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Questions tagged [battery-charging]

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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18 views

How can I use an IC family or adapter to switch automatically from solar cell to batteries & reverse?

simulate this circuit – Schematic created using CircuitLab How can I use an IC family or adapter to switch automatically from solar cell to batteries & reverse ? if no load => solar cells ...
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1answer
18 views

charging 24v LiFePO4 with DC power supply intended for LED strip lights

I want to charge my 200Ah, 8 cell GBS LiFePO4 using my Honda 2000 watt generator. (I live on a boat). I have a BMS, active monitoring and all that. I just want to make sure the below power supply is ...
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0answers
28 views

What's the optimal way to charge a battery? What are pitfalls to avoid? [on hold]

My goal is to keep my device's battery's capacity as high for as long as possible. I am only equipped with the power supply that comes with the device. What is the best way to charge the device? What ...
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0answers
12 views

Measuring recharge time and discharge time of VRLA/SLA battery in real time with MCU

I don't have any experience with batteries, so I would greatly appreciate some help with this topic. I did some research about battery SoC, gas/fuel gauge, coulomb counting. But all of that is just ...
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0answers
34 views

How to design a capacitive power supply with 4v battery backup?

I want to make a simple and cheap LED driver with a backup battery on mains failure. The battery (4v Lead Acid) should be protected from overcharging. Problem Would this circuit works? (what are the ...
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1answer
41 views

Bad Practice - Charging Lithium Batteries while powering circuit?

I'm using a 2s BMC to charge a 2s2p lithium battery pack (7.4v, ~6Ah). The output of the charging circuit is the same as the input - they're not separate. As a result, when I want to charge the ...
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3answers
46 views

Increase Boost Converter Current

I'm building a portable charger for my phone using a large 2.7v supercapacitor, which uses a very simple boost converter to create 5v. I am not concerned about input current, however, when a load (my ...
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1answer
34 views

Pager system charging pin and socket

Does anyone know what these pins are called? This is a pager from paging system used in certain restaurants. I'd like to know what it's called as I want to use it in my device's design. I need to know ...
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1answer
19 views

Charging a battery

So we have a charger outputting V volts and I Amperes and two rechargable batteries of the same capacity Q coulombs but different emf's V1&V2. Which battery would charge faster? Approach: So ...
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1answer
36 views

How to charge a battery when the charging socket is broken? [on hold]

First of all I'll explain my situation: I own a Bluetooth speaker, more precisely this one: http://www.leicke.eu/en/products/EP18108 Due to my clumsy hands it fell while the USB cable was connected ...
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1answer
22 views

Necessary voltage to charge NiMH using Solar Panel

I'm trying to understand which voltage I need to charge my NiMH batteries so I can purchase the components to do this. Actually I have 2x AA Ni-MH 1.2 V 1900 mAh and 4x Solar Panel 2 V ...
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1answer
32 views

Calculate battery state of charge percentage

What is the correct formula to calculate battery state of charge percentage based on the battery type (12v, 24v, 48v and so on) and the current battery voltage. For example if I have a 12v battery ...
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1answer
42 views

Rebuilding Makita NiMH Battery with Cells of Bigger Capacity. Will it Charge Properly on the Old Charger?

This is for a Makita 6932FD impact driver. It runs off a 14.4V NiMH battery of 2.6Ah. I ordered sub-C cells (with solder tabs, don't worry :P) that are 4.2Ah. I was reading about DIY NiMH chargers ...
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0answers
18 views

Load switch, battery charger, and battery supervisor IC? [closed]

I am looking to power an ESP32 off a wall wart. I would like to add a battery backup. A 18650 Li-Ion battery would be enough. To power the circuit I figured I could use a simple diode OR feeding a ...
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1answer
47 views

Gel battery overcharge

I have 2 identical 12 V 100 Ah lead-acid batteries in parallel. I used to keep them fully charged with a mains charger, one with a built-in algorithm for these kind of batteries. I recently hooked up ...
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1answer
33 views

Charging Multiple 3S Lithium Ion Packs Together

This is my current situation, just to provide background: I wanted to build these small battery pack modules that were 3S2P as a modular system, where a pack could be used with many different ...
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0answers
32 views

How do I use 12 V batteries to power DC loads and charge them at the same time? [duplicate]

I need to power an air pump for fish pond aeration (not yet bought) and also led bulbs (not yet bought). I have two used, but still ok, 12 V 200 Ah flooded deep cycle batteries. I decided ...
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2answers
21 views

Measuring battery voltage in PV scenario with MPPT charge controller with inverter

So I'm doing a PV project with wifi enabled statistics. I'd like to see the watts coming in and out and the battery charge level, estimated battery charge and discharge time. I'm designing PCB to ...
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0answers
17 views

Net Output current from two charge controllers producing different voltages connected in parallel to a battery bank [on hold]

I would like to know the effect of charging a 48 V battery bank from two solar charge controller sources (each charge controller is from a different manufacturer) whose outputs are connected in ...
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1answer
87 views

Battery capacity calculation/method [closed]

While calculating battery power capacity requirement for a circuit consisting of multiple loads having different power consumption, how should one proceed to avoid any error? How it is done in ...
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1answer
30 views

Relation between terminal voltage and charging speed in Lithium-Ion/Polymer batteries?

I tested charging a 5200 mAh (20 Wh) battery at 10W. Its charging level at the beginning was 20%. The terminal voltage was 3.68V. Now, I applied 10W of charging rate to the battery. The terminal ...
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0answers
70 views

Capacitive discharge excess being used for battery recharging

I am currently designing a circuit similar to a cattle prod that is intended to be attached to a drone. The cattle prod is powered by a lithium-ion battery, charging up a capacitor and then quickly ...
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0answers
31 views

Capacity/Losses/Charging/Discharging time of lithium ion battery

I am doing calculations for solar panel and I googled to find out that the best suggested battery used with solar panels are Lithiom ion batteries. I learned from wikipedia that pukert's law is not ...
2
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1answer
136 views

Why Peukert's law is always ignored in battery(lead Acid) guides available on Internet?

I am doing battery calculations for off-grid solar panel. I don't get that why battery guides on Internet always ignore Peukert's Law for batteries of solar panel. I want to have good approximations ...
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1answer
50 views

How to tell a battery's ideal charging voltage with a circuit?

simulate this circuit – Schematic created using CircuitLab I've been looking to build a universal charger for my laptop and phone, and I'm wondering; is there a viable way to adjust the input ...
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0answers
31 views

How to connect led strip to be powered by charger and batteries part 2

Li-ion batteries are nominally 3.6V and three in series will not supply 12V very long if at all. You could use four series batteries and a 16.8V charger rather than 12.6V then add a 12V buck step ...
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2answers
57 views

Is there a safe method to revive dead Li-ion batteries?

My dad has an electric leaf blower with a huge 56V battery pack. It broke so he let me dismantle it and salvage the Li-ion batteries inside. There were 16 18650 cells I got, but the voltage on all of ...
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3answers
43 views

How to connect LED strip to be powered by charger and batteries

I plan on using it mostly plugged in, batteries are there just for extra mobility and won't be used most of the time. Don't know lot about batteries so in first scheme I added a switch (pos. 1 ...
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1answer
30 views

What should be the V specs of a step down transformer for a 10amp car battery charger

I was looking to create a 10amp manual charger with variable voltage and current option for flooded lead acid battery (normally used in cars). I only know some basic electronics and usually make ...
0
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1answer
27 views

TP4056 - Li-lon Battery Charger temperature problem

I bought an TP4056 component for develop a Li-lon Battery Charger. While I was designing the circuit that was in the datasheet file I realized that the value of two resistors (R1 and R2) was not ...
2
votes
1answer
69 views

What are different battery capacity algorithms used? [closed]

I need to implement an algorithm to know the capacity of a battery. I don't want to use any external gauges which are available on the market. Can you suggest which algorithm(s) is/are popular? Can ...
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1answer
33 views

Battery sizing for motor?

I have a question regarding battery sizing and solar panel sizing ,I am not from an engineering background that's why i might need some help with this. I want to run a 24vdc gear motor 180W 11.5 amps ...
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3answers
428 views

Car battery (lead acid) discharges much, much faster than it charges?

Let's assume a lead acid car battery (12V, 50Ah, 250A output). According to BatteryUniversity article BU-403: The charge time is 12–16 hours and up to 36–48 hours for large stationary batteries. ...
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1answer
57 views

Gate driver for Mosfet PWM switching

I am designing a lead acid battery charger using Battery University for guidance. This is the circuit I made. At the input, I will be connecting an SMPS rated for 12V 15A, which will be adjusted ...
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0answers
51 views

What is the reason for high frequency noise when amplifier is powered with battery?

Hi I made a small headphone amp and powered it using lipo battery.voltage is stepped up to 5v.everything is working with direct supply (ie., while charging battery)but as soon as I unplug the charger ,...
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0answers
68 views

Can I charge 12.6 volt lithium battery (with 3S65P BMS) with 14.4 volt car alternator?

I have a lithium battery pack 3S65P (one cell 2000 mAh) so that's around 130 Ah. The battery states at 12.8 V when fully charged, then BMS is cutting off the charging to protect it. My ...
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0answers
26 views

battery life of rechargeable lithium battery

I am trying to determine the life of a lithium rechargeable battery (approximation) before a complete replacement is required. From Panasonic's datasheet, I see that at avg. 10% discharge, it is rated ...
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0answers
22 views

Charging NiMh batpack from Bench PSU [duplicate]

I have bench PSU that i use to test out computer parts and i have this battpack 2x 1200mAh NiMh cells connected in series that are outputting 2.4V total. My question is can i charge them via bench PSU ...
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3answers
82 views

How do I get 5V 10A output from a 3.7V li-ion battery for 64x16 led matrix display module?

Please I am new to electronics and new here. I'm doing a project which involves the use of a 18650 li-ion battery (or two as may be the case) to power a 64x16 led matrix display module which (...
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2answers
61 views

Charging a lead acid battery with a lower bulk voltage

Will a lead-acid battery completely charge when using a bulk voltage below the one indicated on the specs sheets for it, even if it takes longer? In my case the battery is in a place with temperature ...
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2answers
72 views

Is my 12v lead acid battery 100% dead?

so I got a ups with a 12v lead acid battery that was constantly on so the water inside the cells has disappeared, initially the reading voltage was 0.3v, and when I added distilled water it generally ...
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0answers
23 views

Charging an ezip battery with solar panels

How do I charge a 24v ezip battery using my solar panels setup? I have an existing solar system 2x100 watt panels in parallel using a PWM charge controller and a 12v 100ah battery. The simplest ...
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2answers
57 views

Multi-Cell Lithium battery balancing circuit explanation

I found a great application note on building a multi-cell lithium battery charger with cell balancing. http://www.cypress.com/file/70891/download The great thing about this one is that you implement ...
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1answer
40 views

Does a 3rd-Party Cable cause any harm when charging your Phone with the original Power Brick? [closed]

When using the original Power Brick the Smartphone came with to charge it, does a 3rd-Party cable cause any harm to the device or is there no difference to using the original cable?
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0answers
39 views

Need help with wiring for a battery

Sorry for the messy diagram, but that's what my circuit currently looks like. The s stands for a 12v sensor, and the led (light strip) being used is also 12v My question is, whether or not it is ...
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1answer
34 views

Should a off-grid wind charge controller be UL certified? [closed]

I recently bought a 2kW wind generator, 48V Charge controller and a UL certified off grid wind inverter for my Home based wind project prototype. My charge controller which I am using to rectify the ...
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1answer
36 views

What is the best battery configuration for a solar powered electric fence setup?

I have two solar panels: SunWize SW-85P; 85W max power, 5.1A, 16.7V. I have a charge controller: SOLAR BOOST 2000E. I have four 12V batteries: two Interstate SRM-24 (couple years old), two CarQuest ...
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2answers
131 views

How to limit HV capacitor charging current?

I have a voltage doubler, which is connected to mains (without galvanic isolation): It enticed me with its simplicity, configurability and option between charging speed or desulfatability. The ...
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1answer
31 views

what extra circuit to make a LiPo charger to a LiPo charger can sharing load?

As a (LiPo charger)(Charger A), I refer to this (LiPo charger can sharing load)(Charger B), this So, I have a LiPo battery with protection module. Can I just connect the LiPo and a LOAD in parallel ...
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0answers
47 views

What is the internal resistance of a dead NiCad battery?

I have a dead NiCad 19.2 V drill battery and I aim to jump it. I have a transformer with a capacitor - a DIY DC supply which someone made - which outputs 33V. I plan to put the 33V across the NiCad ...