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
47 views

Switching between two sources of power to a battery?

This is the simplified system: a battery (3.6 V, 2450 mAH, NiMH) a solar panel (max 5.2 V, 157 mA) a wall charger (5 V, 2100 mA). The battery is constantly being drained, but very slowly (85 mWh ...
0
votes
1answer
32 views

Charging NiMH batteries with 1W solar panel, charge controller needed?

I want to know if a charge controller would still be needed despite the solar panel never outputting more than C/10 of current to the battery. This is a follow-up about my question here. The solar ...
0
votes
1answer
27 views

IC for Trickle Charging vs. Fast Charging a NiMH rechargeable battery using solar and wall charger?

I want to use a solar panel to extend the use time of 3 NiMH AA's in series to power a microcontroller. The solar panel is rated at 1 W with a max load voltage of 6.4 V and the product page is here. ...
0
votes
0answers
6 views

What element is used to simulate rechargeable battery in proteus 8 suite?

I'm going to simulate a rechargeable battery.I want to show the increment in voltage across the rechargeable battery terminals.I don't know which element to use in PROTEUS 8 to do this ...
0
votes
1answer
30 views

Aspire Switch 10 USB Charger possible?

Hello there at Electrical Engineering SE, i am thinking about soldering a selfmade micro usb converter for my Acer Switch 10 tablet. After looking at the charger, i found out that it only needs 12 ...
-1
votes
0answers
20 views

How to charge a phone slowly with a boost converter [on hold]

I have a super capacitor that charges slowly to 5 volts from 0 volts. Once it's charged to 5V, I would like charge a phone until all the voltage is drawn. Then wait super capacitor charge to 5 voltage ...
1
vote
0answers
42 views

Cooling the IC on a board printed by hand

I'm building a battery charger circuit with BQ24278. The battery draws 500mA minimum and 2.5A maximum current; therefore, I must prevent IC from overheating. I printed the board onto single sided ...
0
votes
0answers
65 views

Charging a cell phone [closed]

folks: I wish I understood electricity better, but I don't, so I hope you'll help me. My cell phone says it's 3.7v, 800mA. The battery in it is 1000mA. The charger I ordered for it (which claims to ...
0
votes
1answer
61 views

Li-Ion charging ic with 5V input and battery voltage between 3.9V and 3.6V [closed]

I am currently in search for a battery charging ic that has a variable output voltage (so that I can set it to 3.6V to 3.9V) or a fixed range, similar to what I would like to have. But why would I ...
-3
votes
2answers
82 views

Hybrid cars - are they good [closed]

I hope this is not too much outside this forum, but... Up to now - and recently more frequently, I see advertising and promising talk about the new breed of hybrid cars and all-electrical cars (like ...
0
votes
1answer
68 views

Why are capacitors used in battery chargers [duplicate]

I'm looking at this IC: link here And noticed under "typical application" a simple circuit diagram. What is the purpose of the capacitor that connects Vin directly to ground? How does this affect ...
1
vote
3answers
62 views

connect series of batteries in parallel?

I have eight sealed lead–acid batteries connected to my photovoltaic array in the way you can see in the image below. A friend told me, that it was a bad idea to put those light-green cables in the ...
1
vote
1answer
32 views

What are the main considerations for a battery operated project [closed]

I just wanted to know what are the major considerations to be taken into account while designing a battery operated project. What are the major optimizations to be done in order to improve battery ...
0
votes
0answers
25 views

Charging multiple, high capacity lipo packs in parallel?

I'm currently working on the power system for a moderately sized wheeled robot (used to be powered by 3 7.2Ah SLA batteries in parallel.) These are all beyond dead, but rather than just replace them ...
-5
votes
0answers
48 views

under charged battery voltages [closed]

i am trying to make an auto battery charger. it starts charging when battery voltage drops below 12, and will cut-off charging voltage supply(which is 15v Dc) when the battery voltage reaches ...
-1
votes
2answers
71 views

Would replacing a 35 Ah battery with a 100 Ah battery damage the alternator?

I have an Elemax SH7600ex generator that came with a 35 Ah battery for the electric start system. That battery has died, and I've replaced it with a 100 Ah battery that I had lying around. The ...
-1
votes
1answer
46 views

Fast rising voltage on lead acid battery while charging

i have a couple of 12V sealed lead-acid batteries.Whitch i have to charge.But when i hook one of them on the charger at 12V/1A (the battery is 10Ah) the voltage from 12.6 drasticly increases up to 14V ...
0
votes
1answer
33 views

Pedal charged and pedal powered mountain bike

Pedal charged and pedal powered mountain bike... couldn't this be easily accomplished with just one DC Brushless motor or would two motors be needed? I've seen plenty of electric powered bikes. Take ...
1
vote
1answer
139 views

Solar controller with BJT transistor and PIC24 microcontroller to charge 3.6V NiMH batteries

I'm designing a solar controller circuit and am having some confusion about how to switch the BJT on and off. I have a single solar panel charging a battery. The BJT is there to prevent over-charging ...
0
votes
0answers
26 views

Finish of charging

Is it possible to determine the fact charger has finished it's work (accumulator unplugged or charged) by any metrics in AC circuit? History of metrics is also available. Can this be resolved in ...
1
vote
2answers
92 views

How to autoregulate a TP4056 for maximum solar power extraction

I'm using a solar panel (6V - 600mA at peak power) to charge a Li-Ion (3.7V) battery using a TP4065. The TP4065 I'm using has this configuration: Where the value of the resistor Rprog determines ...
1
vote
3answers
244 views

Automatic LED emergency lamp circuit with overcharge protection for 12v lead-acid battery

I am a newbie in the field of electronics.So please help me with my questions. I am trying to implement this circuit below. I have a 9-0-9 centre tapped transformer. Then how to change the circuit ...
0
votes
2answers
65 views

I have virtually no understanding of how batteries work and charge, and have various questions on them

I'm doing research into portable power generators for a university class and need help understanding how charging a device works. From my research, I've found certain methods of harvesting energy can ...
0
votes
3answers
66 views

Charge 48V battery bank with 12V

I have a 48V battery bank made up of 4 deep cycle 12V batteries in series. My charger only has 12V and 24V options. I've considered using relays to put the batteries in parallel and charging at 12V. ...
0
votes
1answer
85 views

How long will my battery last under this load and with this source?

I need to calculate how long my battery will last until it is completely discharged. I have a load that will draw 154 uA at 1.8 V for a power of 277.2 mW. Assuming that this is running indefinitely ...
0
votes
2answers
79 views

Charging a battery with two sources, should I put them in series or parallel?

I would like to charge a battery using two sources (solar and a generator), should I put the two sources in series or parallel before the battery? The battery is actually 3 batteries in series. Each ...
2
votes
1answer
101 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
67 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 ...
1
vote
2answers
108 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
56 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
2answers
86 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, ...
-1
votes
2answers
86 views

Can I charge a Lead Acid Battery with a Lithium Ion Battery Charger [closed]

Can I use a charger meant for lithium ion batteries (eg a charger for a drill) to charge a lead acid car battery. It charges at 14.4V which is what I'm looking for (and will limit to 2Ah with ...
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
92 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
1answer
71 views

My attempt at designing a ripple regulator - will this work?

I am recently getting into electronics design and learning about all this fascinating stuff. I wanted to challenge myself to build a ripple regulator that can take the output from a series of solar ...
0
votes
1answer
57 views

MCP73833 suitable for charging battery and system at the same time?

I saw a schematic for the "USB LiIon/LiPoly charger - v1.2" by Adafruit. The schematic is shown below. After reading the data sheet I am uncertain if the MCP73833 Charge Management Controller chip is ...
-1
votes
1answer
50 views

Li-ion Battery charging process [closed]

Why are constant current mode and constant voltage mode needed when charging Li-ion batteries? Why do we apply saturation charge even after the cell voltage reaches 4.2V? What exactly is 'I-sense' ...
0
votes
0answers
73 views

Solar project design - solar-panel, battery bank and charge controller

For a project that has following requirements, can someone please explain how I can arrive at the size of solar panel and battery bank that meets the requirement: Scenario-1: 5VDC, 4A continuous ...
0
votes
2answers
100 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. ...
4
votes
2answers
217 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, ...
0
votes
2answers
402 views

How do i build a battery charge circuit that doesnt require the battery to be disconnected

I am needing some advise on how to build a circuit that can charge a 9v rechargable whilst it is still connected to my small robot. The battery will power an arduino, meastro, 4 std servos and 2 dc ...
0
votes
2answers
89 views

Wrong behavior li-ion battery charger

I followed this tutorial to build a li-ion battery charger circuit, I made two circuits (the last one better than the first), but any of them works as expected. Schematics (I copied from the page ...
1
vote
1answer
71 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 ...
1
vote
0answers
52 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? ...
2
votes
1answer
104 views

How does this battery simulator work?

I'm trying to understand how the battery simulator circuit described in the Linear Technologies Application Note 58 works. Its schematic diagram from Appendix B, page 35 is below. The application ...
3
votes
2answers
97 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 ...
3
votes
3answers
256 views

If I were to discharge, recharge, discharge, recharge,…, an electronic equipment, would there be any negative effects?

Would there be any damage to a laptop or another electronic equipment if I use the internal battery supply till it has been completely depleted, then I recharge it to maximum, then wait for it to ...
1
vote
1answer
166 views

Arduino and N mosfet lithium battery charging/discharging measuring capacity

I need an Arduino based lithium battery tester that uses N channel Mosfets to switch On charging from and external power source and discharging through a 2 Ohm resistor. I have no issues with either ...
0
votes
1answer
66 views

Measuring the charge of a battery while charging

Determining whether a 12V car battery needs charge is as easy as touching its leads to those of a multimeter. While charging from a vehicle's alternator, the multimeter method fails to determine the ...
0
votes
2answers
80 views

Charging li-ion batteries with protection circuit

If i'm using a protection circuit like this one: http://www.batteryspace.com/pcbfor148vli-ionbatterypack5alimitwithfuelguagesocket.aspx and 4, 3.7v li-ion batteries. Can I use a simple 16.8v dc ...