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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31 views

Effective power circuit for currents up to 1.5A and with battery charger (PMIC or not to PMIC?)

For my ARM-based (A10) device I need to create power circuit. Input voltages: 5-28V, may be charging from USB. Output voltages: 5V, 3.3V, 1.2V, maximum output current -- up to 1500mA, working current ...
0
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0answers
21 views

What depth of discharge does 0% on a UPS correspond to? [on hold]

When a UPS like an APC Smart-UPS shows 0% charge remaining, does it mean the deep-cycle batteries are completely discharged or that they're at 20%?
0
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0answers
28 views

Automatically changing currently used and charged deep cycle batteries, any problem?

I don't know the internals of commercial solar deep cycle battery chargers, though mostly what I see in home made ones is that a regulator circuit is connected to battery, and when you want to use the ...
0
votes
1answer
38 views

Lengthen charge times with batteries

Would replacing a 3.7v 1000mAh lithium ion battery with a 3.7v 5000mAh lithium ion batter make my projects last longer between charges?
1
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1answer
39 views

BQ2407x Li-Ion charging circuit, what if Vin is disconnected?

We will use a Texas Instruments BQ24072 in our power board to monitor the battery. -PoE or solar will charge -Most of the time, circuit will work on battery. When disconnection the Vin, one would ...
2
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3answers
87 views

How do USB charging and “smart” charging ports (e.g. Anker's PowerIQ) work?

Software engineer with a hobbyist understanding of EE here. I've noticed lately lots of claims from producers of USB battery packs that their ports are "smart" and "identify the device" to "deliver ...
0
votes
1answer
39 views

Faster charging of Lithium Polymer battery possible?

I am designing a system which needs to run for 3 minutes, then charge as quickly as possible, then run for 3 minutes, then charge as quickly as possible, and so on. In order to reduce the charging ...
0
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0answers
26 views

Designing an Automated Switching System for Solar Battery Charging Station

I am trying to design an Automated Switching System for my Solar Battery Charging Station project. In the project a 48V battery rail is charged with two 200W panels connected in series through a PWM ...
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2answers
74 views

Why one transistor switches on first than other

In the circuit diagram given below we have two transistors. And in the article it is given that one transistor will turn on first. Why this transistor turns on first
2
votes
4answers
213 views

Need help explaining this circuit and how it is dimensioned and designed

I'm working on a project to school where I'm designing a battery charger with battery status indicator, and I found this circuit online: but to include it in the project, I must explain how it ...
2
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0answers
56 views

Li-ion battery calibration technique

As you know the li-ion batteries have flat voltage curve and it is not possible to detect battery state of charge (SOC) from voltage accurately. We use fual-guage which measures the accumulated ...
1
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2answers
72 views

How do phones charge their battery at seemingly any rate with no issues? 500mA or 1A or 1.2A depending on the charger?

If most use some sort of li-ion battery, and those batteries like to be charged in CCCV format how can my phone charge just fine at 5V, 500mA or 5V, 1A or 5V, 1.2A just fine (actual current delivered, ...
-1
votes
1answer
54 views

Charging battery using computer power supply?

I have new 600W ATX computer power supply unit. I have wired green and black together to make power supply turn on when plugged in. I wanted to charge my 12VDC empty battery, without dealing damage to ...
1
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2answers
83 views

Watts in Solar Panels

How does the amount of watts affect a solar array? The solar array I found is 14 W, so what would I encounter if I purchased an lower/higher wattage? I'm going to purchase an array to charge my ...
-1
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0answers
48 views

Would this be too inefficient to be viable (inductive charging)

So I wound up with a handful of miniature solar cells from a botched project and I was playing around with them. I happened to notice that three put side by side fit almost perfectly into an indention ...
-1
votes
1answer
70 views

What do B+ and C+ mean on the wires of a Lifepo4 battery pack?

I bought this Lifepo4 battery pack. It came with its own charger. The seller told me the charger can be connected directly to the battery. There are 4 cables coming out of the battery: C+, C-, B+ and ...
0
votes
1answer
65 views

How can I modify the charging circuit of the solar powered system using super-capacitor with or without battery (diagram is attached)?

I 'm working on a device which according to the below diagram, has a solar panel witch gives at most 10v voltage and 30mA current (average 9v and 20mA) and also it has a 6v lead acid dry battery with ...
0
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1answer
53 views

Solar panel & battery math verification

I'm looking for confirmation to see if this battery and this solar panel will cover my needs for a remote timelapse project I'm setting up. The timelapse will run 6 days a week for 9 hours. My area ...
0
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1answer
49 views

Can someone tell me if this topology for a crude battery charger is sound? Block diagram included

I am making a portable phone charging battery for fun. I have a micro USB input that ties to a 5V - 4.2V buck converter to charge a li-ion battery. The IC is made to charge batteries so I think that ...
2
votes
2answers
127 views

Effects of continous slow charge on a battery?

If you connect a solar panel to a phone battery, but the solar panel provides about 1/4 (or 25%) of charge (mA) compared to the battery's original charger. Will this slow power charge the battery ...
1
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2answers
94 views

DC-DC converter to drive DC motor

In a robotics application I have to install a 12V (30A) DC motor actuator in a vehicle. The typical setup indicated by the manufacturer is to directly connect it to the battery, because of inrush ...
0
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0answers
39 views

Equations to charge a lead acid battery with constant voltage strategy

Typically there are 3 zones to charge a lead acid batteries.In the first step, the battery would be charged with a constant current and after a specific SOC, constant voltage strategy would be applied ...
2
votes
1answer
121 views

Temporary, high-power energy storage

I'm currently building a small, portable human-powered charger for supplying a 1W led. I salvaged a dynamo core from a torch, but I'm unable to use other components inside since the torch is only ...
3
votes
2answers
76 views

How does this shunt regulator work?

I'm investigating battery monitors and I'm looking at TI's BQ76930 to take care of an 8 cell 24V LiIon. They provide the datasheet for their evaluation module (PDF warning) which includes the board ...
3
votes
1answer
54 views

Charge a Lipo with only Constant-Current Stage?

I'm following this standard algorithm: http://batteryuniversity.com/learn/article/charging_lithium_ion_batteries Algorithm for charging LI-PO batteries? but am wondering if I can get ~80% of the ...
1
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0answers
50 views

Rechargeable battery with a photovoltaic switch

I did some searching around on the forum but with absolutely no electrical background, I have exhausted my searching and hope I can explain my issue. What am I trying to do? I have a solar panel and ...
2
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1answer
101 views

Charging High Cell LiPo batteries

I have a question about charging and balancing a 10-12 cell LIPO battery. I have been searching around for an all in one solution chip but come up empty. I have also found out that there are almost ...
0
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1answer
60 views

Efficient high amplitude current regulation, so I don't end up being sad

I have an unstable power source 0-10V (I don't actually know if it can drop to 0) from solar panels and I want to boost and stabilize it to charge 19V 2.1A laptop and a 12V 12Ah battery. I've already ...
0
votes
1answer
91 views

Is it OK to trickle charge a disposable battery [duplicate]

So I am playing around with designing a UPS when another question hit me. If I have a source feeding a small amount of current into a non-rechargeable battery is this OK. By OK, I mean is this ...
0
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2answers
172 views

Are AA battery and 18650 battery the same? [closed]

I have an Antex SZ004W0 wireless soldering Iron which uses three 1.5V, AA batteries, but I don't know if it supports rechargeable batteries. I know that it supports non-rechargeable battery named ...
0
votes
2answers
129 views

How do I make a circuit that charges two 3.7 Li-Ion batteries (in series) with a 5v input?

I want to make an Arduino wristwatch that can be wirelessly charged by inductive charging. The two 3.7v Lithium Ion button cells are hooked up in series (to make around 7.4v) which powers my Arduino ...
1
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1answer
108 views

How efficient is wireless electricity compared to wired electricity?

I am looking for data showing practical data/information on the efficiency of wireless (induction) transfer of electricity vs. wired transfer. There is some information out there but the source makes ...
0
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4answers
273 views

Why does my DIY “solar panel circuit” show battery voltage and not solar panel voltage?

I've got two solar panels set up in series as shown on the below schema. I connect positive on panel A to positive on battery, and negative on panel B to negative on battery. The two panels produce 9V ...
2
votes
2answers
134 views

Battery charging and discharging problem

I have designed a battery charging and discharging circuit. The main purpose of this circuit is to charge the battery and then discharge, one operation at a time. I have also added a hysteresis of ...
2
votes
2answers
111 views

How to store the electric energy produced by solar panels properly?

I am building some solar panels from 6" cells (4W, 0.5V, 8A). At the moment I have two 1x2 panels and one 2x2 panel. So there are 8 cells in all panels and the added voltage is up to 4V. Now I want ...
2
votes
2answers
134 views

Ni-Cd battery is not working properly [closed]

I have a Ni-Cd battery (8AA) 700 mAh 9.6 V, taken from an RC car. However, is no longer capable of powering up sufficiently the RC car. Specifically, servo works fine but motor can't spin. Instead, ...
0
votes
1answer
55 views

Lead-acid battery charging [closed]

Have an unbranded lead-acid battery charger and a small 6Ah 12V battery. After about a year of purchasing the set I need to charge it for the first time. For car battery jump start I vaguely remember ...
1
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1answer
309 views

Calculating battery percentage using an Arduino

I'm doing a little project using a Lipoly charger and a 2500mAh 3.7V battery, both from Adafruit. I'm trying to display the percentage left on the battery. For that I'm using this little sketch : ...
2
votes
1answer
83 views

LiPo use while charging: two cells (one charging, one under load)

I'm trying to figure out how to power my project using LiPo batteries and a solar charging circuit. The project will draw up to 2A at 3.3V. I did a search for IC LiPo charging chips that also allow ...
2
votes
1answer
99 views

Combine 2 circuits to get the best of both? Battery management system

I'm working on a battery management system for 2 12V batteries in series, totalling 24V, and I found this very good blog online with 2 circuits that got me very interested: This one, that got me for ...
0
votes
1answer
81 views

Bus and self powered device using FTDI FT230X

I'm trying to wire up my first device using an FTDI USB to Serial converter. FTDI recommends not mixing bus and self powered designs. But they also mention that it's possible in the documentation. My ...
0
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0answers
34 views

Can a device requiring a 18v 2a DC wallwart, take a charge from my spare 19v 2a DC charger? [duplicate]

Can a device requiring a 18v 2a DC wallwart, take a charge from my spare 19v 2a DC charger? Just worried about that extra volt. Is it significant enough to damage the device or will I be fine?
0
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3answers
159 views

What should be the cut-off voltage for charging Lead ACid batteries through PV Panel

My Solar charge controller allows me to set a cut-off voltage, so that the battery charging is stopped when the battery reaches that voltage. The value I set will probably also be the maximum voltage ...
3
votes
2answers
393 views

How do I avoid overcharging a battery?

I've got a solar panel (12V, 330mA, 2W) which I will use to charge a (12V 5Ah) lead acid battery. I'll put a voltage regulator and shottky diode in between the two. However, could overcharging become ...
1
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3answers
139 views

Can be lead-acid battery charged using NiMH or NiCd charger?

I would like to check total capacity of 64Ah lead "car battery" ^ by fully charging it and currently I have only older intelligent charger (Robbe Power Peak 8467 – page can be switched to ...
3
votes
2answers
108 views

Is it safer to use a power supply that isn't high amps?

I have heard about batteries going into flames when left charging too long. And no doubt that can happen with a power supply that supplies just enough amps. Is it possible for a battery to be badly ...
1
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4answers
92 views

Current limiter for NiMH battery charger

I am trying to learn about electronics by making my own MCU controlled battery charger for standard AA 1.2V NiMH and NiCd batteries. The supply voltage is 5V from a USB battery pack. I did a lot of ...
9
votes
4answers
384 views

Battery chargers that can recharge disposable batteries. How do they work and are they safe?

A few years ago a product called SecondWind appeared, which claimed that it could recharge disposable batteries. To a layman like me that sounded like a great idea, but does such a product really ...
1
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2answers
104 views

Designing effective usage time from 12v car battery

Need a little power design help: I have a project I'm working on where I have measured that I will use approximately 14.4Ah over 24 hours. This is quite the load for a small timelapse setup where I ...
0
votes
2answers
95 views

Documentation on Apple's USB Chargers? [closed]

I'm worried if someone charges my single-cell lipo with an Apple USB power supply that it'll get damaged. Is there documentation on Apple's USB chargers? I'm imagining I want to be able to support ...