Please specify the battery type in your question. Include chemistry (e.g. lead-acid), voltage, number of cells and how they are connected (series or parallel), capacity (in A·h or W·h).

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0
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3answers
29 views

Charging circuit for bulk 1.2v 1200mah ni-cad batteries

I am seeking advice about how to construct a charging circuit for 1.2v 1200mah ni-cad batteries. I have around 60-70 of these batteries and I want to create a bulk charging circuit so I can charge 5 ...
2
votes
1answer
366 views

Trying to understand Battery Chargers

I just started studying about batteries and battery chargers. I have this simple query so please help me out. I am trying to charge my 3000mah li-ion battery. The battery voltage is around 3.6v and ...
0
votes
1answer
22 views

suggestions for solar charging battery-operated device

My battery-powered wireless device draws about 50mA @ 5V. I’m thinking of powering this off a 12V 7Ah SLA battery that is topped up with a small solar panel (12V, maybe 500mA or so). 12V to 5V will ...
1
vote
1answer
50 views

Calculating power with RMS

Suppose I have a rechargeable 70 kWh battery , and I use 120 V rms from my house with a 10 A RMS circuit. To find the max power of this circuit, is it just P = VI, since both the voltage and current ...
0
votes
2answers
62 views

USB powering batteries without OS support?

On a bare-metal project I have in mind, I would like to know if I can avoid to implement the multiple USB specs (O/E/xHCI) and still benefit from usb charging my battery. It will run on a almost ...
0
votes
3answers
77 views

Car battery capacity in colder countries

The capacity of the battery is affected when the temperature drops, particularly Lead-acid batteries. So how in cold countries this situation is solved. In this PDF about automotive batteries at low ...
0
votes
1answer
39 views

Battery Charging Using Battery University Information:

How would I use this information from Battery University to properly charge a car starter/ing battery--with the following specs: Vnom=12, CCA=640, CA=800, RC=110 minutes, AH=? I plan to use a ...
0
votes
1answer
61 views

P channel mosfet battery charging/power selection circuit help

I am a hobbyist and new to this, but I am not sure if my circuit it right. The goal is: To power the rest of the circuit from a DC source, a USB, or a battery, in that order. When there is no DC or ...
-3
votes
0answers
105 views

charging two 18650's with solar panels and usb charger [on hold]

I want to charge my phone using some batteries charged by solar panels. I was told that I could connect a 5v usb charger too, but i don't know how I should connect it. how should i connect it? (the ...
-1
votes
2answers
40 views

How to determine current for LG g2 mobil phone battery? [closed]

I would appreciate if someone can help me with this. Here is spec: http://www.gsmarena.com/lg_g2-5543.php How can I know how much current I should use to charge LG g2 battery? Could I use 250mA, is ...
0
votes
1answer
26 views

LiPo Charging Ciruit - Switching Help

I do understand that similar questions and maybe even the same question has been asked before, I've found them but unfortunately as a result of inexperience on my part I have been unable to adapt the ...
3
votes
0answers
50 views

To pulse or not to pulse

It is accepted practice to maintain lead acid batteries at a float voltage of roughly 2.3 Volts per cell .The precise value depends on battery type and battery chemistry and ambient temperature .We ...
2
votes
1answer
36 views

Battery charger output power higher than input?

i would like to ask about battery charger i saw at work :) the plate on charger says: Input voltage 3 phase ac Min 400v Nominal 400-415v Max 456v Input current 20A Output 110v DC 9kW 28v ...
2
votes
1answer
60 views

Can I charge a lead acid battery with a lithium ion battery?

I am asking specifically about automotive 12V lead acid batteries but I suppose the principles may be universal. If I were to connect a fully charged 15V Li-ion battery to a discharged 12V lead acid ...
2
votes
1answer
43 views

Battery Pack Management: need to balance during discharge?

I'm looking into the fault detection and monitoring subsystem of out unmanned vehicles (airborne and ground-based) batteries. We employ LiPo-battery packs of various configurations which are charged ...
2
votes
1answer
32 views

Solar Power Watts/Volts/Amps

I have a 12v battery that is rated at 220ah. I have solar panels rated at 500 watts total. I'm using a MPPT charge controller rated for 12/24 volts I only have a rudimentary understanding of ...
1
vote
1answer
61 views

Charging phone battery from DC supply

I am planning a project very similar to the one seen in the following gallery. (http://imgur.com/a/G7iww) I like the idea of having my phone plugged into the same unit for charging. My only concern is ...
-1
votes
2answers
48 views

What does battery charger's current rating mean? [duplicate]

I am basically a software engineer but have some interest in electronics so this is probably a very basic question. I understand theoretically a battery or power source can provide as much current as ...
1
vote
2answers
55 views

Internal reference voltage of Voltage Regulator - what does it depend on?

I know this might be somehow specific and narrow question but that issue bothers me. I've implemented the BQ24450 charger controller circuit presented in figure 10 of ...
2
votes
0answers
67 views

Battery monitor for a camper van electrical system

As one of my first DIY projects, I'm going to build a battery monitor for the DC battery/solar/inverter system in my camper van. The van has 440 Ah of lead acid batteries and DC currents up to 200A ...
0
votes
0answers
6 views

Charging circuit [migrated]

I have a motorhome and tow my car behind. Since I have to leave car in accessory so steering wheel is unlocked, the battery doesnt last a long time.. I want to run a dc line from motorhome hookup ...
0
votes
0answers
13 views

Can a 3.7 Watt LiPo battery trigger the charging symbol on an iPhone? [migrated]

I am trying to use a 3.7 Volt 1 Amp (so it's 3.7 Watts) Lithium Polymer battery to charge or at least trigger the charging symbol on an iPhone 5. I have charged the battery fully using the Lithium ...
0
votes
1answer
108 views

Noob: 19v power supply without IEC (kettle) lead

In terms of specs, I was after something like this external power supply But i'd like to put it inside an enclosure for a DIY project. I'd prefer a smaller cable connector at the male end, ...
0
votes
1answer
64 views

how to charge two 18650 3.7v batteries?

i have two 18650 batteries of this type (but with one 1500mAh and one 2000mAh) and i need to charge them with two (or more if needed) 6v 1A solar panels. I was looking around and found this but this ...
0
votes
2answers
85 views

Building a solar phone charger, how does a solar panel charge batteries and what voltage should the panel and the batteries be?

I am new to electronics, please don't mind mistakes Right now i have a 5v solar panel, and a 3.7v battery,and i plan on buying step up converter from 0-9-5v to 5v. I have an iphone 6 with the new ...
0
votes
1answer
43 views

Large load connected to small solar panel and battery

I have a smaller solar panel (say 12v, 0.5 amp and therefore 6 watts) connected to a 12v car battery (assume lead-acid) directly though with the included blocking diode, there is no charge IC ...
0
votes
2answers
57 views

Does a battery charger limit current?

I am asking if the battery needs a specific amount of current to charge and I tried to charge it throw a charging circuit (which is designed for the battery), will it limit the current so it will be ...
-6
votes
0answers
36 views

Dual line (Two pwer supply) circuit with invertible amplifier [duplicate]

Am trying to change my circuit and make it one power source instead of two. The circuit is called dual line circuit for flexi-force sensor.This circuit has invertiable amplifier that works a series ...
0
votes
1answer
37 views

Charging battery

I have a NiCad battery that I got from an old rc car. I have some trouble charging it. the battery is rated 6v and the charger's voltage is rated 7.25 (why is it bigger)? however, I measured the ...
0
votes
1answer
64 views

Difference between controlled current and constant voltage charging

Modern charging of lithium and nickel based batteries starts with a constant current, until a certain voltage and then a constant voltage until the current falls to some level that indicates end of ...
1
vote
3answers
254 views

Charging a 12V car battery from a stream [closed]

EDIT: Thanks to everybody for replies and comments, which have been most useful. It seems that the hydro side of the equation would be challenging to implement, given the issues with sufficient head, ...
-1
votes
0answers
27 views

Conditions for charging 3 AAA LR03 NiMH batteries interruptedly

I have to charge 3 AAA LR03 1.2V NiMH batteries in series with the power input from random 5 second charges every hour or so (But three or four of these charges can happen in a short span after an ...
0
votes
2answers
59 views

Charging lead acid battery using boost/buck converter

I plan on permanently connecting a 12v lead acid battery to my home made wind turbine (dc). I already have a dc-dc buck/boost converter so I wonder if i can use that to charge the battery. ...
0
votes
0answers
28 views

Balancing lithium iron phosphate / Charge in parallel and discharge in series

I'm trying to make my current project charge with a more convenient barrel connector charger. This also means I want to keep the charger as small as possible. So the packs are wired in parallel to ...
0
votes
1answer
31 views

Specifications for a charger needed to charge LiFePo4

I have a project with three 4-Cell LiFePo4 batteries. The battery specs: 4S at 3.3V 4200mah 30C I want to charge all 3 batteries in a range of 45 - 75 min (Preferably one hour) What are the ...
0
votes
1answer
66 views

How to build your own 12V lipo charger

I bought a couple ~12V lipo batteries, which internally are 3x3.7V cells wired in series with a balancing circuit. It includes its own charger, and it seems to work well, but it only provides 500mA ...
1
vote
2answers
157 views

controller circuit for charging 12V 7AH Lead Acid battery from main source and Solar source

I need to have a controller for charging a 12V 7AH battery and provide uninterrupted supply. The source for charging would be 12VDC from a PSU or if there is a failure in that from a solar panel. I ...
0
votes
2answers
80 views

Why Exactly Car Charger Stop When Car Is Off?

Just out of curiosity, I'm wondering why car chargers can provide no power when the car is off in most cars. Is it because the electrical system that connects to the car chargers is running off the ...
0
votes
0answers
38 views

Limiting Tablet Battery Charge By Limiting Available Voltage

I have an Android tablet. But I don't use it very often. So sometimes, after a full charge it may not be used for up to a month. And it is bad to store LIPO batteries fully charged. So I want to stop ...
0
votes
2answers
47 views

Charging two 12V lead-acid series batteries separately with one 12V solar panel

I am working on a senior design project and just wanted to ensure the following charge configuration would work. I have a 12V solar panel that I plan to run its' output to TWO separate PWM solar ...
0
votes
1answer
52 views

4s2p lithium ion battery charging from USB

I am newby in electronics. I planning to design a 4s2p (3.7 V, 3000mAh) li-ion battery pack and a charger. I want to use TI BQ series (BQ24618) ICs for charging. I know we can charge battery pack ...
0
votes
1answer
48 views

Overcharge Lithium-Ion when using charge controller + Arduino Load

I'm trying to determine if I need to rethink my circuit for a solar + Li-Ion powered Arduino. Basically a solar powered module with 3.7V Li-Ion backup for night / clouds (to be charged during the ...
-6
votes
3answers
81 views

plugging battery against the power supply [closed]

This may come across as a rather nonsensical question however I think it is worth asking simply to understand what happened. I plugged in an electric car battery directly to a wall socket, almost ...
0
votes
1answer
54 views

Battery charging time

I have a 4V 1.5A battery using it for led lights. What time it will take to charge full? Or on what factor this charging time depends? And how to calculate this
1
vote
3answers
77 views

What is a good voltage regulator or voltage regulating circuit for my micro-USB battery charging needs? [closed]

I have a need for a voltage regulator such that I can use it to down-convert 5V USB to about 3.3V in order to charge a lithium battery. Ideally: Assuming some users may have a faulty micro USB input ...
1
vote
2answers
35 views

difference in charging battery of different Ah

Can i use a lower Ah battery charger(say 20,30)to charge a higher Ah battery ie 110Ah?What are the consequences? What is the difference in the charger circuit in both case?
0
votes
2answers
63 views

Can a 6V rechargeable battery be charged to 5V after complete discharge?

I live in a area where there is power cut. I have to power a Raspberry Pi (a device rated as 5V and 300-700mA) through micro USB continuously. So I decided to make my own mini inverter. Now I have a ...
0
votes
2answers
48 views

Do I need special charger for a Lithium Ion Battery?

I want to use a Lithium Ion Battery but I saw that there is also a differente kind of chargers like Adafruit Micro Lipo/MicroUSB or Adafruit Micro USB Lipo for this kind of battery, do I need it? ...
0
votes
1answer
36 views

Paralel charging two Lithium Polymer batteries on a MP3 player Colorfly C4

Is it a good idea to replace a built in lithium polymer battery rated: 3.7 V, 2000 mah with TWO x brand new 3.7 V, 1800 mah ...
0
votes
1answer
67 views

Is it possible and safe to freeze rechargeable NiMH batteries to revive them?

I have a couple of rechargeable AA NiMH batteries that I can no longer charge. After the charger claims the batteries have been charged fully they still output 0 Volt. I found some posts that claim ...