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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17 views

2S LiPo Charger IC With Built-In Boost (allowing 5V voltage supply)

So before I get to my question, I wanted to give a bit of background info on what I am working with. Basically I have a device which is USB powered. It has an ATMega32u4, and two SN754410 H-Bridge ...
0
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0answers
25 views

Push-button PMIC & Battery Charger [on hold]

I am looking for an IC that combines Push-button power management with a Single cell LiPo charger (USB source). The IC should have a push-button input to turn the system ON, as well as a PB output ...
0
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1answer
49 views

Charging a battery with more mA than its genuine charger

I recently bought a compact digital camera and it came with a charger of 5V, 1A output. This is a wall charger and the cable is USB type as in android smartphones. I have another wall charger which ...
-2
votes
1answer
45 views

Is there a rightside up when plugging in an AC to DC power converter? [on hold]

When plugging an AC to DC converter into an AC outlet, does it make any difference at all if the wall wort is "upside down" or "rightside up"? Is there anything about the electrical design that would ...
0
votes
3answers
49 views

What is the optimal battery charging speed?

I have 3.7V 4000mAh Li-ion battery. I also have 0-30V/6A power supply which can limit output current. Provided that I charge the battery with voltage limited to 4.2V, I can change the maximum current ...
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2answers
44 views

How to make USB smartphone charger? [duplicate]

I want to make a USB cell phone charger. I know USB operates in 5 volts which means i need to drop down voltage if i have battery potential greater than 5 Volts. I have 12 volts sealed lead acid ...
0
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0answers
13 views

Using STNS01 with an Unprotected Lithium Ion Battery

In place of using a lithium ion battery with a built in protection circuit, I was planning on using a 500mAh unprotected cell with the STNS01. The internal circuitry is basically the same as any ...
0
votes
1answer
37 views

Charging a 36V battery set with a 255W solar panel

I have directly connected a 255W solar panel (with Vmpp of 49.5V but can peak at 56V in full sun at mid-day) to the 36V battery set of my golf cart. This seems to have been working fine for months, ...
1
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1answer
58 views

Will a diode conduct if one side is floating and one side has voltage applied to it?

I have a circuit that has a battery output voltage of about 7V and can also have a charger input that when plugged in will output around 9V. The battery/charger power a microcontroller (regulated ...
1
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2answers
49 views

How can the SparkFun Lipo USB charger power other devices at the same time as charging?

How is this SparkFun charger capable of charging a LiPo at the same time as powering other devices? The Set up would look like this: This is what the schematic looks like. Basically, my confusion ...
-1
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1answer
37 views

Summer camp project questions - bike charger

For a summer camp, I am building a bike-generator. Well I have found a few articles about that on the internet, but I have put together a list of questions and I would be really appreciated if someone ...
0
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1answer
53 views

pulse charging lead acid battries effects and side effects

I am developing a solar charger which charges lead acid batteries.I would like to clear a few of doubts on this issue. I am using IR2110 gate driver for driving 2 n-channel mosfets in an half bridge ...
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0answers
44 views

Li-ion Rechargeable Battery maximum pulse charging current

Having a Li-ion Rechargeable Battery, giving a smoothe 1.9A current (nominal average current) requires me to have high inductance in buck filter or in my battery balancing system. Instead I can use a ...
0
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1answer
26 views

Charging two batteries with one solar panel

I have two batteries connected in series. However, I'm using it to separately get +12V supply and -12V supply. I have a 24V rated solar panel, and was wondering if it's possible to charge the two ...
0
votes
1answer
40 views

Solar Panel Charging with Arduino

I built a solar panel charge controller from instructables with an easy to read schematic and for some reason my battery charges up to a certain point and then loses charge again. That leads me to ask ...
0
votes
3answers
63 views

How many 115ah wet lead acid batteries are safe to charge in the same space?

We are using about 10 115ah wet lead acid batteries to provide electricity for our business in the field. At night, we charge them all in the same space. The space does have a bit of airflow, but it's ...
0
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0answers
43 views

Driving the floating power MOSFETs

In a battery balancing system, I have four transistors and some of them are floating as you can see in this circuit: There are four battery packs each made of two batteries (Li-Ion) and charged via ...
0
votes
2answers
44 views

Solar Cell to DC-DC converter to Li-Ion charing module, is the DC-DC converter necessary?

I have the following components: 1W Solar Cell (5V at 200mA): http://www.ebay.ca/itm/291435192356 DC-DC Converter (2.5V Vin_min, set to 5V Vout): http://www.ebay.ca/itm/200983543561 5V Lithium Ion ...
0
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0answers
27 views

Is slowly charging a battery extending the lifetime? -why

Is slowly charging (like usb: 500mA) a battery of a cellphone/ tablet/ notebook increasing the overall lifetime of the battery itself? If yes: why is it ? Why do LiIon batteries lose capacity over ...
0
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1answer
70 views

How to select power (between USB and battery)?

I'm hoping to power my device with a 3.7V (2x 18650) rechargeable battery which can be recharged within the device using USB (like in a phone, laptop, etc.). I believe some kind of power selector is ...
-1
votes
0answers
65 views

How can I charge an 18V drill battery off of a 12v solar system

I have a small solar setup that runs on 12v. I'm interested in charging my 18V drill battery. I do have a power inverter, so I can plug the drill charger into the power inverter, but my concern is ...
0
votes
1answer
30 views

Calculating rechargeable battery charging rate curve

I am trying to understand the rate of charge of a rechargeable battery - let's say, a Li-ion one. What I'm interested in, is to understand whether the charge (the "percentage" of the Ampere-hours the ...
0
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1answer
49 views

Solar Cell - Preventing overcharge of an NiMH battery

I am trying to design a circuit and was wondering how to design it that the 12V 800mAH NimH battery I am using will not overcharge. I have researched trickle charging and as far as I understand, a ...
0
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1answer
35 views

Solar battery charger with load sharing

I'm looking to design a circuit around the CN3065 that will be solar powered with a li-ion backup battery. I've seen circuits that can achieve this by using a charge controller with a dedicated load ...
0
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0answers
18 views

Cycling through batteries with intelligent charge controller

I have a 12v Intelligent Charge Controller (for sealed lead acid batteries) Below 8v the rapid charge kicks in Above 13.4v the pulse charge kicks in (trickle) I would like to find a circuit or ...
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2answers
31 views

Charging 4 protected li-ion batteries in series

I have bougth 4 protectected li-ion batteries from e-bay ...
0
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3answers
114 views

Using a regulator or not?

We have designed a board for mass production . This board has a few components on it, that works with 3v3 , such as MCU, Wi-Fi, and a few more sensors. We used to have a battery, 3.7v to power the ...
0
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1answer
54 views

Most efficient generator for charging 12 V batteries

I have a Honda GX25 mini 4-stroke engine that I want to built a battery charging generator for 12 V lead acid batteries. My first idea was to use an old car alternator as the generator part, but now ...
-1
votes
1answer
61 views

Why do laptops conduct electricity through the battery when they're plugged in and fully charged?

Electricity from an outlet goes through laptop batteries even when the battery is fully charged (to the best of my knowledge). This degrades the capacity of the battery (or so I've been told). It ...
-1
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0answers
61 views

Charging an SLA battery for storage in an automobile [migrated]

Whats the best way to maintain a 12v SLA battery in an automobile? Would a direct 12v connection to the vehicles battery system be sufficient, or is there a circuit that should be placed in between ...
1
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1answer
84 views

Can I alter this circuit?

I am making the following solar charge controller circuit based off of the NE555: This is the webpage I got the schematic from: http://mdpub.com/555Controller/ The potentiometers at the trigger ...
0
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2answers
50 views

How to compute the charge of a required battery if I know average power usage of device

I have a device that operates on average 0.6 watts. I want to design a battery that will leave this device on for 17 hours straight. I know that charge(Q) = current * time. My device has an ...
0
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1answer
162 views

Convert AC/DC power supply to current source for battery charging

I have an AC/DC power supply unit (400W) with the controlled output voltage (40V...60V). It would be great to use such a power supply as a current source to implement a dual step current changer. The ...
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0answers
18 views

3s Lipo parallel usb charging board

I'm building a vaporizer and I would like to use 2 of these batteries in parallel. I don't want to keep removing the batteries and charging them separately I would like to just charge it through a ...
0
votes
1answer
26 views

Linear Technology PMIC (LTC3566) - powering circuit entirely from VOUT1

I'm looking into Linear Technology's LTC3566 PMIC for an upcoming portable design. Its a really nice PMIC with a buck-boost regulator on-board. Here is the typical application: The reason I want to ...
1
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2answers
68 views

Two deep-cycle batteries connected in parallel by a single terminal

From what I understand, if two 12v batteries with different charge levels are connected in parallel with both terminals, the charges of the two batteries will even out. The one with the higher voltage ...
1
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1answer
41 views

Charging lithium polymer

I bought a mcp73812 charging ic from digikey and I found a circuit online. I don't know much about electronics but I feel like there are issues with the circuit: First of all it says the green led ...
0
votes
1answer
61 views

Charge battery when power up, use battery when power down

I have a tiny little esp8266 that runs happily on 3.3V and draws about 250mA and I can make it sleep and use very little battery power at all. What I want to do is use supplied power when possible ...
0
votes
2answers
88 views

PID Control implementation for charging battery really necessary?

If one is to make a battery charger, lets say a Li-Ion battery charger (using a micro-controller with buck converter), is it necessary to do some kind of control implementation inside the ...
2
votes
1answer
58 views

How to monitor voltage and charge status in USB battery pack

What's the easiest, least intrusive way to monitor voltage, charging status, and remaining charge of a USB battery pack? Battery packs and charging circuits for mobile projects can be complicated and ...
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votes
2answers
56 views

external battery claimed iPhone 6 charges versus my calculated charges mAh vs Wh and voltage step down confusion

I did a charge on this page and could not find the answer I was looking for. Perhaps it was over my head, or perhaps I was using the wrong search terms, so here goes nothing: I am trying to ...
0
votes
1answer
32 views

LiFePO4 Batteries Discharge Fast After Recharge

On my application I have four 200 mAh LiFePo4 cells, configures as sereies of two parallels, thus achieveing a 6.4V battery. I understand this cells in series need balancing, I would like to leave ...
0
votes
1answer
110 views

How to increase watts ? out of 12 volt?

I am making a project, a DIY so please co-operate I don't know much about electronics the overall project needs some electric combinations... I have a rechargeable fan with built-in battery but I am ...
0
votes
2answers
57 views

Simple way to charge 5 x AA via USB - any off-the-shelf component for that?

I need to power a gadget I am building with 5 x AA batteries (6V), but I also want to be able to recharge it via USB (5V) while the gadget is on (that is, I want to be able to plug and unplug the USB ...
0
votes
1answer
73 views

Makeshift way to drain a battery?

I have a 3.8V mobile-phone battery that I need to discharge. However I don't have any electrical components (say led) with me. What is a crude way to do this using household items?
0
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0answers
37 views

Solar battery charger using MPPT?

I am designing a solar-powered battery charger, but I am currently having a problem with it. Here's the battery specs: 1.2V, NiMH, 2300mAh I'v read online that the safest way to charge a NiMh battery ...
3
votes
1answer
104 views

How to make 5V 650 mA on a summer camp?

On our summer scouts camp, I need to power a tablet (it simulates the computer from The Lost, and the children must activate it every 108 minutes). It requires 4.3 - 5.3 V and about 650 mA. I need to ...
1
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2answers
95 views

If Li-Ion battery is deeply discharged, is it harmful for it to remain in this state unused?

It is well known that Li-Ion batteries should not be deep discharged. But sometimes they do discharge deeply. Is it OK for the device to remain in such state for a long time (and recharge again only ...
0
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0answers
48 views

Battery charging via Buck or LDO?

I am supposed to charge a Li-Ion battery (12V 50Ah) and then discharge it over a period of time for testing purpose to measure its efficiency. And this charging and discharging is to be done using ...
2
votes
0answers
93 views

Creating a battery backup unit

I live in a area with frequent power failures lasting up to 5 hours. During this time I would like to power my router so that I can still use the internet with my phone/PC. I've looked at UPS ...