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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29 views

Automatic Battery Charger Circuit. Not getting proper output

i have tried to make a circuit from electronics hub. but the LEDs in the circuit is not glowing. But the circuit is ok charging is doing well. Any problem with this circuit ? please help ?
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1answer
48 views

Increase Laptop Battery life [on hold]

How good is it to use laptop without battery, by giving power directly like in a desktop? I want to decrease the number of charging/discharging cycles of my battery and thus improve its life?
2
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1answer
67 views

How do battery powered thermostats with LCD screens run for so long?

My thermostat runs on batteries but it has an LCD, similar to ...
3
votes
3answers
691 views

I want to replace a car dash cam battery with a capacitor

My car dash cam (G1W) has a weak battery. When it dies the camera will not function at all. I have already replaced it once. The original battery was 200ma, but I found a 320ma one that would fit. It ...
1
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3answers
54 views

Switching between two sources of power to a battery?

This is the simplified system: a battery (3.6 V, 2450 mAH, NiMH) a solar panel (max 5.2 V, 157 mA) a wall charger (5 V, 2100 mA). The battery is constantly being drained, but very slowly (85 mWh ...
1
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1answer
33 views

Charging NiMH batteries with 1W solar panel, charge controller needed?

I want to know if a charge controller would still be needed despite the solar panel never outputting more than C/10 of current to the battery. This is a follow-up about my question here. The solar ...
3
votes
2answers
483 views

How long will a battery last based on these numbers

Hi I asked this question on SU but seemed to have gotten into a bit of trouble, I was referenced here. I am getting into doing hardware build based on things like microcontrollers and ...
1
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2answers
52 views

Voltage drop when measuring battery capacity

I'm trying to build a battery capacity tester for Li-ion batteries. I made this schematic using Arduino: While bush button is not triggered arduino only shows battery voltage on Serial & when ...
0
votes
4answers
97 views

Replacing 18650 cells in laptop battery with greater capacity ones

My laptop battery died and I can't find a replacement (old laptop) so I'm going to need to replace myself the 18650 cells it has. It is an 8-cell battery (a series of 4 banks of 2), making the whole ...
0
votes
1answer
54 views

How best to power down an Arduino for ~5 minutes at a time?

Reading over the datasheet it appears the longest it can shutdown for is 8s so should I just keep a counter in the loop method that checks if it's run 38 times and then execute the code I want? Would ...
0
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0answers
26 views

Best Battery for saving small charge Overtime

Working on a project that requires the use of piezoelectric effect. It is true that the charge per compression can be very small. Trying to figure out what the ...
1
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1answer
40 views

Discharge constant 2A-3A current from a battery

I am supposed to drain a constant current of 2A or 3A from a battery (most probably a NiMH battery). What could be a possible way to do that ? Purpose of doing it is to calculate the battery's Energy ...
0
votes
1answer
43 views

Using a development board to charge a lipo battery [on hold]

Ok, I'm not specialist in electronic but just enthousiast. I'm searching a solution to charge lipo battery in-board (to build tablet with a micro computer like Raspberry Pi) So, I have seen this ...
0
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3answers
91 views

why does the model s use multiple batteries?

The Tesla Model S and NASA's Robonaut both use a battery pack that consists of an array of hundreds of battery cells. Why don't the engineers just create one giant cell?
0
votes
1answer
23 views

LM3914 4S lithium polymer meter

I need help creating an LM3914 voltage meter (in bar mode). I looked at the datasheet and understand how to create a standard voltmeter (0-5V for example). However, what I need is an expanded range ...
0
votes
1answer
60 views

What is the net charge held in a battery?

I assume that the net charge held in a battery is always 0. I.e. the total charge held in the positive terminal of the battery is always equal to the total charge held in the negative terminal. Is ...
0
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0answers
46 views

Solar panel - voltage regulator

I am contemplating the possibility to run a trolling motor (to push my canoe) with a 250W solar panel. Electrical Specifications: Peak power: 250 W (minus 0, plus 5W Tolerance!) Optimum operating ...
1
vote
1answer
129 views

replace battery with capacitor

I am looking for a small form factor capacitor that is capable of 12V at 500 mA for approx 2 seconds. This is to open a small 12vdc air solenoid that is under about 100PSI of pressure for just 2 ...
-1
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0answers
55 views

Battery Charger

I am working in a industry where we have a battery bank connected with a battery charger in usually in charging mode but whenever black out occurs at that time by using battery we can provide a power ...
0
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1answer
38 views

Current output of a solar panel when connected to battery and load

I am trying to build a microgrid (final year project) where a 100-250 W 48V solar array will charge a 24V battery bank and a couple of 24V loads (40W lights, 60W fan). Batteries used (7 of this in ...
0
votes
1answer
42 views

How to maintain equal discharging on batteries

I am currently building a robot that has one 12V battery for each drive motor. The system was originally setup so that the two motor/motorcontroller/battery systems were completely separate. After ...
0
votes
1answer
44 views

GSM Battery/Amperage Usage

I have a general question. I have a GSM module (adh8066 link to data sheet below) that I purchased from sparkfun. In the data sheet, it states that in tx mode, the module can draw up to 2 amps @ ...
0
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4answers
152 views

With today's technology, is it possible to charge a battery over 100% without exploding? [closed]

We all know who Iron Man is. Hollywood makes a nice job to make him look like a genious in electronic. However, there is a scene where his suit charges it's batteries to 475%. There is another ...
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2answers
39 views

NIMH Battery excedes charge limit when plugged into Tenergy Charger? [closed]

I recently purchased a NIMH Battery (5000MAH, 7.2V) and when I plugged it into my Tenergy Battery Charger I set the charge rate to 5amps. After watching it for several minutes the "voltage" jumped to ...
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3answers
187 views

How long will this appliance run from a battery?

How long can I run a water pump which requires 12V and 50W from a 12V, 40Ah, 400A car battery? Can you explain how this was calculated?
0
votes
2answers
66 views

switch OpAmp down to minimize power consumption

I'm currently designing a board which senses some stuff. The board is powered using a 6V lithium battery. According to my sensor+OpAmp logic I need to split the voltage into +/-3V. The circuitry to ...
0
votes
1answer
55 views

12v lead acid battery charged directly by 17v solar panel

I don't have a charge controller, I wanna know if I can directly connect the solar panel (17v max when directly hit by sun light 1.5W) to the 12v battery? Someone in arduino group on facebook said ...
0
votes
1answer
69 views

Powering board and charging coin cell at the same time

Here is what I have: 2035 coin cell battery ATmega328 I want to have an ability to plug micro/mini usb cord and power circuit from usb and charge battery. Circuit has extremely low power ...
0
votes
1answer
88 views

Can I use a 11.1V LiPo directly on 12V electronics?

I'm considering using a TS351 video transmitter (6.5-12V) and a 700TVL camera (8-13V) on an RC aircraft where a 3S LiPo battery (11.1V) is used as the main power source. The rest of the electronics on ...
-1
votes
1answer
46 views

Fast rising voltage on lead acid battery while charging

i have a couple of 12V sealed lead-acid batteries.Whitch i have to charge.But when i hook one of them on the charger at 12V/1A (the battery is 10Ah) the voltage from 12.6 drasticly increases up to 14V ...
-1
votes
0answers
5 views

what can happen to car and battery when a battery charger was left on with only black terminal connected? [migrated]

IV asked many people why the red cable must be connected before the black, and why,(IV been told) it can do damage to your car and Battery if this isn't done properly. my reason for taking the rout ...
2
votes
1answer
81 views

Choosing a linear regulator vs. switching regulator for low-power application?

I have a 3.6 V battery that I want to regulate down to 3.3 V and 1.8 V rails. I have already asked about the configuration of the two rails here. My question here however is whether I should use a ...
0
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2answers
74 views

How to regulate a 3.6 V battery to two power rails (3.3 V and 1.8 V)?

I have a 3.6 V battery from which I need two voltage rails, one that is 3.3 V and one that is 1.8 V. How should I design this circuit such that it is the most power efficient? Here is what I was ...
2
votes
1answer
129 views

Using a capacitor to keep circuit powered for 1s after battery disconnected?

I am planning on using a 3.3V GPS module which draws 22mA. The module has a requirement that a shutdown sequence be initiated 1s before power is removed from the IC. If power is removed without ...
0
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3answers
89 views

Why does a simple circuit drain a battery slowly?

OK, so if you directly connect the two terminals of a battery, there is very little resistance in the circuit and you will drain the battery very quickly. However if you have a very simple circuit, ...
3
votes
1answer
38 views

How to select a DC cable connection type based on current?

I have a battery and DC-DC converter solution that I've ordered. The solution will output 20A continuously at 5V, and will sometimes pulse up to 30A for durations up to 10 seconds. I believe voltage ...
4
votes
2answers
613 views

What battery to use?

Hi im a newbie when it comes to electronics, I want to design a robot similar to this: http://www.me.berkeley.edu/ME102B/Past_Proj/f09/1%20BearClaw%20Tennis%20Ball%20Collector/design.php The thing ...
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votes
0answers
20 views

how to determine length of nichrome wire in respect to temperature [duplicate]

If anyone of you help me in finding specification(awg of nichrome wire required) for a 2 m nichrome wire to heat up to 65 degree Celsius .Voltage applied is 12 v.I want to use it by coiling it to ...
0
votes
2answers
46 views

How can I connect a phone battery to TV remote control? [closed]

I have an old tv with an IR remote control. It has become quite bothering for me to change the remote control's batteries every other week. I thought to myself why not connect a Chinese phone battery ...
0
votes
2answers
65 views

I have virtually no understanding of how batteries work and charge, and have various questions on them

I'm doing research into portable power generators for a university class and need help understanding how charging a device works. From my research, I've found certain methods of harvesting energy can ...
0
votes
1answer
36 views

Split power across three circuits with difrerent resistance and provide equal current

simulate this circuit – Schematic created using CircuitLab Me and a friend are working on a project and have three circuits with resistance (8.9k ohm) across them and a single 9v battery. ...
5
votes
3answers
1k views

why don't serial lights get dimmer..?

If 2 lamps of same power are connected in series, the first one connected glows better and the next one gets dimmer..then Why doesnt the serial lights( Christmas lights ) get dimmer even though they ...
0
votes
1answer
85 views

How long will my battery last under this load and with this source?

I need to calculate how long my battery will last until it is completely discharged. I have a load that will draw 154 uA at 1.8 V for a power of 277.2 mW. Assuming that this is running indefinitely ...
0
votes
2answers
79 views

Charging a battery with two sources, should I put them in series or parallel?

I would like to charge a battery using two sources (solar and a generator), should I put the two sources in series or parallel before the battery? The battery is actually 3 batteries in series. Each ...
0
votes
1answer
105 views

replace 3 wires tablet battery with 2 wires one

I want to replace my 300 mAh Chinese tablet battery with a 3000mAh new one, My old battery has 3 wires red , black and White, the white one connect to a point on tablet board named "T" which I have ...
0
votes
3answers
81 views

How Do Batteries Behave In Series-Parallel (Verify)

Hi I am confused about How batteries behave in series and parallel. I read online and saw that as you stack more batteries in series, the voltage adds together and the mA's stay the same, and if you ...
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votes
1answer
72 views

Is it ok to repace a 300mAh tablet battery with a 3000mAh one

I want to replace my 300 mAh Chinese tablet battery with a 3000mAh new one, My old battery has 3 wires red , black and White, the white one connect to a point on tablet board named "T".. what is this ...
0
votes
1answer
36 views

How to pick a rechargeable battery?

I need a rechargeable battery that can produce about 10 Wh per day. In a day this battery/ies should produce 281 mA for about 15 s, 265 mA for about 30 min, and about 131 mA for the rest of the day. ...
2
votes
1answer
102 views

Design a circuit for rechargeable batteries supplied by a solar panel and generator?

I want to design a circuit for a rechargeable battery (or batteries) that can be charged by both a solar panel and a generator. I am working on the same project as described here, but my focus is on ...
0
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0answers
51 views

Input power needed to Adruino and 500rpm DC motor

I have an Arduino UNO, two DC motors of 5kg torque and 500rpm(l293D motor driver), two ultrasonic sensors, and a bluetooth. I powered the Arduino with USB cable from PC. Then a 12V battery connected ...