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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659 views

Parallel charger circuits

I'm constructing a power supply based on solar cells backed by batteries. The solar cells deliver between 0 and 4 A, depending on the time of day, while the charger I plan on using, the LT3652, has a ...
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2answers
9k views

Using the TP4056 to charge a LiPo battery and supply power to my circuit

My goal is to power a 5V circuit using a rechargeable battery with an optional USB power source. I have a TP4056 battery charger (with battery protection circuit) to charge my 3.7V 900mAh LiPo battery ...
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1answer
912 views

Why battery charge C rating is usually lower than discharge

Why most (or all?) batteries can be discharged at an higher C rating than the charging C rating? For example I have the following battery for my quad-copter: https://hobbyking.com/en_us/turnigy-...
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2answers
1k views

Is this fast charging method acceptable to charge FLA (flooded lead acid) batteries?

I have read online many slightly different methods for charging flooded lead acid (FLA) batteries. My real situation is this: I have six 6V FLA batteries wired in series in a 36V golf cart. They ...
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2answers
199 views

Why don't LiPo charger chips isolate the output during shutdown?

From what I've gathered, boost regulators from MCP1640 to TPS61090 disconnect the load during shutdown so that the battery is not drained during shutdown. However, charger chips like BQ24295 don't ...
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1answer
1k views

Charging batteries - what should I know

So I want to learn about batteries and the process of charging them. As a project, I'm going to create a solar powered charger to charge a 9v NiMh battery with 175mah capacity. I have a 15v solar ...
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2answers
1k views

How fast may I trickle charge a full LSD NiMH battery?

I've bought two packages of low-self-discharge nickel-metal hydride AA batteries, each made by a different well-known battery manufacturer. Sadly, the datasheets aren't very detailed: • One ...
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1answer
2k views

how to modify a taper charger of lead-acid batteries to be a constant current charger?

I have a huge, cheap and dumb battery charger which can charge a 12 V lead-acid battery with 70A, but it only outputs anything near (by "near" I mean over 30A) that value if I give him a completely ...
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1answer
70 views

Preventing overcharge of a SLA battery in a solar electric fence charger

I recently purchased a solar electric fence energizer, specifically the Patriot PS5. After it had been sitting in the sun a while, I noticed the battery was making a "gurgling" noise, which according ...
4
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1answer
59 views

Considering lithium-ion variant when picking a BMS board

I have 4 Panasonic NCR18650B batteries and want to purchase a BMS to charge them in series. The following board looks promising, but I'm not sure if it's fully compatible with my batteries. The main ...
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1answer
1k views

Can AC/DC conversion losses from solar panels be avoided with a Tesla Powerwall?

(background: I'm just playing with numbers, trying to estimate how many solar panels would be needed to fully supply the energy for a home and 2 Tesla cars) I've been reading up on solar panels and ...
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1answer
538 views

Charging a series of Nissan Leaf Li-Ion Batteries

I have an electric motorcycle I built out of a 1995 Suzuki GS500e. Right now it has four Optima Yellow Top AGM batteries in series giving me around 48v of power. I want more range out of the bike ...
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3k views

Battery monitor for a camper van electrical system

As one of my first DIY projects, I'm going to build a battery monitor for the DC battery/solar/inverter system in my camper van. The van has 440 Ah of lead acid batteries and DC currents up to 200A ...
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1answer
4k views

Power from 2 USB ports for faster device charging?

Use 2x5V from USB ports to speed up device battery charging? Do we get enough current (1A) from this 2 USB ports as well as from AC charger? I assume that voltages need to be the same, but what'll ...
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2answers
5k views

How to monitor voltage and charge status in USB battery pack

What's the easiest, least intrusive way to monitor voltage, charging status, and remaining charge of a USB battery pack? Battery packs and charging circuits for mobile projects can be complicated and ...
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2answers
393 views

How does this shunt regulator work?

I'm investigating battery monitors and I'm looking at TI's BQ76930 to take care of an 8 cell 24V LiIon. They provide the datasheet for their evaluation module (PDF warning) which includes the board ...
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1answer
375 views

Solar Powered MintyBoost

I've decided to try and make a Solar Powered MintyBoost. I've drawn up a very rough version of a schematic: As you can see, I plan to use a solar cell to charge a set of 2 D batteries (in series), ...
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2answers
179 views

Should I cycle my Li-ion from 100% to 80% or from 60% to 40% to maximise life?

Reading a few other answers including: this detailed answer, this one and this one on apple discussions The evidence in those answers focusses on the 100% start point in the discharge cycle. ...
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1answer
935 views

MCP73833 power path problem

I'm having trouble with MCP73833. It's 1S lipo charger powered from USB. I followed this figure from application note: My schematic: Battery connectors are X4 and X5, load is connected, USB is ...
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3answers
11k views

Topology of solar PWM charger

I am looking into the design of the most simple (yet functional) PWM solar chargers for lead acid batteries. (Numerous examples can be found on Ebay for about 10 bucks.) I have a hunch that they ...
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5answers
62k views

How much energy can be stored in a battery?

Can any one tell how much energy can be stored in the a single battery (12v) ? If I want to store 10 kWh of energy then how to calculate the number of batteries required. Editing notes: power -> ...
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2answers
569 views

Replacing NiMH with Li ion [duplicate]

I have a rechargeable vacuum cleaner with NiMH batteries, 1800mAh and 14.4 volts, 12 cells. The charger is 18v 200mA. The batteries have now died. Can I replace the batteries with 4 cell Li-ion in ...
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4answers
40k views

How do I determine the maximum current for charging a li-ion battery?

I have a cell phone that has a 1500 mAh 3.7 V battery. It comes with a 700 mA charger but I've sucessfully used a 1 A charger with no problems. I'm now trying to make my own multi-device charging ...
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2answers
958 views

Spark when connecting battery module to DC power supply

I am using a 60v DC power supply to charge a 48v battery module. I set current and voltage limits first, turn off the DC power supply, connect positive to battery's positive side. When I try to ...
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2answers
5k views

Why do chargers heat up when operating?

From my experience all chargers for Li-Ion batteries notably heat up when charging the battery. Why does that happen? Is the charger acting as a not that efficient power supply or is there any ...
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4answers
29k views

What happens if an AC voltage is applied to a battery?

Today I was checking the voltage between charging terminals going to the battery of emergency lantern using a multimeter. The multimeter showed a DC voltage of 9V and an AC voltage of 4V. Could ...
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3answers
17k views

How does charging a phone battery work?

For example, if a phone comes with a charger rated at 5V and 0.7A, when it's plugged in to charge, what dictates the current the phone draws, is it the resistance of the phone? If I = V/R, do phones ...
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365 views

If I were to discharge, recharge, discharge, recharge,…, an electronic equipment, would there be any negative effects?

Would there be any damage to a laptop or another electronic equipment if I use the internal battery supply till it has been completely depleted, then I recharge it to maximum, then wait for it to ...
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2answers
13k views

Will a device charger with higher current output necessarily charge an electronic device faster?

Charger specs Charger type : USB Charger Voltage : 5V Amp : 2 Amp Freq : 60 Hz Battery specs Type : Li-ion Power : 7.4 Wh Current : 2 Ah Discharge Voltage : 3.7 V Charging limit voltage : 4....
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2answers
6k views

Is voltage an accurate metric for testing the charge of an NiMH battery?

I regularly use rechargeable 1.2v AA NiMH batteries, and I'd like to be able to use my multimeter to test both how much charge they have when I've finished charging them, and how much charge they have ...
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3answers
672 views

How can I measure the charge of a rechargeable cell?

I'm using a bluetooth keyboard which need four AAA batteries. After the cells are charged (at least according to the charger), the keyboard still doesn't work properly; there is a green LED that ...
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2answers
1k views

charging a lead acid battery

(n00b question) I have a small (6 cell regular bike) leadacid battery and want to charge it via solar sheet of 15V - 0.3A. the voltage solar sheet changes and in cloudy day goes below 10V. does the ...
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2answers
4k views

Designing a Battery Charger With a PIC

I've designed the following circuit for a battery charger. With the PIC just turning the output on and off when it is charged. For the program design what would be better, to have the analogue input ...
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3answers
151 views

How can I trickle charge NiMH batteries as part of an IOT controller?

I have built an IOT motor controller board that's powered by 4 AA NiMH batteries in series. I want to use a solar panel to trickle charge the batteries, but the voltage slowly decreases even when the ...
3
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3answers
5k views

Do I need a BMS for Li-ion batteries connected only in parallel?

I have a device that runs on a single cell Li-ion / LiPo. The physical case for that device allows me to put in one to three 18650 cells. Unfortunately given the disposition of the cells, I can't buy ...
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2answers
375 views

Replace foil caps with ceramic caps?

I am repairing a battery pack (see below) which has some old foil capacitor (100nF) between a sense Terminal and the negative (together with a NTC thermistor). Can I replace the foil cap with a X7R ...
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2answers
967 views

Battery Level Indicator while charging

I am using an arduino to measure the battery level of a LiPo battery using a simple voltage divider and performing an analogue read of the battery level (against an internal 1.1V reference). My ...
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3answers
1k views

Connecting a higher-current power supply to a lithium-ion charger will damage the battery. Why?

I am not asking how the battery gets damaged, because that answer is straightfoward. What I am asking is why lithium-ion chargers allow batteries to be damaged by excessive charge current in the ...
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3answers
9k views

Can be lead-acid battery charged using NiMH or NiCd charger?

I would like to check total capacity of 64Ah lead "car battery" ^ by fully charging it and currently I have only older intelligent charger (Robbe Power Peak 8467). It directly supports charging ...
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1answer
33k views

Mobile/Cell Phone Power consumption?

I'm trying to work out the amount of watts my mobile phone uses and thus how much power it needs to charge back to full power. My handset is the Nokia 820 Lumia and the specs are as follows: Battery 3....
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2answers
625 views

Lengthen a AC to microUSB phone charger cord?

Can I effectively take a 3 ft standard cell phone charger (AC to microUSB, 750 mA at 5V) and lengthen the cord to 6 ft by splicing the cord or am I going to lose something in the mix? Do I need to ...
3
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1answer
734 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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2answers
743 views

Is it generally safe to use any USB charger with any USB device? How does device know what current is charger able to provide?

USB-IF's standards define some current limits chronologically: USB 2.0 (2000): 100 mA for low-power device 500 mA for high-power device Battery Charging specification (BCS) 1.0 (2007): 1.5 A for ...
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3answers
5k views

Charging NiMH batteries using a lab bench power supply

I have a project that requires some battery power and I have a 7.2V 3300mAh NiMh battery pack. I would like to charge it from my lab bench power supply which is current limiting. Would this be ...
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2answers
2k views

Eliminate standby leakage current of output capacitor in a DC/DC converter charging a battery

I am using a DC/DC converter to charge a battery. The output current of the converter is about 6 Ampere at 41 Volts. I'm trying to eliminate the standby leakage current of the output capacitors in ...
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2answers
2k views

Effects of continous slow charge on a battery?

If you connect a solar panel to a phone battery, but the solar panel provides about 1/4 (or 25%) of charge (mA) compared to the battery's original charger. Will this slow power charge the battery (...
3
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2answers
9k views

How to tell if battery is fully charged?

I have 12-volt, 200-ampere lead acid battery. I want to know how much capacity is left in the battery, expressed as a percentage. What is the exact mechanism to be used to determine find that, and ...
3
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3answers
674 views

Are laptop cells balanced while charging?

I have little-to-no knowledge about how the laptop batteries work. I know there is a microcontroller to actually verify the balancing between cells (and in case blow up a fuse or something similar). ...
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1answer
2k views

Load Sharing charging circuit for Lithium polymer

Charging lithium battery while at the same time trying to use circuit didn’t quite workout, with problems like the circuit not turning on and the battery never finish charging. The battery is 3.7V ...
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1answer
2k views

Li-Ion battery over discharge protection

I'm designing a Li-Ion battery charger circuit with a bq24702 chip. I will use it with two Li-Ion batteries connected in series. In order to protect the batteries from over discharging, I have to know,...