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Questions tagged [batteries]

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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Is there any design consideration to keep in mind when switching to higher capacity lithium batteries?

Long story short, had an RC drone with 3.7V ~1400maH lithium batteries and switched to 3.7V 2.2AH battery. But now the whole electronics cut-off when the throttle is pushed beyond mid-way (i.e. Higher ...
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1answer
62 views

DIY Use 18650 in place of 18500

I got a (relatively inexpensive) SmartYard LED Solar Spotlight as a gift, and have been playing around with ideas to extend the battery life. It uses a 3"x5" solar panel, and comes with a 3.7V, ...
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1answer
29 views

Battery Bank total internal resistance

Let's assume you have a battery bank not connected to anything and we are dealing with perfect ideal values. You just want to calculate the total battery internal resistance of your battery bank. To ...
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68 views

My new 18650 battery got a little scratch near positive pole

So recently I just bought two new batteries. When I took it from the package I accidentaly dropped one of the batteries on the ground and a little scratch appeared near positive pole. It's actually ...
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56 views

How do I combine 3 batteries in series and parallel with different outputs?

I'm looking to combine the 2 circuits shown in the picture below using a switch.(ON-OFF-ON) I would like to keep the 12V output seperate from the 24V output. This is to maximize efficiency when using ...
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56 views

How to charge two 18650s in series without a middle connection?

I have a battery pack of 2 18650 cells in series, so it is possible for me to charge it without connecting anything to the central 3.7v potential point as many answers mention? The battery in question ...
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1answer
45 views

Variable output from Power Bank (24W = 12v * 2A and 5.4W = 9v * 0.6A)

I started with trying to find 2 UPS for 2 of my routers with the following input specifications: 12v 2A 9v 0.6A I realised that buying 2 power banks will be economical than buying 2 UPS for the AC ...
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1answer
36 views

Battery Management System (BMS)

Suppose that a lithium-ion cell having total charge capacity Q=10Ah is discharged at a rate of 1A for 30min. What is the net change in the cell's state of charge (in percent)? Round to the nearest ...
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69 views

Diode OR 4 batteries

I have 4 batteries that are capable of providing a continuous 10 amps each. They will be connected in parallel to drive a motor controller with the intent on delivering 30 amps of continuous average ...
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0answers
40 views

“lithium for buffered usage in UPS”, or floating-charge lithium accumulator

For lead acid there are typically two paradigms of charging (or use-scenarios). First one is deep cycles, when you exaust 40-60% of capacity (not less than 12.4V), then charge it to 14.4 with ...
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1answer
76 views

One Way Current Restrictor

Will the below circuit act as a one-way current restrictor to allow 100A to flow out of the battery, but limit charging current to 10A into the battery from the alternator?
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E-bike batteries in parallel configuration

I built myself an e-bike from a kit bought on Amazon. It works great but I have a question regarding batteries for which I can't find an answer online. I found a great deal on 4.4 Ah (36V) batteries ...
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24 views

Battery voltage indicator using a RGB 5050 LED strip

I am looking to use a 5050 RGB LED strip to show either green, blue, and red depending on the battery I want two monitors voltage. If I take my LED strip and connect 12 volts to it and then ground one ...
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1answer
25 views

How to power two motor drivers and Raspberry Pi with one LiPo battery?

apologies in advance for the lengthy question. I'm working on creating a remote controlled rover. It is controlled by a raspberry pi, and driven by two MDD10A REV2.0 motor drivers (one for the left ...
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1answer
124 views

Li-Po battery ritual when using first time

We are using lithium-ion polymer battery in our project. The battery manufacturer recommends that battery needs to be fully charged and discharged for four times before usage as to reach its maximum ...
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29 views

Calculation for Battery Power Supply [duplicate]

I know a device I am making can run continuously using two AAA non-rechargeable batteries (namely Energizer Alkaline Max, at 5 volts) for X hours, and I'd like to provide advice on what rechargeable ...
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1answer
55 views

12 Volt DC Power Supply set up

Can I connect a 12 volt DC regulated switch mode power supply (good voltage control) in parallel with a 12 volt DC car battery (great amp supply) to supply the extra current need to run my RF-...
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1answer
31 views

Battery charger/discharger using N mosfet only

I want to make a battery charger discharger with an arduino, to be able to plot graphs. And afaik N mosfets are better in terms of Ron and cheaper and easier to ...
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2answers
75 views

Security/safety circuits in removable cell phone batteries?

It seems like the aftermarket phone battery is so flooded with terrible counterfeits it can't be too hard to trick a phone into thinking a battery is genuine. I'd really like to learn how to use an ...
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3answers
99 views

Battery charger with reversible polarity

I am building a charger for NiCD batteries and wondered if it was possible to accept the battery in either orientation and rather then protecting the battery detect the battery's polarity and switch ...
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1answer
95 views

Lithium ion battery how to connect to PCB? [closed]

I'm planning to use lithium ion batteries to power GPS trackers PCB that I've designed. I'm struggling with how to connect it to my PCB both as a final product and for prototyping? Also are there ...
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1answer
106 views

Avoid fire on a battery-powered device [closed]

I was trying to repair a battery-powered electric razor when I suspect there was a short-circuit. The device started heating and it began smoking a bit so I took it and put it in a bowl full of water....
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1answer
38 views

Battery management system for 3.7v [closed]

For my project i want to connect 109 Li-ion cell in parallel then the battery pack of capacity increased to 3.7v 272.5Ah and convert by boost converter into 48V supply to motor. how to protect those ...
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2answers
42 views

L298N H-Bridge : Powering 4 motors using (6) aa batteries vs (4) aa [closed]

I am currently wiring up my raspberry pi, H-Bridge and (4) 3-6v ratting motors. My question is, how will performance change based on me using 6 or 4 batteries to power motors? I noticed some tutorials ...
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1answer
56 views

Determining battery run time from Ah and MJ?

I am working on the following question: Two 100 ohm resisters are in parallel across a battery. The battery can store 240 MJ of energy and is rated 240 Ah. The battery depletes fully after two hours. ...
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76 views

Connecting different voltages in parrallel? [closed]

why I musn't I connect different voltages in parallel? also actually why I can connect them in parallel if they are "equal" .. why is that correct? Hi guys, why I musn't I connect different voltages ...
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93 views

Voltages in electronics

I'm wondering how exactly voltages are transfer between wires. I mean, once I've a voltage lets say 5v and I pulls from it a "wire" (not resistor) then at the end of the "dangling" wire itself the ...
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1answer
46 views

iPAQ Backup Battery Connector

I've used an H4155 on and off for about a decade now and every two years or so the backup battery begins to increase in standby voltage and fail. I prefer to replace it just for the sake of it ...
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1answer
51 views

LiFePO4 cells - self-balancing in series or parallel?

I am building various banks / packs from individual prismatic LFP cells, nominal 3.2V each. New and pretty large, 60-400AH. I have a good power supply, charge each cell independently, Bulk stage CC ...
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2answers
29 views

How over-discharge protection function works on this circuit?

How this circuit to protect so call "over discharge"? since there's no output + and - terminals on the board and this case the load should connect directly to B+ and B- without any protection for ...
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2answers
49 views

hybrid vehicle DC voltage boost

if i join two battery cells in series then the voltage will be added. what if i replace one of the two battery cells with a DC generator? My reason is because batteries (excluding Lipo) have modest C ...
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2answers
47 views

Op Amp Output Voltage

I have a question about an LM741 op amp IC. I am using the op amp as an comparator (open loop with no feedback), as seen below: When the op amp output is low, the output voltage is still around 1.2v....
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69 views

How to use CC/CV Charger with a DC/DC converter

I am searching for a solution to charge a battery pack (7S1P)[ICR18650] with a charger with CC/CV mode and I have a BMS for protection (I've done research to maximise the security of the battery pack)....
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“Safe” (but slower) charge method for AGM batteries?

My understanding of AGM vs flooded lead acid (FLA) batteries is that FLAs like to gas/outgas but AGMs do not. It is pretty much a requirement to increase the charge voltage of FLAs so that they gas ...
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4answers
687 views

Allowable reverse current into Alkaline battery

Anyone know what happens to alkaline battery if a small current pumped in? For example 0.5uA into a 9V battery alkaline? I want to add a simple 9V battery + rectifier as backup voltage to a 12v ...
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0answers
38 views

Hacking an eight cell battery monitor

My goal is to monitor each cell voltage of a seven cell li-ion battery and send this to a Linux board, specifically the Jetson TX2, over i2c. There does not seem to be any off the shelf component that ...
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1answer
45 views

charging 12v lead acid battery with OEM charger [closed]

I have an ExpertPower 12V 7 Amp EXP1270 Rechargeable Lead Acid Battery (link on Amazon here) and would like to safely charge it. Do you think this charger (Battery Tender 021-0123 -- link here) is an ...
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3answers
130 views

Long term car storage requires 2 batteries [closed]

I store my second car for 4 to 6 weeks at a time. There is no access to electricity, so a battery tender is not practical. The vehicle electronics slowly discharge the battery so it goes dead in a ...
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1answer
84 views

Switch module test circuit design

I am doing a project to make a test box that would to test the switch module in the photo below. Please see circuit diagram below for inside of the switch. Please note this switch is not an ordinary ...
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1answer
61 views

How to know when you've reached enough resistance for a battery?

Let's say I have a 1.5 V AA battery. If I connect its terminals together, that creates a short circuit which could make the battery catch fire. How do I know I've added enough resistance to the ...
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3answers
58 views

Non electrical background trying to make a cool little custom project - Help please?

Brief bit of background - I've built my own PC's, I've repaired phones, changed plugs, fit light fittings from diy stores, and have a basic (very basic) understanding of electronics, but have found ...
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2answers
142 views

Why the wave on a battery is neither square nor sine? [closed]

I’m measuring the electrical wave on a 1.5 V battery - why is the wave this particular shape? Isn’t it supposed to be sine or square? Thanks!
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1answer
31 views

LTC 4150 coulomb counter property

I want to monitor the capacity of a 7.4V, 2200mAH Li-ion battery. I have found a that LTC4150 coulomb counter can able to measure the battery capacity. So, suppose I have connected a fully charged ...
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3answers
861 views

Discharge time of 12 V 8.4 Ah at 5 mA

I have a motorcycle battery rated as 8.4 Ah (20 HR). It also says 8 Ah (10 HR) and I am not sure what the difference is. Anyway, I have a GPS tracker fitted with a rated ...
0
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2answers
70 views

Calculate the Li-ion battery remaining capacity

How can I calculate the remaining capacity (exact or approx value) of a Li-ion battery by measuring its voltage. The battery is connected the load and i know only the battery voltage and the value of ...
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5answers
111 views

A basic question about amps, watts, and charging batteries

Why do we speak of watts (and not amps) when we refer, for example, to the "7.5W Wireless Charger for iPhones," but when we talk about cord-based USB charging, the specs typically refer to amps (and ...
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2answers
51 views

Problem understanding impedance measurement device accuracy format

I am reading the datasheet of an impedance measurement device. Its accuracy is listed as '±0.4% rdg. ±8 dgt.'. What does 'rdg.' and 'dgt.' mean? And how should I interpret the accuracy? The device is ...
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1answer
101 views

Why are(n't) rechargeable batteries damaged by partial charging?

Over the years, I've come across websites and people with different opinions on the "correct" way to charge rechargeable batteries (I'm more concerned with laptop, tablet and phone batteries than with ...
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1answer
1k views

Is it normal for a lithium ion battery to read with a very low voltage on a multimeter?

I have a PS Vita and I suspect the battery is dead and needs replacing, as the Vita won't charge at all. But the issue could also be the charge circuit, as when plugging it in to charge the charging ...
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1answer
39 views

Rechargeable battery datasheet

Some parameters on the datasheet are a little bit confusing. What does the datasheet mean?