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Questions tagged [battery-operated]

Involving or pertaining to a circuit or device that is intended to be operated with cells or batteries (as opposed to mains power, for example).

3
votes
1answer
70 views

Boost converter with battery issues

I have a battery application. With an 11.1 V battery input, I need to maintain a 12 V, 2 A output as the battery discharges. I bought a 1500 mAh, 11.1 V LiPo battery pack with a 35 C rating and I ...
1
vote
2answers
48 views

DC Motor PWM Circuit Implementation

I'm a little new to this, so bear with me: I am working on a hobby-related project that involves the operation of two DC motors in parallel, powered by a NiMH battery. (Crappy circuit diagram ...
-5
votes
1answer
85 views

Battery capacity calculation/method [closed]

While calculating battery power capacity requirement for a circuit consisting of multiple loads having different power consumption, how should one proceed to avoid any error? How it is done in ...
0
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0answers
41 views

Does replacing Li-ion accumulator with a pair of good quality AAA NiMH makes light shoes safer?

I bought my daughter a pair of light shoes (LED). Fortunately they broke down after 2 days and she's not wearing them anymore. After buying I realised that they probably have Li-ion accu inside. So I ...
-1
votes
1answer
52 views

Battery Run-time/capacity calculation

Problem is to find the difference in run-time between: a. Using 12V 10Ah battery vs 24V 5Ah battery. PS: Load is rated at 12VDC and 24V to 12V step-down conversion is available.
0
votes
1answer
77 views

Convert something that runs off two D cell batteries to instead run off a car battery

I do not know much, but I have a portable shower (http://help.venditiogroup.com/support/solutions/articles/6000178636-zenvida-portable-tankless-water-heater-outdoor-shower-260-pcwh01) that I would ...
2
votes
0answers
51 views

What is the reason for high frequency noise when amplifier is powered with battery?

Hi I made a small headphone amp and powered it using lipo battery.voltage is stepped up to 5v.everything is working with direct supply (ie., while charging battery)but as soon as I unplug the charger ,...
0
votes
3answers
81 views

How do I get 5V 10A output from a 3.7V li-ion battery for 64x16 led matrix display module?

Please I am new to electronics and new here. I'm doing a project which involves the use of a 18650 li-ion battery (or two as may be the case) to power a 64x16 led matrix display module which (...
0
votes
1answer
35 views

What is the best battery configuration for a solar powered electric fence setup?

I have two solar panels: SunWize SW-85P; 85W max power, 5.1A, 16.7V. I have a charge controller: SOLAR BOOST 2000E. I have four 12V batteries: two Interstate SRM-24 (couple years old), two CarQuest ...
1
vote
2answers
67 views

make LED 12v light fixtures

I would like to remove the n27 sockets from household light fixtures and replace them with LED lights used in the automotive industry. I would like to put a reasonable amount of LEDs in the fixture to ...
2
votes
2answers
44 views

How to size a battery for a starter motor?

I am trying to size a battery for a starter motor for a 120cc 2-stroke engine. The starter is listed as 12V/250W (so 20A draw). The engine manufacturer offers a 3000mAh NIMH battery (so like ~30A max ...
0
votes
0answers
41 views

How to calculate drain capacity of battery?

I have a 200Ah 12v battery. We are designing an auto guided vehicle which will cover a maximum distance of 80-90 meters. To drive the motor we will be using a bldc controller and Brushless DC ...
0
votes
2answers
59 views

Hovercraft not moving at all [closed]

I'm a beginner in electronics. I tried making a hovercraft that looks like this: The bottom looks like this: And the battery used is this: I have used a 9v motor, a 9v battery and a dual blade ...
0
votes
0answers
37 views

battery life estimation for a RF relay

For now I'm using this RF relay with a 12V DC adapter but I'm thinking to power it with a battery. The remote control of the relay already uses a 12V battery. My assumption is that the receiver ...
1
vote
1answer
39 views

Calculate battery duration [duplicate]

Maybe this is a trivial question, but I am struggling with it for a while. I have an alkaline AA battery which is consuming 80mA for 8 seconds each 30 minutes. I need to calculate how many days it ...
0
votes
0answers
37 views

battery backup switching

I am working on an appliance project in which I have been tasked with the design of the power supply. The project specifications hold that from a 230v 50Hz wall supply two voltage rails of 5v (for ...
0
votes
3answers
195 views

Is everything OK with this circuit?

Coming from this question, I decided to have some changes. So my case is I have an LED with this description: Dimensions (diameter x height): 20 x 8 mm Operating voltage: 3,4-3,6 V Rated current: 700 ...
0
votes
3answers
92 views

Can I replace a battery with a source of the same voltage but different capacity (mAh)?

I have a device that has a bad battery and I am trying to find a suitable replacement. There are no replacement batteries for the device so I am trying to put something together myself. The original ...
1
vote
0answers
72 views

Uninterrupted power supply with auto shutdown lead Acid Battery

Bellow circuit is an uninterrupted power supply(4.7 Vout after regulator) with auto shutdown when the battery is low. I am using a 6-volt lead acid battery with 9v charger. I am looking for an Idea ...
0
votes
0answers
38 views

external phone parallel battery

I’m trying to find a way to place a 5000 mAh battery outside of the iPhone 5s case, and perhaps altogether removing the internal one if needed. The battery outside is taken from an external battery ...
0
votes
1answer
94 views

Lead acid battery charging current dosent become zero

Here I am charging a 6V 4.5Ah lead acid battery by using a 8V-10V LM317 input supply for the circuit. I'm using the BD139 transistor to cut off and a 6.8V zener diode. As the battery voltage reaches ...
0
votes
2answers
44 views

SLA battery constantly being charged and used

I have a 12V 7Ah SLA battery with a smart battery charger for SLA batteries with the maximal output of 0.8A. I would like to use the battery to charge an Arduino board with few other things (at most ...
0
votes
2answers
82 views

How can I power mobile devices from my 36v or 48v battery safely? [closed]

I want to buy a rear rack battery for my bike, but not for powering the bike. Instead, I want to power other things, such as an action camera+gimbal, a mobile phone charger, grip warmers, lights etc ...
0
votes
0answers
52 views

What is the actual proper way to integrate a balancing charger into a multi-series li-ion pack?

What I want to do is build a pack that in order to charge and use it all you have to do is plug in a wall wart (the way commercial products like laptops, phones, E-skateboards, etc. I have scoured ...
1
vote
3answers
108 views

How to find out which end of a dead battery is the anode, and its voltage [closed]

The battery pack for an old rc car I played with as a kid, has died. Salt crystals everywhere, smells like vinegar. The pack consists of 8 batteries of AA-size connected in series. The red markers ...
0
votes
1answer
85 views

Which DC-DC converter for a uController

I want to power a uC project (uC is a STM32, supposed to be powered with 3.3V) over a LiPo battery. Since LiPo's output ranges from 4.2 volts to 3.7 volts, I feel unsure whether to use a step-down or ...
-1
votes
1answer
60 views

9v battery voltage goes down very low when connected, but shoots back up when it is disconnected?

Whenever I leave a 9v battery connected to my circuit (simple circuit connected to a motion sensor) It goes down to about 3.3v, but when I disconnect it again, it will slowly go back up to about 8v. ...
1
vote
1answer
119 views

Excessive voltage drop from LiPo battery

I am using a 750mAh 25C 3.7v LiPo battery for a custom electronics project which currently draws ~1.5 amps, far below the rated operating current of (0.75 * 25 = ) 18.75 amps. However, at the battery ...
0
votes
0answers
16 views

Dedicated li-ion step up drivers

I have a design which will include the optional use case of boosting up to 7V from a li-ion battery. I can't seem to find any drivers dedicated to li-ion for this? There seem to be a few buck boost ...
0
votes
1answer
128 views

Lithium ion battery protection IC not able to drive MOSFET

I have integrated the TP4056 charger design into my PCB, The problem is that when i connect the battery at the battery terminals, i could not able to get the voltage at its output pins, the circuit ...
0
votes
3answers
278 views

Running 12V PC Fan with 9V Battery

i got an old PC fan which according to its label runs at 12V drawing 0.14Amps. I would like to run this with a 9V Battery so that it doesnt go too fast. Does this make sense? How long would the fan ...
2
votes
2answers
73 views

Solar powered water pump - need some advice

I am completely new to elecrical engineering, but I want to give it a shot and am really interested in learning more details about how all of it works. I've had an advanced physics course in high ...
1
vote
2answers
127 views

Why is it recommended to not use a device while charging? How does it harm the battery or the device?

I was planning on getting the new VR headset from Oculus, dubbed Oculus GO. The battery life of that thing is roughly 3 hours max. So, during long VR sessions, powering the headset via a power bank ...
0
votes
3answers
66 views

Will battery last longer with larger capacity but lower efficiency (high V through LDO) or vice versa?

Given a simple circuit of a draw around 28mA (when supplied 3.3v). I'm trying to maximize run time on a battery, but working with what I've got on hand... I have the following batteries: 5000mAh 3S ...
1
vote
2answers
87 views

Is it safe to connect a small solar panel to a lead acid with only a diode?

Is my setup safe? I'm connecting two 7.2v 100ma solar panels in parallel using two 1N5817 then to a to 6v lead acid battery with a Constant Voltage Charge of 7.3-7.4v for cycle use.I can't use a MPPT ...
0
votes
2answers
69 views

Safe assumption for AA and C battery current draw

I have 5 LED candles with built-in timers, but they eat batteries, so I'm hoping to use an AC adapter to power them instead. They are all different with some using AA batteries and others using C ...
-2
votes
1answer
304 views

Replacement of li po battery with li ion battery [duplicate]

Is it possible to replace a battery for headphones? I would like to replace a 052030 li po battery with a Nokia BL-5C Lithium Ion battery. The li po battery is rated at 130 mAh with 3.7v. The Lithium ...
-1
votes
1answer
136 views

Could I replace headphones NIMH battery with Lithium Ion phone battery of the same voltage?

Is it possible to replace a battery for headphones? I would like to replace a 052030 li po battery with a Nokia BL-5C Lithium Ion battery. The li po battery is rated at 130 mAh with 3.7v. The Lithium ...
0
votes
1answer
72 views

Parallel lipo batteries with mcp73831 charger IC

After reading this very informative blog about load sharing while charging batteries, I'm planning on using an MCP73831 in the same configuration as detailed by the blog for use in a project I'm ...
0
votes
1answer
25 views

Connecting a Lithium battery directly to the GSM module

I have a GSM module (M66 from Quectel) and a single cell Lithium battery,Based on Datasheet module operated in the 3.3 ~ 4.6 V and as I know battery deliver 3.7 ~ 4.2 V based on it's sate of charge....
0
votes
0answers
69 views

Is this a temp sensor on my battery pack?

I am trying to modify a battery pack for a Ridgid nailgun to use replaceable 18650 Li-ion batteries. The original pack looks like this: I've printed an adapter which holds 5 cells and wires to the ...
0
votes
1answer
77 views

XBee power supply design using a Li-Po 3.7V battery

I'm currently designing the power supply for a device which uses XBee PRO S2C as a medium of communication. We are using a Lipo battery 3.7V 3500 mAh battery and TP4056 based battery charger. The ...
0
votes
1answer
18 views

Possibility of series connected LIPO batteries for running stepper motor

I have project where I am using a motor driver DM860A2 to run NEMA 34 85 kg-cm stepper motor. Currently I have used a transformer to supply 48V AC during testing. I have with me four 2200 mah 11.1V ...
1
vote
2answers
46 views

How to calculate the required battery capacity for audio system

I'm converting audio speaker to run on batteries. the speaker is Stagg SMS 8p - RMS 90W, peak power consumption 200W which is consistent with 1A fuse for 220V. Say I go with 12V battery - peak ...
0
votes
1answer
58 views

Oscilloscope differential measurement for battery powered circuit using single probe

I want to measure the voltage across a resistor in my circuit. The circuit is battery powered. I don't want to use the two probe method and calculate A-B to get the results. Can I use one probe to ...
0
votes
1answer
34 views

How to calculate 18650 battery use time?

I am currently powering my mini fan using a normal power bank (the one used for smartphone) which is 5V, 2A output and can last for around 6-7 hours. If I power my fan using two 18650 3.7V 2300mAh (...
2
votes
1answer
55 views

Battery to AC conversion voltage question

I am converting a device that uses 2 [C] size batteries (1.5V) to use a transformer in an AC outlet. I understand that the transformer rating should output 3 volts. However.... I only found a 3.2 ...
0
votes
1answer
87 views

ON/OFF push button circuit with battery under voltage protection

I have put together the push button circuit explained in TI's SCEA048B application report with an under voltage protection using TI's LMS33460 chip. I ended up with the circuit attached. The idea is ...
0
votes
1answer
134 views

Not enough power going through IRLZ44, activated by Arduino

I've a 9v battery and I'm trying to get 9v through my IRLZ44, to power an solenoid. It's a seperate system from my arduino who's sending a 5v signal to the IRLZ44 in order to activate it. For some ...
0
votes
0answers
13 views

Where can I get informations about smartphones battery datasheet?

I'm hardly trying to find the datasheets and I still got nothing :(, what I was try to find is like Asus battery for Zenfone 4 Model: C11P1404 datasheet. Please for your kindness tell me where can I ...