An electric battery is a device consisting of one or more electrochemical cells that convert stored chemical energy into electrical energy

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0
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2answers
65 views

Battery as reference voltage

I am fooling around with a solar panel and I am trying to make a circuit, which would monitor its voltage and eventually switch the load on and off. The thing is, I don't have a good "reference" ...
3
votes
1answer
77 views

How deleterious is topping-off my Li-ion batteries (phone/laptop) every time they drop to 90%?

I have read recently that frequent top-off charging of my personal electronics is hard on the batteries. Specifically, Li-ion batteries in recent model smart phones and laptops will show significant ...
2
votes
2answers
64 views

How “slow” is a Class T “slow blow” fuse?

I have a DC inverter that's rated for 3kw sustained with a 6kw peak (for up to 5 seconds). Per the Inverter manual, the manufacturer recommends a battery fuse rated for "at least 350 amps". How can ...
0
votes
1answer
33 views

Battery Bank - How to achieve full amp-hour ratings with simultaneous series & parallel connections?

I have four 12V batteries (all with the same watt-hour rating), and I would like to achieve dual voltages by interconnecting them, while achieving the following: 48V at the full amp-hour rating of ...
0
votes
1answer
36 views

Which battery to use to charge from 12v solar and supply raspberry pi [on hold]

I'd like to run my raspberry pi via solar energy. I have a 12v 20w solar panel with the following charge controller: ...
0
votes
3answers
470 views

C or D batteries instead of AA [duplicate]

a few days ago I had a asked a question regarding longer lasting batteries for a walking robot built with a Tamiya gearbox. Since the AA batteries were being depleted too fast, it was suggested that I ...
-3
votes
0answers
27 views

How to power a HP mini desktop 200-010 using two 12V batteries? [on hold]

I am aware I have to use a DC jack to do this. I don't know how. Please help me.
0
votes
1answer
66 views

Wave Solder an Alkaline Battery on a PCB (any concerns)? [duplicate]

I have a specific application that requires a board to be powered by Alkaline batteries and would like to solder direct to the PCB using wave solder vs. hand solder (need to consider a high volume ...
0
votes
0answers
16 views

How to decrease the absorption voltage in the case of an MPPT with fixed settings

I have an MPPT solar charge controller which doesn't have any option to input the custom settings. Though it works fine for new batteries but as my battery, Flooded Lead Acid 150AH, is little old and ...
0
votes
3answers
103 views

Why isn't Voltage considered in mAh ratings?

The capacity of a battery is measured in mAh, for example a 1000mAh battery can provide 1A for 1 hour. Why is voltage not considered in this equation? 1A at 5V draws twice as much power (P = V*I) as ...
1
vote
2answers
73 views

Using a published Watt-hour power curve for AA batteries, I get a theoretical battery life that's way lower than in practice

I'm doing something wrong mathematically. Can anyone spot my mistake? I'm powering some laser sensors and an arduino with 8 AA batteries and a step-up box for the lasers. I calculated a theoretical ...
3
votes
3answers
750 views

Why put a voltage divider between a battery and the battery pin of an RTC?

I bought a PCB module including a DS1307 real-time clock to evaluate if that RTC is right for the system I'm designing. Here's part of the schematic: The DS1307 works with a battery voltage ...
0
votes
1answer
36 views

Batteries for 3v gearbox

What kind of battery can I use to power a 3v DC gearbox, which can provide power for a longer duration? I have used AA batteries but they get depleted very fast. This is for a mechanical walking robot ...
2
votes
1answer
56 views

Can alkaline batteries withstand reverse current transients?

I am designing a device that can be powered either through two AAA alkaline batteries, or through its USB port, with priority with the USB port. I thought of a discrete circuit that fulfills my needs ...
0
votes
2answers
58 views

Battery socket selection

I'm designing a system including a 3 V coin battery. I am looking at a catalog of coin cell battery holders / sockets. Their cost varies from 0.25 to 2+ euros (single item), so we can say there's an ...
-5
votes
2answers
47 views

Solar Panel not charging battery? [on hold]

​i have a solar panel of 12V and i want to connect with 12 volt battery through charge controller than pv show different values like 12.6 , 11.1 , 10.5 , 9.6 ... so i am fully confused, please tell me ...
0
votes
1answer
33 views

Understanding Li-ion Battery(ICR18650-26H)

I trying to use a Li-ion Battery in my project. ICR18650-26H is suitable for my project(GPS data logger) I think. I am having hard time understanding one particular parameter in the specification ...
0
votes
1answer
33 views

Yet another Lifepo4 charging question

I have 16 * 3.2v 12AH Lifepo4 cells. I would like to use them as a 8*2 configuration, so to get 24AH 24V. I need 24V but could do with 12AH, 24AH would be better do. Now my question is, would it be ok ...
0
votes
3answers
121 views

Can I charge a 12v toy with USB? [on hold]

I have this small palm sized toy drone. It uses a 'charger' which houses 8 AA alkaline batteries. The charger plugs into the drone and the charger is activated by a toggle switch. I want to replace ...
1
vote
1answer
58 views

how to design power for arduino and servo

I'm designing a system where an arduino (3.3v) will run continuously, and occasionally turn a MG996R servo - this servo is pretty strong and can draw more than 2 amps. The servo runs fine off 4 AA ...
-9
votes
0answers
38 views

Replacing smart phone battery [closed]

my smart phone battery capacity is 2500Mah. now i would like replace my battery with 4000 Mah battery. Is this work or harms my phone. i need to know.
3
votes
1answer
30 views

hot swapping battery

I have a telescope with a computerized mount and some additional controlling systems. The mount requires a 5-10 minute long calibration process (to track stars accurately) every time it is powered. I ...
1
vote
1answer
41 views

Warm/hot starting a GSM/GPS module

I am new to electronics and trying to understand how a "warm/hot start" works. I am currently working with someone to design a PCB schematic for the SIM928A, a GSM/GPS module. In the hardware design ...
0
votes
1answer
41 views

One battery discharges faster than the other in my solar power system

So, I have solar power system and it is as follows: 2 AGM batteries each 100 Ah 2 solar panels 24-Volt , 250 Watts each a controller an inverter the batteries are connected in series to give a ...
150
votes
6answers
13k views

Why is there so much fear surrounding LiPo batteries?

I've been trying to design a charging system for a small robot powered by a 2S 20C lithium polymer (LiPo) battery. Were I to trust everything I read online, I would believe that the LiPo will kill me ...
0
votes
1answer
39 views

Battery voltage drops when connected to PCB

I have a circuit containing an atmega328p microcontroller with hc-05 bluetooth module. microcontroller is powered via 7805 regulator. When 7805 is supplied the source voltage by a 9V battery, the ...
0
votes
1answer
53 views

Router WiFi with solar energy

I want to create a backup system for my WiFi router (photo). I've purchased a solar panel (12V, 80W) and a battery (12V, 30Ah). How long should my router last with a full battery? Is it possible ...
-1
votes
0answers
28 views

Can I put two identical switch-mode power supplies in series to use a higher input voltage?

I have two identical switch-mode power supplies that are rated for a maximum input voltage of approximately 22V. I have a 36V battery that I want to power these from. I was wondering that if I put ...
0
votes
2answers
50 views

Two batteries connected to a resistor

In the circuit shown here the conventional current direction is from V2 to V1 and is equal to 3 Amp. I understand the theory. But, if I make this circuit with two batteries, according to the schematic ...
0
votes
2answers
195 views

LED circuit is draining AA batteries REALLY fast

My question is long, rambling and weirdly specific. I hope I'm not violating like 50 stackexchange rules, but I'm completely lost. Long-time lurker, first time asker and pretty new to circuits in ...
1
vote
1answer
60 views

About 18650 batteries possible accidents with reversed polarity

We all know that lithium batteries are dangerous and can blow up if we use them the wrong way. My doubt is, if I accidentally place them in the following sequence in series (Pay attention to the ...
0
votes
0answers
29 views

Inside A Coulomb Counter

I am trying to continuously measure the state-of-charge of a 3.5V nominal Lithium Ion battery. [My first question: Is this possible without using discrete method?] My approach is to place a sense ...
1
vote
0answers
46 views

5 volt small UPS design (review request)

I'm designing small 5 volts UPS that would allow me to run on battery or 5V source. If source is unavailable, step-up module takes power from battery. If this 5V source is restored, then this source ...
3
votes
4answers
2k views

Stacking batteries to get 200 volts and 21 amperes

I need to run an old DC motor that needs 200 V DC, 21 A full load; total 4200 W. I want to see if I can run it on V mount lithium batteries made for cameras. Each battery has: A ...
0
votes
1answer
26 views

Solar MPPT charging circuit

I'm new to this solar stuff. I bought an 20W solar panel. I'm planning to upgrade to 100W. But the problem is I've searched about mppt systems and get bit of confused. So please correct me if I'm ...
0
votes
3answers
88 views

AA battery current

For some reason whenever I play with a multimeter it always gives me results I never expect. In this case I am attempting to measure the current of a AA battery. I have the multimeter set to 10A on ...
-6
votes
1answer
98 views

Do DC current can be earthed? [closed]

If I take a 12 V battery and connected its (+) terminal with the (+) wire of a load and connected the negative wire from the load to the ground (earthing). I have heard that earthing absorbs current ...
1
vote
3answers
104 views

how do I dispose of fluid from a lead acid battery? [closed]

I am reconditioning a 12v lead acid battery, and a process I am trying requires me to remove aprox 2.5 to 3 oz of battery fluid from each cell. Before I do this, I'd like to know how to dispose of the ...
-3
votes
0answers
54 views

determining battery's capacity [duplicate]

Hello i'm on a task to measure a battery capacity and to be specific the battery lisocl2.Is there any possible method to mesure the battery's capacity without discharging it because my task is to ...
0
votes
2answers
60 views

Using Li-Po or LiFePo4 for diy motorcycle battery

Basically just after opinions on using LiPo or LiFePo4 for building a diy motorcycle battery. My current lead acid battery just died and i'm sick of replacing them after 1-2 years. Background info - ...
0
votes
2answers
39 views

Can I feed a 5V boost converter with 4xNiMH cells?

The spec page of my DC-DC boost converter (couldn't find a datasheet) says ”the input voltage should be kept below the output voltage”. And 4x the nominal 1.2V from an NiMH cell is below my 5V output ...
0
votes
1answer
45 views

Li-Ion batteries with 3 connections

If I have a Li-Ion battery with 3 terminals and do not wish to monitor the thermal pin do I need to pull it low or high. When I measure the battery from white to red I see positive volts as do I ...
1
vote
1answer
68 views

How to charge a lipo battery inline with load

How do you charge a lipo battery while it's still connected to it's load (e.g. like all modern mobile consumer electronics) using an off the shelf lipo charger? I have an Accucell S60 battery charger ...
1
vote
2answers
112 views

Battery discharge current

What is the meaning of standard discharge current mentioned on the datasheet of lithium batteries. Does it represent the maximum current load can take or it represent the instantaneous current ...
2
votes
2answers
241 views

Deciding On A Resistor For an LED

Let me preface: This is my first post on this exchange, so I will try to provide as much context as possible. If some details are lacking, or I've left this question overcooked, I apologize. So, I am ...
-2
votes
1answer
68 views

Charging a 3.7 V with a 5V usb charger [closed]

For a project, I want to charge a lipo battery (3.7V @2000mah) with a 5V USB charger. I'm not into electronics, so I don't know if is viable to do that. So, can I charger a 3.7 battery with a 5V ...
0
votes
0answers
34 views

TP4056 - Increasing charging current

I am designing a Lithium Ion charging circuit that will be using the TP4056. Currently, the peak current is 1A, and I would like to increase the charge current in order to complete the charge faster. ...
0
votes
2answers
62 views

Need help with inverter

I am wondering if it is possible too hook up an oxygen concentrator in my car for longer than normal trips. My gf needs 10 to 15 liters but can maybe get away with 10 (1 machine) for a drive. The ...
1
vote
1answer
87 views

How can the Model S have a three-phase motor? I thought it was DC?

Supposedly the Tesla Model S has a three-phase AC induction motor. I thought it ran on batteries. Aren't batteries DC?
-3
votes
3answers
92 views

What type of Lithium batteries work best for my project [closed]

I have a scooter with 48v/1000w motor, now I am trying desperately to find a lighter lithium battery but I'm constantly told it will be an impossibly expensive endeavour since lithium is very costly, ...