuit for measuring voltage from a battery pack to an Arduino. The thing is, I want to measure the first cell and then the voltage from the whole battery pack: using two ...
1
vote
1answer
63 views

Can I make endless parallel li-ion connections?

I'm looking into building my own li-ion battery pack. I read about linking the cells in parallel and in series, and how to add a BMS. I would like to build a 12V pack with a very large capacity (mAh)....
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1answer
36 views

Batteries Spike in Watts and Amps Pulled with less than 50% Life

To give a background on this, I have been running tests to determine the actual lifespan of a 3 cell pack of some Samsung 18650s and Tesla 2170s at just above freezing. The Samsungs are INR18650-35E ...
4
votes
1answer
47 views

Preventing overcharge of a SLA battery in a solar electric fence charger

I recently purchased a solar electric fence energizer, specifically the Patriot PS5. After it had been sitting in the sun a while, I noticed the battery was making a "gurgling" noise, which according ...
1
vote
3answers
41 views

Why/How do higher amp hour batteries for tools provide more power?

I have seen power tool brands have battery packs ranging from 1.5Ah to 9Ah. Their advertising indicates that the larger amp hour battery packs can run the tool longer and with more power (such as a ...
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1answer
25 views

how to switch to backup battery when power fail?

I have a project running with MCU supplied with a 24V power supply regulated via an SMPS to 9V also, I have Li-ion battery pack 9V how to connector these two sources to run the MCU with battery pack ...
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0answers
29 views

Usability of a deeply discharged Li-ion batteries

I have a question about Li-ion batteries. About three years back I bought two Sony VTC 5 batteries for my vape. They are rated as 2500 mAh 30 A. But I quit smoking about a year ago and I left these ...
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0answers
49 views

connecting three batteries together

I have a scenario of connecting three batteries together. Two are 12V 80 AH and one is 12V 150AH . All are C20. I wish to make it a 24V system of 150AH by connecting the two 80AHs in parallel which ...
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1answer
27 views

I2C bus stopped working when power was switched to battery

Let me try to describe my schema: There is 12V acid battery constantly charged with DC 13.8v 500ma, on that power (battery) is connected attiny85 thru 78l33 voltage regulator + capacitor 470uf, thru ...