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

learn more… | top users | synonyms (1)

1
vote
0answers
22 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
votes
0answers
24 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 ...
0
votes
3answers
114 views

Generating electricity by moving door handle to produce 3 Watts?

I want to attach a generator to a door handle and have the output charge a battery. My system needs to provide about 3 Watts. A similar question was asked here and I referenced it to get an idea of ...
2
votes
2answers
70 views

what is the Outer casing of alkaline battery made of?

what is the outer casing of a typical small 9v alkaline battery made of? Is it conductive?
0
votes
0answers
40 views

Concerns About Solar Charging Tree House Lights

I'm Building a lighting system for my tree house with 4 LED work lights I picked up at the hardware store. I want it to have solar charging and be operable via one switch. Theres alot of background so ...
0
votes
1answer
52 views

How can the source impedance of an energy source be made zero?

With regards to the Maximum Power Theorem (Princeton.edu); The theorem was originally misunderstood (notably by Joule) to imply that a system consisting of an electric motor driven by a battery ...
1
vote
2answers
82 views

Power-Supply “Combination”: Solar for voltage + Battery for current

I'm rather new to circuits & DIY electronics, but am thoroughly enjoying tinkering with my new RaspberryPi and assorted components. I'm trying to power the device using a few simple solar panels I ...
1
vote
2answers
58 views

Trouble with bringing a brand new Li-ion to life [on hold]

I have an old Galaxy S2 phone and I just bought a brand new battery for it. In fact, this is a second new battery. I returned the first one as it wouldn't charge in the phone. Since I am having the ...
0
votes
1answer
37 views

Power MUX for USB and AC adapter

I have a handheld, Li-ion battery powered project involving dual path power input (USB and AC). Initially, the circuit is wired like this: It wasn't before long I found the problem when both USB ...
0
votes
1answer
36 views

charging lead acid cells

And I have forklift battery 24V which is almost at the end of life. The 24V charger is very strong and heat battery and not working properly. I have one 12V battery charger, which works very fine. ...
0
votes
2answers
66 views

Shelf life of a lithium polymer battery

I am trying to determine the shelf life of a typical Li-Polymer battery. I have Googled but can't find any definitive view on the matter. There are two questions regarding the battery shown: 1. What ...
3
votes
6answers
157 views

Batteries in parallel vs voltage signals in parallel

From a practical point of view, when you connect two audio signals to one speaker the result is that both audio signals can be heard. That means the two voltage waves were added, correct? However, ...
0
votes
0answers
33 views

Dual power sources to 12V batteries in MPPT solar setup? [closed]

I have 12V batteries charged by a 1KW 60V solar panel array. The system uses an 80Amp MPPT solar charge controller. I would like to add a secondary power source - possibly a 12V peltier based ...
1
vote
2answers
72 views

Extending the backup runtime of a UPS with an external car battery

I'm looking for a simple/inexpensive way to have a longer power backup time. My fist thought was putting 2 cheap UPSes in parallel. But I quickly found it's not that simple. You would need another ...
1
vote
1answer
55 views

Charging li-ion cell using constant-voltage only

Introduction Various resources [1] [2] state that the optimal method of charging a li-ion cell -- such as one found in a mobile phone -- is to charge at a constant current (usually <1C) until a ...
0
votes
1answer
68 views

Charging 15 AA battery Pack

I plan on making 2 battery packs from rechargeable AA batteries. Each pack will have 15 AA batteries which will put out 20 Volts to power a meter. Since I plan on soldering tabs on the batteries, I ...
1
vote
1answer
45 views

Nimh battery for Electric Bike

I've come into an electric bike that currently has a nimh, 24v, 20cell battery pack. On the pack as well it says 8000mah. The previuos owner has misplaced the original charger :( The bike has been ...
0
votes
1answer
67 views

What is the minimum voltage requited to charge a cell phone? [closed]

When charging a cell phone, what is the minimum input voltage to the phone required not the battery directly, but the actual phone? Is it actually five volts that the wall charger puts out, or can it ...
7
votes
2answers
766 views

Is it ok to keep rechargeable batteries in an unplugged charger?

Is it ok to keep rechargeable batteries in an unplugged charger considering possibility of discharging the batteries via the charger's circuitry, etc.
0
votes
1answer
64 views

custom battery for CO2 generation

I want to design a small, cheap device that generates CO2 but I also want to capture the voltage to drive an LED. Any advice about which half-cell reaction I should use (oxalate?) or battery design. I ...
0
votes
2answers
74 views

Modifying a Simple Transformer Circuit

I have a heavy 14.4V 1.5A heavy battery charger I would like to use to charge my car battery (over time, monitored for heat in a well ventilated area). When I plug the battery to the charger as is, ...
0
votes
1answer
90 views

Why do external batteries (a.k.a power banks) have power buttons?

At first thought, it's a good idea to prevent any short circuiting via contact with external hazards such as water or coins, but how often do that happen? If the battery is already in contact with ...
2
votes
1answer
48 views

how to detect battery failure

I want to design a LIPO battery control circuit for 10 batteries 3V7 500mAh connected in 2P4S. This circuit need to control the charger and disconct the charger in case of battery overvoltage or ...
-1
votes
2answers
67 views

What does current draw mean for the [closed]

Does this mean that the battery only outputs current equal to the amount of current draw? I always thought that batteries outputted a constant output, but apparently after some research I found this ...
2
votes
3answers
172 views

How can I send one bit one mile with one battery?

This summer I will be attending a large music festival for the second year. I will be going with other people this time, and I'd like to be able to communicate with the other people wirelessly in ...
2
votes
2answers
96 views

How do I switch between primary battery and backup battery, if the primary battery drops below operating voltage or get disconnected?

I have low power system which requires dual batteries to overcome the loop holes in the current system. Currently I have two batteries: Primary Battery Li-Ion 3.7V 1800mAh and a secondary battery ...
-1
votes
1answer
53 views

Help with high current single cell lithium charging

I am designing a system to charge a single cell lithium battery. It requires pass-through, path-selection, over and under voltage protection. The bottom line is this system needs to power a device ...
1
vote
2answers
67 views

using a capacitor for an off-grid system

New to the side and have very little knowledge on electrical systems. I'm trying to come up with a good off-grid system for my small house and have the idea of a PV array with a battery bank, charge ...
0
votes
0answers
63 views

Charging Batteries in Series

So I am working on charging 2 batteries in series, and have an odd situation that I'm hoping to get answered. I have a single bank charger that outputs 8A and a dual bank charger that is 20A total ...
0
votes
2answers
59 views

Do I need a balance charger if i use a Protection Circuit Module for Li-ion batteries?

I'm looking into making a battery pack for a portable speaker system. If I use one of these: ...
0
votes
2answers
49 views

Are BLE modules capable of working with a CR2032 battery? [duplicate]

I keep reading that the Bluetooth Low Energy modules are capable of working with a CR2032 battery for years, but their consumption is around 20mA and the max discharge of a CR2032 is around 3mA (200uA ...
0
votes
1answer
59 views

battery balancer behaving strange

I am using a 3S (series) lithium polymer batteries (the ones we get from hobby king). I have designed 2 boards . 1) charging board - using the BQ24170. 2) balancing board using - S8204B. I am ...
0
votes
1answer
41 views

Using Solicore flexible batteries as replacement of CR2032

A device that I am using (Gimbal iBeacon series 10) uses 1 CR2032 battery that lasts for 3 months. I am trying to find out if I can replace it with a flexible unit from Solicore. CR2032 spec from ...
1
vote
1answer
61 views

Battery Discharge

I am making a circuit to discharge an 18V Li-ion battery, with multiple cells, in order to condition it. Each 18V cell has a capacity of 100Wh when fully charged. I would like to control the condition ...
1
vote
1answer
54 views

Choosing Correct Switching Power IC for 5v 2A Output from 2S Battery

I am designing a Power Circuitry for a Application that needs to feed 1x Beaglebone Black (5v), 1x Device with 600mA (5v), and 2x XBeePro Modules (3.3v) via a 2S (7.4v 1Ah LiPo) Pack. The Plan ...
0
votes
2answers
78 views

Charging Li-ion batteries in series

Recently, I bought a DC 12300, a 12V battery with high capacity 3000mAh and I got a charger 12.6V and 500mA output. First thing I did when I got the battery, I measured its voltage and it was 2V. ...
0
votes
1answer
60 views

Adafruit Trinket Solar Power

I'm curious if anyone has experience with getting a simple board like the Adafruit Trinket or DigiSpark or any of the other ATTiny based clone boards running on solar power. E.g. with a solar panel ...
4
votes
2answers
210 views

How deep should we discharge lithium batteries to maximise their lifetime?

Recently I posted an answer mentioning the very classic "lithium batteries like partial discharges, so design your system for limited depth of discharge". But then I wondered: with partial discharges, ...
1
vote
1answer
120 views

simple battery back-up power path design idea

I need an application with back-up battery. Like UPS when power go down device will work with battery. There are chips with power path option but it is diffucult me to get components from outisde of ...
0
votes
2answers
68 views

Power and control 3 phase ac induction motors with dc source

Background So we are making a drive system to be used in a medium sized catamaran. The catamaran will use two water-jets powered by two 3 phase 380v ac induction motors. The entire system will be ...
1
vote
1answer
68 views

Eneloop rechargable batteries for mouse? [closed]

I have a Apple Mighty Mouse, and I want to use rechargeable batteries, but I read somewhere on such a device I should only use Eneloop rechargeable batteries as they hold a charge when the device is ...
0
votes
2answers
120 views

Replace 2 AA batteries with 5Vdc phone charger

Is there a safe and easy way to replace 2 AA batteries that power 10 LEDs in parallel with an old 5Vdc 900mA phone charger? I think the LEDs are standard 20mA ones.
-1
votes
2answers
91 views

Is it possible to buy a better 12v battery for kids ride on? [closed]

My kids have a 12v ride on train. The battery is not lasting very long at all, after one lap of the garden it is going too slow. I don't want it to necessarily go faster, just for the battery to last ...
0
votes
1answer
75 views

Powering a rechargeable battery with a solar cell

just a short question. I have a solar cell that outputs 7V. I want it to charge a 9V battery source. Is there anything I should be worried about or take note if I try to do this?
0
votes
1answer
81 views

Laptop shows battery is 4% charged, but it is charged to maximum [closed]

I got old acer computer and i noticed that when I plug in charger, it says it is charging, but after 5 hours it still was 4% only, so i decided to get out battery and check it with manualy using ...
-2
votes
0answers
37 views

connecting two 3.7v battery's to tablet, in parallel for extend the working capa [migrated]

my tablet have 2500mah battery. it works for four hour. but I want to extend the source power. so I want to connect another same voltage battery to tablet. battery was 1500mah. can i make connection ...
1
vote
0answers
47 views

Is lithium ion battery sutaible for all terrain vehicle

I have manufactured an all terrain vehicle.Is li-ion can sustain in the jerking of car,if battery is fully packed and waterproofed.If not,which battery should i use? Can i go for Li-polymer battery? ...
0
votes
1answer
36 views

Li-Ion Charging - Constant Voltage Stage

The charging curve for Li-Ion batteries (explained here) has a final constant voltage stage where the charge voltage plateaus and the charge controller slowly shuts off the current until it reaches ...
0
votes
2answers
106 views

Increase a battery Ah rating

How do I increase the Ah rating of a battery? Will connecting two batteries in parallel increase the overall AH rating?
3
votes
2answers
86 views

How does a laptop maintain battery at full?

I know how a laptop battery becomes charged, however, I am not so sure how the power is maintained when when the battery has been charged to the maximum. I am unsure whether the laptop would switch ...