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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26 views

20A 12V Load for lithium battery cycling tests - Car Battery + DC power supply with diode?

Ok I have searched, can't find anything. I have a high capacity lithium ion battery testing rig, and I have some iCharger 406 units that are doing the testing for me. That side works awesome, and I ...
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500 views

How can we understand portable battery for mobile phones having 10000 mAh capacity, and 6200 mAh “nameplate capacity”? [closed]

In USA, I always see portable batteries for mobile phone stating they have 5000 mAh, 10000 mAh, or 13000 mAh, etc. (One of the popular one is Anker as on Amazon.com). However, in Asia, I saw the ...
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59 views

Van with Solar power but no auxillary battery and only on sunny days. Do I need switches and isolators?

I have a 2018 Ram Promaster city cargo van with OEM 12v 70AH 120RC Sealed Led acid battery and a 160a alternator. Sitting on top of the battery I have a 1200 Watt pure sine 110v inverter connected ...
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140 views

Multi-cell Li-ion battery charging

I am trying to make a charger circuit for a battery pack consisting of 6 lithium ion batteries (cells) in series. Many battery charger ICs support multi-cell charging but do not provide cell balancing ...
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64 views

Battery charging while in use in a bank

I have fifteen 12V 150Ah flooded batteries in series as part of a 10kVA off-grid system. Every once in a while, I test individual battery voltages. I've noticed that a few of them are, regularly, ...
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5answers
75 views

When charging rechargable battery, should we care about watts and ignore voltage and current?

I know this might be a silly question, but it's from a beginner. Let's say I want to charge a rechargable lithium-ion battery, so when I charge it should I only check the watts and ignore voltage and ...
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55 views

Splitting laptop power supply to charge 3 NiMH battery packs, how to protect from overcharge?

I have a 20V 2.25A laptop power supply that i want to split 3 ways to charge 3 X NiMH battery packs simultaneously (5000,2000,2000 MAh each @ 7.2V). My plan is to use 3 of these XL-4015 dc to dc ...
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2answers
75 views

How does the different types of fast charge affect a lithium battery on a cellphone in terms of heat?

I know that fast charge technology allow chargers to communicate with the battery management chip inside the mobile phone in order to use different voltages to charge the mobile phone instead of just ...
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1answer
91 views

Which AGM battery terminals should be used when wiring 3 or more batteries in parallel?

With a 12V AGM battery bank of 3 or more batteries wired in parallel, is charge able to be drawn by attaching to any random positive and negative terminal across the battery bank? Is it optimal to ...
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127 views

Need a solution: Why does the battery voltage drop for custom PCB?

I have a custom PCB to control a solenoid or DC motor. Input voltage 6-7 volts with 4 batteries in series. I have a few questions: Why does the voltage drop by 1V to 1.5V when the switch is pressed ...
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152 views

Connecting a super capacitor to the solar battery in parallel

I find some people connect a super capacitor like (16v 88F capacitor bank) in parallel with the 12v 100Ah solar battery to optimize the surge current draws from the battery due to running heavy ...
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1answer
115 views

Boost converter voltage drop when charging battery

I made a 4s battery pack made of 18650 LiFePO4 cells that I'm planning to use for a mobile computing hobby project. My plan for charging it is to use a salvaged power supply from a computer along ...
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2answers
132 views

What is the effective equivalent battery capacity between Lithium Ion and Sealed Lead Acid batteries? [closed]

I was told by a battery salesperson that a Lithium Ion 100Ah battery is equivalent to a 260Ah lead acid battery bank. Is this correct? I understand that lead acid batteries should only be discharged ...
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72 views

DC Barrel - Powering a battery pack

I am looking for a DC barrel to power a battery pack. The battery in question is connected in 10S3P, that's is a nominal voltage of 36V. I am currently looking for a DC barrel that can withstand at ...
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98 views

How 18650 cells capacity is measured (what are the amperage and cut off voltage params)?

I have lots of used Li-Ion 18650s. I want to test their capacity. There are however 2 important parameters that I cannot find anywhere which is amperage and cut off voltage. Some people use 500mA ...
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25 views

cordlell battery/charger

I am converting my cordless drill to corded. to do this I need to use the charger which slides on the battery to attach to the damaged tools sole plate. I made a connection between the drill motor ...
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2answers
270 views

Charging 8 LiIon 18650 cells in parallel

I'm working on project that is Powered with 8 LiIon batteries/cells connected in parallel. Everything Works fine until batteries run out of "juice". For charging module I decided to use TP4056(@ 1A). ...
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1answer
732 views

Why are these LED current limiting resistors so big?

I'm looking at the charging circuit for a lithium ion battery that was made by Adafruit. Here's an excerpt: If there's a 5V rail from the USB port and a 470 Ohms resistor, is that limiting the ...
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41 views

Do I need a cut off circuit for my battery

Do I really need an auto cut off circuit for my battery when my charger only outputs 13V and 1A at max. The battery I want to charge is a 12V 7Ah Sealed Lead Acid. I heard that the cut off for lead ...
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1answer
69 views

Using the switch function of a DC-jack to disconnect a load

I want to use the switch function of a DC-jack to disconnect a load when a battery charger is connected to a battery which powers a constant current source that powers an LED. Is the wiring shown ...
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78 views

Allowable ripple current οf battery charger

The ripple of the charging current is pretty important for the aging of an electric battery. So, the current ripple should be as less as possible. In order to reduce the current ripple, we have to use ...
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1answer
97 views

Do I need to protect every single 18650 battery in a parallel block?

For my project, I will need to connect around twelve 18650 lithium-ion batteries in parallel. Is it necessary to protect every single one of them, or are there any protection circuits that can protect ...
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3answers
97 views

Can a battery be damaged by charging it with wrong amperage PSU?

Can a battery (specifically a lithium-ion type that you would get in a small portable electronic device) be damaged by charging it with a 5V 1A PSU, where the manufacture specifies as 5V 2A PSU? ...
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1answer
38 views

Balance charging battery pack one-half at a time?

I'm trying to wrap my head around how I need to go about balancing charging a few NiMh battery packs. I'm using a HiTec x4 charger, which supports balancing charging up to 6 cells at a time. However, ...
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124 views

Charge and discharge LiPo batteries with BMS 3S

I am looking for a solution to power a Raspberry Pi connected to a LCD screen 10 inch with three LiPo batteries 3.7V 5000mAh connected to two BMS 3S for charge and discharge. I designed the following ...
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141 views

Battery float voltage of CN3722

I want to charge a 2-cell Li-ion battery with CN3722 charging IC. According to my circuit design, the float voltage at the battery terminal should be 8.4V. But, the float voltage is measured as 13.44V ...
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1answer
87 views

Simple Li Ion integrated Charger and balancer

I am currently working on a project, which should contain a Li-Ion battery pack in the form of 8 18650 cells in 4S2P. The main consumers of the build are a class D amplifier and a single board ...
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1answer
67 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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30 views

Conflicting information on Qualcomm quick-charge 3.0 standard

Out of many fast charging protocols, Qualcomm quick-charge 1.0/2.0/3.0/4.0/4+ is a prominent one. I tried to find the specification of quick-charge 3.0 protocol. However, the material spread across ...
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1answer
78 views

Switched mode Battery Charger CC/CV operation

Shown below is the internal block diagram of a switched mode battery charger IC (LT1510). The LT1510 is a current mode, PWM (pulse-width modulated), positive buck switcher that operates in one of two ...
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53 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
133 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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1answer
104 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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3answers
124 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
73 views

Why is there a maximum charging current much lower than maximum discharging current on a li-ion pack?

I will have soon an electric scooter with a 60v (top 67.2v) and 35ah battery pack. As it is designed, it can be charged by one charger which pumps 2,5 amps or it can be charged by 2 chargers in ...
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36 views

US/Can - Maximum current in a single circuit in a 100A panel

I hope this is the right sub... I have a 100A pony-panel in the garage. I'd like to have someone add a wall plug for EV charging, ideally a 14-50, but I'd settle for a 14-30 if need be. I seem to ...
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1answer
233 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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1answer
109 views

Is less than 1A enough for TP4056 module to charge one battery?

I want to charge 3 separate 18650 cells with one charger. Each one of the batteries has their own TP4056 module. So in total there are 3 TP4056's. I know that TP4056 is rated at 1 amp input, though my ...
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233 views

Alternator current when charging flat battery

I've found some voltage-current-rpm graphs for car alternators and did not quite understand one thing. Basically, my alternator is rated at 75A (small car), which it should output above 2000 RPM or so....
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2answers
358 views

“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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1answer
67 views

Using solar power on a dual inverter setup simultaneously, that share different parts of a series battery bank

I had an idea and wanted to present it here and ask if anyone foresees any problems with doing this... I have both a 48VDC input inverter and a 24VDC input inverter that I want to run from a 72V ...
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2k views

Using TP4056 module to charge battery while load remains connected

I need a circuit that utilizes the tp4056 breakout board to power a NodeMCU ESP like so: tp4056 USB port connected: 18650 battery charging and NodeMCU running of USB tp4056 USB port not connected: ...
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78 views

How does USB port on a power strip detect the optimal current output?

I am looking to buy a power strip with USB ports and came across this one online. The description says "Top-notch USB smart charging technology which can detect and deliver optimal current output up ...
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48 views

MAX17205 battery pack fuel gauge configuration

I am working on the fuel gauge by MAX17205 for my project. https://www.maximintegrated.com/en/products/power/battery-management/MAX17205.html I am able to communicate with the chip using I2C protocol ...
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22 views

What happens inside a battery connected in parallel to a load and MPPT solar charger?

This seems like a common configuration: connecting solar panels + MPPT charger to lead-acid batteries which are also connected in parallel to an inverter. Assume that, momentarily, the battery has ...
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5answers
120 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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1answer
117 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
64 views

Rechargeable battery datasheet

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

Can I use 220V inverter as 12V power supply?

I have a pure sine wave inverter, it charges a 12V battery and converts 12V from battery to 220V during a power cut. Since it can output 12V to charge the battery at quite a high current I was ...
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2answers
61 views

How can I separate 2 power sources so only one can flow at a time?

I am building a battery charger circuit that can recieve power from 2 sources. However I need to avoid both sources from supplying power at the same to prevent any electronics from being damaged. So I ...