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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25 views

If i lower voltage drawn from a battery will it last longer?

I have a water pump that operates between 5-12v at 3amps. At 5v the water flows slower and at 12v it flows fast. If I have it connected to a 12v battery and use a step down converter to convert the ...
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1answer
32 views

Lightweight battery replacement for GPS [on hold]

I've been using a 12V, 7Ah sealed lead acid battery for my GPS equipment, but need something lighter. The battery(s) will be charged daily. Does anyone have suggestions for a battery or battery ...
0
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1answer
31 views

Passive Cell Balancing of an 2S3P Battery Pack

I'm currently attempting to design a passive cell balancer for a 2S3P battery pack (pictured below). Being new to power engineering I'm not sure where to start looking; I know I want to go with a "...
0
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1answer
69 views

Is it possible to damage phone battery when charging with a current source?

Is it possible to damage a phone battery when charging with a current source? Situation: I am currently busy with a project where we want to use 200 watt solar panel to charge as many phones as ...
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1answer
44 views

Charging a 12V battery bank while using it

I have (4) 12V 190 Ah AGM batteries connected in series. I want to run a portable A/C unit through a 2000 watt inverter connected to those batteries and charge the batteries simultaniously with a ...
1
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1answer
27 views

Can I charge a 12V 2A NiCd battery with 18V 14.6A?

I have a 12V 2A NiCd battery which I want to charge. I have a power unit that puts out 18V 14.6A. Can I use it to charge it? Would the battery just draw the current it needs or would it always put ...
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1answer
27 views

Battery Pack Configuration

I currently am using Li-FePO4 cells in the configuration below (picture): I'm researching how to build a passive cell balancer for this battery pack. Though I'm getting confused on some specs I'm ...
0
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3answers
59 views

Finding Total Watts Across Batteries?

When finding watts where you have the amps and volts you can find it by multiplying amps and volts. A x V = W If I have eight 6 volt batteries at 75amps each, ...
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votes
1answer
70 views

LiFePO4 Constant Current charging circuit with micro controller

I made a small off-grid solar station a few years ago, that was relying on lead acid batteries. I am now planning to change it for a 12v 8Ah LiFePO4 battery, because of it's low weight, space needed, ...
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2answers
50 views

Lithium charge module on NiMh batteries

Can I use a lithium charge module on NiMh batteries? The charge module has 2 led, one for charging and one for full that I would really like to use with my NiMh batteries.
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0answers
50 views

Solar powered battery/USB charger

I am trying to build a solar powered battery pack, 3 x AA batteries and then use that to charge my USB device all in one little box. I've done my research and hope that what I have will work but that'...
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2answers
40 views

3xAA Battery Pack how to wire?

I've mistakenly purchase an unwired battery pack, I'm unsure about how to wire this, never done anything like this but I thought if try and understand wiring a bit better. I have a 3xAA battery pack ...
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1answer
73 views

Building a Lightsaber with pretty much on electrical experience

I bought a third party toy fx style "lightsaber" recently. It only has the light effect which is brilliant. I wanted to add sound to it on a budget so I took the pcb out of an old style toy and wired ...
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2answers
107 views

Using an Arduino (If Needed) to Charge 18650 Battery [closed]

I am looking for a way to charge 18650 battery with an Arduino (If needed) as simple as possible. I have seen tutorials where you have to buy 10 diffident parts. I just want the simple (But wont ...
1
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2answers
87 views

Can you really overcharge a battery at its rated voltages?

Say i have a 12v battery dischared to 11v and i connect it in parallel with an AC Adapter whose final output is 12v dc In ideal case any current flow towards battery should stop as soon as battery ...
0
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0answers
27 views

NiMH battery cahrger

I am trying to design a smart NiMH battery charger. I will use micro-controller, to do the charging control . The method I will use to detect charge full is Delta V . In a short, I will keep ...
-1
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0answers
27 views

Solar battery trouble

I have an off grid solar energy system that is connected via a charge regulator to a battery bank consisting of 6 2v batteries. At the moment I have noticed the regulator going on to float really ...
0
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0answers
45 views

Measure individual cell voltages in a 111-cell battery stack with differential ADC

I have string of 111 lead acid cells (2V each) connected in series with the stack negative terminal tied to Ground. I have 18 TI F28377S MCU launchpads with differential ADC onboard (6 differential ...
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3answers
98 views

Using capacitor as a rechargeable battery

As part of my learning of electronics, I'm currently trying to develop my own network of sensors. So far, I've managed to make myself a satisfying small setup : A few nodes, built with an ...
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2answers
103 views

Simplest “battery low” indicator for a 3.7 volt lithium ion battery

I just need a single LED to light up when the voltage drops below a threshold like say 3.3 volt ( sharpness is not that important ). I know basic electronics like transistors,logic gates etc. On ...
0
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1answer
42 views

How does charge/discharge current increase battery temperature?

I already know that charging or discharging a battery causes it to heat up, and that increase in heat is proportional to the current. But what physical process is behind this? My back-of-the-envelope ...
0
votes
1answer
67 views

Can a rechargable dash cam battery be replaced with a dc-dc converter in-place?

While reading this question, where a user is having difficulties with his dashboard camera battery, I noticed that one of the answers suggests (or seems to suggest) to replace the existing battery ...
0
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1answer
58 views

Does the battery have to be rated for the full starting current of a DC motor

Do we have to select a battery capable of delivering the full starting current (which is high as it is the stall current) of the DC motor, or is it enough if the battery is rated for a bit more ...
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1answer
34 views

Battery Charge and Discharge time for constant voltage charge battery, and how to know if its fully charged

In my Project I used below battery and a battery back SMPS. Battery Type:- Sealed Lead acid , Volt:- 12V, Ah:-7AH Charge parameters:- Constant voltage charge with voltage regulation Standby use 13.6V-...
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2answers
43 views

Lithium Ion Battery Capacity: Discharge Analysis

I have taken apart a battery module consisting A123 Systems ANR26650-M1A cells (they are technically Lithium-Iron-Phospate (LiFeo4) cells) that were used in a commercially controlled environment. ...
0
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1answer
29 views

Powering a self-drive piezo buzzer with capacitors?

I have a project I am working on where I want to power a "self-drive" piezo buzzer for 20-30 seconds. However, in order to provide the power to this piezo, I would like to ideally use capacitors in ...
0
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1answer
66 views

Replacing a 7.2 volt battery pack [closed]

I have a dead battery from my Tivoli Pal radio that I wish to replace. It is a NiMH 7.2V 1400mAh like this one (the mAh being the only difference I guess). Would it be safe to take the connector off ...
2
votes
3answers
216 views

Is it reliable to use Li-ion battery + LDO for analog circuits and 3.3v digital circuits?

I'm doing a project measuring ambient light with 'photodiode + op-amp + ADC + cortex-M0+.' For a while, I used stable DC source for providing 3.3v to every components. The next milestone is making ...
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1answer
38 views

Wire size for battery interconnects

I'm putting together a bank of 3 batteries, connected in parallel for use in a solar PV system. The primary load will come from a 1000W inverter (2000w surge). The inverter manual recommends using a ...
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0answers
26 views

MAX1555 without load sharing [duplicate]

Does MAX1555 supports charging lipo battery while load is connected ?
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2answers
77 views

How to choose the suitable battery for 6 stepper motors?

I am new to electronics and trying to build a robot that uses 6 stepper motors. I bought 6 of this stepper motor and used Pololu stepper motor driver A4988 to drive them but I have an issue with the ...
0
votes
2answers
42 views

Alkaline Battery for Boost converter for 1000ma current requirement?

I am working on a very small scale project that needs 300-600ma bursts at 5v for 10-20 seconds (a bank of LEDs) followed by a period of low power consumption (around 10ma for around an hour or so for ...
0
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2answers
139 views

Low power battery backup

I am currently working on a low power battery backed data logger. An Intersil ICL7673 backup switch is used to switch between the battery and external power. Because the circuit draws more than 30mA I ...
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1answer
59 views

Power solenoid valve battery

I'm trying to make an Arduino controlled irrigation timer. My idea is to use an Arduino pro mini and a cheap solenoid valve, wired to a TIP120. However, from my calculations, it's impossible to run ...
-1
votes
2answers
73 views

What determines a battery's charging rate?

I have a power bank which is rated to store 20000mAh of charge and 72Wh of energy. It is recommended by the manufacturer to charge it with a Quick Charge charger which provides 1.5 Amps with 12 Volts. ...
0
votes
1answer
73 views

Laptop to “Desktop” Conversion [closed]

I have an old laptop which I no longer have the charger for. I ordered a new charger for the same laptop series, but the plug is too large, and it is unlikely that I will find the same adapter (Acer ...
0
votes
1answer
106 views

Make +6 and -6 and +3.6 and -3.6 volts from a 12 volt battery

We're working on a project that requires a stable +6 and -6 and +3.6 and -3.6 volts from a 12 volt battery. It has to be stable, even when the voltage of the source goes down. We came up with this: ...
0
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1answer
71 views

What happens when discharging coin cell battery too much?

BACKGROUND: I'm working on a project where we use the nRF51 Bluetooth low energy chip, and our first prototype boards just arrived. So I've made some power measurements trying to calculate the ...
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votes
2answers
52 views

I have a circuit with a 9V battery, followed by 3 10 ohm resistors, and an led all in series…?

simulate this circuit – Schematic created using CircuitLab I have a circuit with a 9V battery, followed by 3 10 ohm resistors, and an led all in series. The led has a forward voltage of 2.5V ...
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votes
3answers
143 views

Replace AAA battery with a smaller battery?

I know it is possible to replace a AAA battery with a power source, and that it is possible to use AAA batteries as AA batteries (these are what I find when I google this question). My problem is ...
0
votes
2answers
98 views

Using Arduino to power a 4 terminal phone [closed]

My dad took my battery for misbehaving (No questions!) but I still want to use my phone (Huawei Honor 3c). However, when I use a USB plug, the phone only vibrates constantly (Why does it do this?). ...
2
votes
0answers
48 views

Power supply ORing without ORing controller IC [duplicate]

The objective is to fallback on battery power if external supply (5V) is cut off. The ORing circuit should have as low voltage drop as possible when powered by the battery. The business end of the ...
3
votes
3answers
772 views

Explosion in a battery

I recently joined a 9 volt cell and two 1.5 volt cells to get an output voltage of nearly 6 volt. For 15 minutes or so, the battery worked perfectly. It did not even show any sign of heating and in ...
1
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1answer
63 views

Battery Charger using a buck converter

I'm designing a Lead Acid battery charger with 3 stages. For the 2nd stage (constant voltage stage) as it is written in literature: the voltage applied on the battery must be dependent on temperature. ...
3
votes
1answer
57 views

Replacing Lithium batteries with larger ones

I have some background with electronics, but that was in the "old days", so my knowledge of lithium battery types and charging processes is very limited. I have a bunch of gadgets with one of those ...
0
votes
3answers
71 views

Measuring state of charge of a non rechargeable CR123A lithium battery

Is there a method (voltage, resistance, other...) of measuring leftover charge in a non rechargeable lithium battery? Background: I'm trying to get a general overview of power consumption for few ...
-1
votes
1answer
54 views

How to power a 150W with rechargable bateries?

I would like to build a gocart using a 150W 24V DC motor. To power it I would like to build a battery pack using 2Ah rechargeable batteries. The motor will run about 2 hours at 50% capacity (the ...
1
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1answer
177 views

What are the 8 wires on this rechargeable lithium-ion battery?

I am trying to replace a rechargeable lithium ion battery with one that has a longer lifespan when charged. The one I have has 8 wires, but every one I find has 2. It has 3 red, 3 black, 1 yellow, and ...