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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58 views

Recharging multiple batteries with solar panel

I have 1 solar panel: 7v, 1.5watt and 1.2v Ni-Mh batteries, 3000maH I am planning to use it to recharge my 1.2v batteries, I am not sure if i can charge 5 x 1.2v batteries using this solar panel. ...
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225 views

Clarifications about charging a 9V battery?

I have a project in mind with Arduino but I wanted to use a battery to power all of it. I have to power a Wi-Fi module and a small servo/stepper for a short period of time, maybe a RTC circuit and a ...
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2answers
505 views

How to find out the spec of an unmarked li-ion battery [closed]

I have got some li-ion batteries which I don't know anything about and there is nothing written on them. Can you advise some testing methods to find out about their specifications and charging data so ...
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48 views

Electrically rewiring cells into series or parallel, BMS decision

I was thinking about making a battery pack that would alow me to select two voltages by electrically switching (via transistors) two parallel 5S battery packs into one 10S battery pack. It offers me a ...
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1answer
66 views

Charging Lithium ion battery with a modified charger

I've a defective charger for a small LED torch light, its output is 4.2V / 500mA. I may not find an alternative one, so I'm considering modifying a mobile phone charger as following: The mobile ...
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49 views

I have a 9v battery that is only needed to output power during night time/when the sun is down, how can i do this?

My main question is, am I able to use a solar panel to only allow power flow when it is dark outside?/When the Solar panel isn't receiving any light? What would the circuit for that look like? In the ...
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1answer
64 views

Does charging near maximum C rate have the same effect as high battery levels?

We know: The maximum C-rate decreases with the increasing charging state. Let's assume an 2 Ah Lithium-Ion or Lithium-Polymer mobile phone battery. (2 Ah is considered tiny in 2018, but this is just ...
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405 views

BQ24133, unable to charge the battery

I have designed the circuit around BQ24133 and in my humble opinion, chose the right components while following the datasheet. I had the PCB made, soldered the components and started testing. The next ...
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1answer
270 views

MCP73833 and status to RaspberryPi

I want to use MCP73833 as a charger IC with the ability to route STAT1, STAT2, PG to RaspberryPi GPIO. Those are open-drain outputs and should be pull-up, according to datasheet. The datasheet also ...
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69 views

Using a GE 65W Boost Converter adequate to charge a 13s6p Lion BMS

I have a 13s6p Lion array with BMS I want to charge from a 12v source. This is the Arduino Lion charger project I am attempting After letting the smoke out of an undocumented Chinese boost converter,...
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2k views

Power factor and Harmonics associated with Electric Vehicle charging

What is the power factor associated with (typical) DC fast chargers and onboard chargers in electrical vehicles? Also, how much is the harmonic content (especially triple-N harmonics) associated with ...
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79 views

Li-Ion Battery Charging Board Temprature (Junction Temp)

I'm looking for a little help with a simple battery charging project. I've bought a pack of cheap USB charging boards on ebay (link) with the intent of using one to charge a small Li-Ion battery. ...
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260 views

Master switch placement for Li-ion charging circuit MCP73871

I am designing my first Li-ion charging circuit, based on the Adafruit Powerboost 1000C, and this is what I have so far: I am probably going to also add a way to read the battery voltage based on ...
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1answer
29 views

solar cells with old battery- safe?

I am charging an old (probably 90s or older) security system battery with 4 3.3v solar cells compounded and partly covered up to reduce the voltage. the standby charging voltage is 13.5-13.8v, and the ...
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51 views

Efficient battery charger cutoff circuitry

I've been designing a battery charger circuit for a while. I couldn't decide how to shut down the current flowing through battery. Actually, a simple output diode helps a lot but they make ~0.5V drop ...
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4answers
104 views

What is better, always keep connected or discharge/charge cycles for the smartphone battery? [closed]

My smartphone is serving as internet hot-spot over WiFi for my home/office laptop. I’m keeping phone always plugged in charge. Most of the day I’m home and using a lot of traffic. What is the best ...
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26 views

Restore or replace an old NiCad battery

I was finally able to buy a used Toshiba T4700CT to play my DOS games. I cleaned it, disassembled it and replaced both the backup battery and CMOS battery, but I have a question regarding the main ...
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1answer
158 views

Converting 6c (3s2p,4.5v) DC motor to 1s4p 18650 charging/protection

Having a hard time figuring this one out, I am trying to convert a 4.5v 25w dc fan from an air mattress pump to run off a rechargeable battery pack made with 18650's. This is going to be charged and ...
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705 views

PWM Battery Charger Power Schematic

I am trying to come up with a simple Battery Charger design, which utilizes PWM control. The use of high frequency PWM is to reduce the size of the Transformer that is to be used. Planning to use ...
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1answer
142 views

High voltage battery charging with low voltage charger?

I have two 3.7V batteries to be used serially for my device. Is there any way to charge these batteries with 3.7V charger? Or do someone show me a circuit having a button which when pressed connects ...
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47 views

Adapting 18650 Lion specs to charge 6 in parallel

I have an eBike battery pack of 78 18650 cells (13s6p) that I need to charge for storage pending a BMS. I have the following specs from the data sheet: I want to charge the individual cells (of six ...
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0answers
125 views

Best battery configuration: 1s1p vs 3s1p vs 1s3p? [duplicate]

I’m designing a product prototype using a single board computer (like a Raspberry Pi) that requires an 8-18V DC supply. It has to become battery powered, so I’m looking into the best possible ...
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1answer
228 views

Drone Thermal Imaging solution: Power Supply Module - Design Review & Load Sharing Query

I'm designing a DIY Thermal Imaging solution for my DJI Mavic Pro drone. Whilst the full design has been included for background info, this post refers to the power supply module design. The pertinent ...
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3k views

after replacing micro usb port, tablet charges only 450mah [duplicate]

I changed micro usb port which was broken (it takes out from motherboard) on tablet. On motherboard are 5 contacts and one is damaged (4. - it is for data transfer, ID). I solder +5 VDC contact and ...
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0answers
207 views

How to connect 2 thermistors for battery protection?

I'm planning to use BQ24100 for charging Li-ion cells connected in parallel. Unfortunately, the cells have to be separated by few centimeters, so I have to use 2 thermistors. So, how to connect 2 ...
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1answer
201 views

18650, charge and supply at the same time

I am planning to use a NodeMCU with a couple of encoders to determine the position a telescope is pointing at. While running, the device will be connected to wifi all the time since it needs to ...
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1answer
999 views

BMS for Li-Po with balancing and protection

I want to build a robot based on Raspberry Pi with Raspberry Camera. It will use tracked car chassis to move around my flat. I'd decided to use 3-cells Li-Po battery to power this robot (because of ...
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0answers
77 views

charge controller question: disconnect pv with mppt from full battery

I'm creating a battery charging model with pv and a buck converter controlled via a P&O mppt algorithm. My charge controller currently disconnects the pv panel from the battery as the latter ...
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1answer
56 views

Is the usual model for batteries still valid in the reverse direction?

We all know the usual (simplistic) model for batteries, that is, representing it by a pure constant voltage source in series with its "internal resistance". This is probably sufficiently precise for ...
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75 views

A cheaper way of Lipo battery charge and power switching

I have been reading stackexchange for last 5 days but could not see any proper / answered circuit / discussion about Lipo battery charging and backup and thus asking the question here. I am doing a ...
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95 views

Estimating the capacity of unknown LiPo cell

I recently salvaged this small (30 x 9.5 x 3.5 mm) LiPo single cell battery from an old device that lied broken for at least 3 years. Therefore I expected it to be garbage ready for recycling, but ...
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2answers
99 views

Solar battery charger

I'm trying to simulate the following circuit taken from http://www.techlib.com/electronics/battery_chargers.html. The circuit is supposed to charge 6V battery (shown as Zener diode in the circuit). ...
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602 views

Have my AGM batteries reached EoL or is my charger defective?

My setup: two 12V 20Ah AGM batteries in series for 24V. Typically discharged to about 50% depth on average about 3 times per week (less often in winter, batteries are kept indoors). The current set of ...
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0answers
29 views

Software definable battery controller to be able to re-use various laptop batteries

I'm looking to retro-fit an older small netbook Toshiba NB100, by replacing the logic board with the single core Atom 1.6Ghz with an up-board core. A hardware/software solution for re-using the ...
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1answer
139 views

Power bank DIY Build( Regarding protection circuits)

I have been toying with the idea of making a power bank as I have a few old laptop batteries lying around which are still working well. I plan to use these components: Constant current lithium ...
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0answers
58 views

Can I charge a Li-ion cell with high voltage until reaching the nominal one?

I have one 18650 cell which has a nominal voltage of 3.1 V in the specs. Right now, it is discharged and reads 2.8V. I was wondering if I can charge it directly with a panel solar (18V) until it ...
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0answers
318 views

Arduino charger, can I use a step up regulator in the circuit?

The question is: how would I modify the below circuit to make it work with an 18650 3.7V 2500mah battery which I want to charge at 1C during constant current phase? Note, 1C should be fine as ...
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1answer
164 views

Using MCP73213 for charging two Lithium ion batteries connected in series

My device has some loads which use 5V. I can't use a single Li-ion Battery as it'll give only 3.7V. So I've decided to connect the batteries in series to get 7.4V power supply. Since my wall adapter ...
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1answer
73 views

What additional electronics are required for construction and use of a 240-cell Ni-MH battery pack?

The robot (R2-D2) that I am building requires a MASSIVE battery. 800 Wh, to be precise. Cost is the primary driver, second to weight and volume. This, in combination to the high cost of any (non-lead) ...
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1answer
222 views

Help me to understand VOOC fast charging for lithium ion batteries?

I know common VOOC charger have fast charging rate of 18W(9V/2A). But how it possible even current is only 2A. I mean 2A current have only stored charge 2000mAh(2A*1h). How changing voltage can charge ...
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0answers
57 views

Regulating load to find MPP

I'm trying to design an MPPT system for photovoltaic cells for a school project. As far as I understand I have to change the duty cycle of a buck converter to change the voltage of the PV so I can ...
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0answers
207 views

How to disable the remainder of a circuit when a charger is plugged in, using minimal components?

Is it possible to detect if a charger in plugged in, and disable (or completely disconnect) any of the remaining circuit? This image from Detecting When a USB Device Is Plugged In For Status LED ...
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1answer
66 views

can you power a load and charge a battery with a votage source 2x the battery voltage?

I'm sorry, I am very new and green to circuitry, and probably frustrating to read. I have a hypothetical question about a circuit with a 6.6 v charging source that is both charging a 3.3 v 100 ah ...
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1answer
39 views

Simulate Battery for Bluetooth Device

I have a little bluetooth to aux in my car which is battery powered. I want to hook it up directly without the usb cable hanging when charging. The problem is that I can't leave it always connected ...
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1answer
51 views

Charging devices with different max voltages

I have a project that requires me to make a portable power pack that can be charged up and then power different devices. The product needs to have two USB charging ports and hold around 7Ah. The ...
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1answer
180 views

LiPo charger module for 5.2V/2-3A load

I have a load (more specifically a Raspberry Pi 3 B) which requires a voltage of 5.2V and needs around 2-3A current. It should be powered by a LiPo battery with a capacity of 6000 mAh. In addition to ...
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1answer
415 views

Increasing Overdischarge Protection Voltage in DW01A

I am working on a academic project which requires TP4056 along with battery protection circuit (DW01A). The ciruit uses a 1S LiPo 500mAh battery. I want to keep the Overdischarge Protection ...
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159 views

How to trigger 12v environment on PowerBank [duplicate]

The Desired Result: via rechargeable battery, power a 12v 1 meter led strip that takes 1.2 amps. I have purchased an orico power bank with 12v 1.35amps output as it meets the dimensions needed for ...
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0answers
34 views

Replace a power adapter 12V/1A DC with 15V/0.8A [duplicate]

I have a battery-charger that has an input of 12V/1A as specified in the specs. Can I replace the adapter with a 15V/0.8A ...
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1answer
113 views

Charging the 18650 battery [closed]

I create a arduino robot car and I used the power bank for the supply of arduino. And I used L293D Motor shield arduino and the supply I used is the 4pcs of 18650 battery, I series the 2 pairs of the ...

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