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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1answer
26 views

Why do laptop batteries and chargers differ in voltage output?

As an example, my laptop's charger gives out 19,5V and 3.42Ah while it's battery gives out 11,1V and 2.2Ah, what's going on exactly?
0
votes
1answer
22 views

Questions about circuit diagram, Lipo charger

Circuit diagram from here I've asked couple of questions about PS and Chargers, I keep facing new issues using the diagram above "an automatic lipo charger, sort of",why would the zener diode ...
0
votes
1answer
21 views

Capacitor Battery Charge Circuitry

Just a forewarning I am a complete rookie when it comes to capacitors I am looking to supply a 0.5mV charge into a capacitor, then have the capacitor discharge to a battery once the accumulated ...
2
votes
3answers
69 views

How to gauge safety of cheap Lipo batteries?

I see a ton of cheap 12V lipo batteries for sale on Ebay, but other than the mAh rating, I can't find any info or datasheets on how to safely operate them. I'm looking for a good battery to power a ...
0
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0answers
14 views

Shifting of battery in BMS

I was working over the topic Battery management system where now I have encountered a problem due to lack of proper knowledge in this field. My Problem statement is to achieve an uninterrupted power ...
1
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2answers
28 views

charging an auto battery for a gate opener?

Commercial gate opening systems use solar recharging systems frequently. My location is inappropriate for solar but is right next to a small stream. What properties of a mini hydro generation would be ...
0
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0answers
39 views

Switch based on battery voltages

I have two batteries. I would like a circuit which looks at their voltage, and puts them in parallel if they are the same. If they are not the same, the one with the higher voltage should be taken out ...
0
votes
1answer
24 views

Charging small capacity battery

I have a questions regardin charging batteries. I have a Li-ion, 3.6V, 150 mAh battery and I am looking for a suitable charger. Unfortunately I was not able to find a compatible charger. The ones I ...
1
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0answers
18 views

Determine lead acid battery safe float charge level for a range of state-of-charge

My question: I want to know how to determine the highest safe voltage for a given SoC (state-of-charge). Or for a given float charge voltage, determine the lowest safe SoC. Helpful hints to the ...
0
votes
1answer
27 views

Selection of charge controller to charge Lithium Ion battery

I have a DC generator with an output voltage of 27.5 Volts and current of 102 Amps. I need to use this charge my 24V 100Ah Lithium ion battery. So, I need to put a charge controller in between to ...
0
votes
1answer
25 views

Charging questions, current limitation and voltage

I'm having few issues with chargers, current delivered to a device etc... just need to connect the dots I guess. When I connect a phone to a charger for example IPhone which is rated at (5v,1A max), ...
1
vote
1answer
65 views

What do I need to trickle charge rechargable batteries with a solar panel

Hi I have a chicken coop door opener that is battery operated. The batteries tend to run down every other month even though the thing is basically just a digital alarm clock with a stepper motor ...
1
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0answers
55 views

What's wrong with this LiPo battery?

I have an 11.1v LiPo battery that has be working just fine and it recently dropped to 8.3 volts as it normally does during use. However this time when I plugged it into the charger the charger started ...
0
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0answers
18 views

Circuit for charge mobile phone by other mobile phone battery [closed]

I have 3 to 4 mobile phone battery which I connected it in parallel. Now when I try to charge my mobile phone then instead of charging mobile phone battery discharging may be because of reverse flow ...
4
votes
2answers
67 views

Heating a li-ion battery for use in sub-zero temperatures

I have a design that I'm working on that is to be outdoors year round, with a 1 watt solar panel trickle charging a 6 Ah li-ion battery during the day. I expect there to be about 3 to 4 months of ...
0
votes
1answer
29 views

Solar: Reason For Joining Batteries/Solar Panels in Series

I understand the concept of what happens when you do, but I do not understand the reason behind why some set-up require to double the voltage on the batteries, since the point is to store as much AH ...
1
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2answers
27 views

Understanding Battery Controller

I'm thinking of doing a small-scale Solar off-grid setup 1-2 80 Watt panels with a 12v 40Ah Deep Cycle battery. I have questions for those parts in another thread, but for now, my question is about ...
0
votes
1answer
31 views

Reviving an overdischarged NiCd 12v battery

Some time ago I recovered a 12v 1700mAH Ni-CD battery from an ancient Commodore Amiga black and white display laptop. The laptop works perfectly when powered by a 1.5a 12v adapter, but unfortunately ...
0
votes
1answer
39 views

USB charger with power bank charged from solar panel and peltiers

I would like to charge some batteries (maybe 1 lipo?) from either a 12V solar panel (about 300mA) or 2 peltiers (also about 200-300mA) in series (about 4V, but it’s really unstable and voltage changes ...
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1answer
47 views

TA/USB battery charging

Apologize if the question seems silly, searched for the answers on google but couldn't get an answer, so please manage to help. I am studying detailed charging process of a smartphone ...
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0answers
22 views

How to rewire a 6-port usb charging hub

For a project in school I am building a product which displays and charges any device which can run from a usb port. The problem is that I have the holes for the usb ports cut out of custom positions ...
1
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0answers
16 views

Is it possible to charge car battery through cigar lighter socket? [migrated]

I plan to modify my SUV into a camping car. Can I charge my car battery through cigar lighter socket with a 13.6 voltage when my engine is off? Also, can I power the air conditioning compressor and ...
0
votes
1answer
34 views

Lead Acid Battery [closed]

Hi so I was taking apart this old machine and found a 6v lead acid battery. I don't know lead acid batteries and I measured the voltage to be at 200mV. Now I'm pretty sure that this is bad and I don't ...
1
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1answer
34 views

Charging Lead Acid Battery from dynamo

I want to build a Lead acid battery charger. for that I want to use a small IC engine coupled to a dynamo and the dynamo I got is rated at 12V, 35A and I want to charge 12V 7.5 Ah Lead Acid battery. ...
0
votes
1answer
37 views

Operation of a micro USB phone charger outside its limits

Many micro USB phone chargers give 5V DC and 1500 mA output at input 100-240 V AC at 50-60 Hz (these values are from a Sony EP 880 charger). What happens to the output when voltage rises above 240 and ...
1
vote
1answer
61 views

How to design a Lithium-Ion battery pack?

I have a project that I am working on that requires the use of a rechargeable battery pack. The major issue I have is that the battery pack needs to be as slim as possible. So far all I could find are ...
0
votes
1answer
41 views

how to calculate solar panel size needed to run circuit

Iam doing a project and want to calculate what size solar panel to use to run my circuit. the only thing is that I have some size constraints involved cant be bigger and \$5\times5\$ in. I have a ...
0
votes
1answer
98 views

Any good microcontroller with highly accurate ADC for voltage and current measurement? [closed]

I have to build up a battery cell(single) monitoring system which can calculate the cell's (single) efficiency which should be atleast 0.1% - 0.5% accurate. The cell would be charged over a couple of ...
0
votes
1answer
37 views

LiPo battery charging pcb [closed]

I am looking for a 3.7V LiPo battery circuit that will handle over-voltage protection along with charging and 3.7V to 5V boost. I've found this popular pcb on ebay: ...
1
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1answer
37 views

Can i charge 2 li-ion 12v bateries in Series?

i am making an external batteries arrangement for my laptop. in this i am using two li-ion 12V batteries. now i am facing problem to charge this batteries in series or in parallel? i have tried to ...
0
votes
1answer
40 views

Run multiple charging circuits on the same battery [closed]

I've recently purchased a set of 3.7V 1A Li-Ion charging circuits available HERE and was wondering if i could charge the same battery using multiples of these to get a quicker charge. Is there any ...
0
votes
0answers
68 views

Can I (re-)use USB data lines after charger detection?

I'm looking to add the Texas Instruments BQ24253 battery charger to my hardware design and to connect it a micro-usb receptacle. Does BC1.2 Compatible D+, D– Detection mean I can no longer use ...
1
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1answer
47 views

Some problems with my dump load controller

The requirement is an automatic dump load controller; for balancing lead acid or lifo batteries. While the input voltage is above 1.75V the circuit should dump 10A into the load continuously. ...
0
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2answers
51 views

avoid Li-Ion batteries explosion

As a student group project, we are going to use Li-Ion batteries to test our charging and balancing circuit. These batteries at risk of explosion. How should we avoid that danger? Is there any ...
1
vote
3answers
64 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 ...
1
vote
1answer
53 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
57 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
36 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
62 views

Aspire Switch 10 USB Charger possible? [duplicate]

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
vote
0answers
47 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
1answer
78 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
91 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
72 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
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3answers
68 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
34 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
36 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 ...
-1
votes
2answers
74 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
57 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
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1answer
39 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
178 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 ...