Questions tagged [battery-charging]
Please specify the battery type in your question. Include chemistry (e.g. lead-acid, Li-ion), voltage, capacity (in A·h or W·h), number of cells and how they are connected (series or parallel) .
596
questions with no upvoted or accepted answers
4
votes
1
answer
98
views
Solar panel for 6 V, 1100 Wh battery
I have a sensor in a remote area that draws 15 mA @ 6 V for 16 hours each day, powered by a 6 V, 1100 Wh low discharge battery. I'm trying to achieve around 2 years of autonomy.
Daily consumption is 1....
- 53
3
votes
0
answers
447
views
Is a single Schottky diode adequate to support power-path in a basic USB -> LiPo charging circuit?
I'm working on a hobby project based on the ATmega32U4. I'd like to be able to power the device by USB or LiPo battery. I was looking at the schematic for the LilyPad ProtoSnap Plus and saw a diode ...
- 626
3
votes
0
answers
433
views
Adding an adjustable constant current option to a LM5175 circuit
Disclaimer: I'm no electronics engineer and I have no experience in this kind of circuit! I do occasionally design simple analog circuits and PCBs, barely messing with opamps.
Context:
I'm about to ...
- 131
3
votes
2
answers
174
views
Wind-powered fairy lights + battery charger: preliminary help
I'm new here and asking for help designing a yard-art project. I would like to use a small DC motor as a wind-powered generator to charge a battery (with overcharge prevention) and run some battery ...
- 31
3
votes
0
answers
1k
views
TP4056 and ST32F103C8T6 shorting after few uses
Complete schematic:
Top part:
Lower part:
This is the circuit schematic, top part is sensor, bluetooth, microcontroller, oled and pins related all working from 3.3v coming from regulation of a ...
3
votes
0
answers
392
views
Sense resistors in system-side Li-Ion charger/gauge circuit
I'm working on designing a charger and fuel gauge circuit for a premade 3S3P Li-Ion battery pack. The battery pack has basic protection circuits onborad (over/undervoltage and a PTC) and only the pack ...
- 1,733
3
votes
0
answers
60
views
bq24171 battery charger does not charge
I want to make a 2S LiPo battery charger. I used the bq24171 chip from TI and followed the datasheet. All the conditions to enable charging seem to be ok but there is no actual charging (no output ...
- 31
3
votes
0
answers
106
views
Ultra low power battery
I am currently in the middle of a project and I am quite unsure of what type of battery and battery charger I should be using. To be honest I have never worked with battery or battery charger yet.
In ...
3
votes
0
answers
2k
views
USB battery charger noise in an audio amplifier
As the title says, I'm having some issues with battery charger noise and an audio amplifier.
The PCB with the charger and amplifier is connected to a GSM device, and that's where the audio signal for ...
- 101
3
votes
4
answers
151
views
Advice for a Solar Charger and Battery Project
I am a high school robotics teacher (no formal engineering training) and I am taking a group of students to Kenya this summer to work with high school students there. The organization we are ...
- 135
2
votes
0
answers
53
views
LI-ion charging: Should I turn off the charging circuit to measure battery voltage?
I'm working on a 120VAC smart sensor product that contains a single internal soldered-on LI-ion cell to provide backup power for up to 24 hours after power failure with reduced functionality. I know ...
- 153
2
votes
1
answer
161
views
Battery thermal protection circuit
I'm trying to design a circuit to be used with some 12V LiFePO4 battery packs which don't have an integrated heater, so I can add thermal protection.
The circuit would sit between a 65W solar charge ...
- 439
2
votes
1
answer
85
views
2S li-ion charging
Would it be possible to charge 2S li-ion battery with MacBook m2 charger which can output 20V 1,5A or 15V 2A or 9V 3A or 5V 3A. I am planning to use this Li-ion Lithium Battery 18650 Charging and ...
- 21
2
votes
0
answers
109
views
Detect battery type (NiMH, 14500, alkaline) and only charge the rechargable types
I'm building a flashlight that uses AA size batteries. I want to automatically detect the battery type and charge it with the appropiate method, and also detect alkaline cells so it won't try to ...
- 21
2
votes
1
answer
140
views
Help with battery charge circuit on STM32F4
I followed some sources and came up with a battery charge circuit. The way it's wired "should" also give reverse polarity protection to the circuit. Could someone help me understand if I ...
- 45
2
votes
0
answers
89
views
Why is is OK to use a relay to parallel lead-acid battery banks for charging?
I am currently faced with a British-built, Lloyd's offshore certified sailing yacht from 1998. Everything seems to be well-thought out and of the highest build quality. I am thus assuming that their ...
- 5,229
2
votes
0
answers
974
views
Is the JEITA battery charging temperature standard accepted by EN62368-1?
EN62368-1 Annex M.4.2.1 mandates that the battery charging circuit shall 'stop charging' when the temperature of the battery exceeds the highest specified charging temperature (typically 45°C). ...
- 21
2
votes
0
answers
2k
views
What's the minimum float voltage to maintain a small lead-acid battery?
I wish to 'float' a Yuasa Y7-12 7 Ah, 12V sealed lead acid battery.
On Battery University it says that a voltage of 2.25-2.3 V per cell (so 13.5 - 13.8 V) will allow a lead-acid battery to regulate ...
- 265
2
votes
1
answer
172
views
How to choose components to charge/discharge 18650 battery block for a robot
I want to build a battery for my robot, and I don't understand how to choose components to use after BMS to charge/discharge the battery.
I have 4 pieces of 18650 batteries: 3.7 V, 6.7 A maximum.
This ...
- 51
2
votes
0
answers
142
views
Trickle Charge Car Battery / Car GND versus Negative Terminal on Battery?
I have a few cars that don't get driven in the winter, and I am going to keep hooked up to a trickle charger to charge / maintain the 12V lead acid batteries.
In reviewing the trickle charger ...
- 1,917
2
votes
0
answers
1k
views
TP4056 with load sharing
Does the TP406 with protection also needs a load sharing circuit?
I got the following schematic. But I saw this post on load sharing. Can I add that to this design too? I could not really find a good ...
- 121
2
votes
0
answers
162
views
Does Sony NP-F type (generic) batteries have any over discharge protection circuitry inside?
I use these Sony NP-F550 or NP-F570 Li-PO generic batteries (8.4V) for video light and for powering my DIY projects.
I've read you shouldn't discharge a 8.4V Li-ion (it's a double 3.7V cell inside the ...
- 587
2
votes
0
answers
438
views
USB Type-C to Type-C Cable has voltage in one orientation only
I'm designing a battery powered device, which gets charged with 5V.
I wanted Type-C as the charging interface, so I designed an appropiate Type-C Port for the device:
As you can see, I added the ...
- 73
2
votes
1
answer
795
views
Hall effect current sensor ACS712 for battery application
I want to measure the current of 12V lead acid battery for charger application. So mostly, I need bidirectional current sensing. The current measurement can be done using shunt resistor or using hall ...
2
votes
0
answers
379
views
Connecting lithium ion batteries in parallel
I have 6 lithium ion batteries that are from some Android tablets that I've recycled, they are rated as 5000 mAh, 3.8 V
and have their own protection PCBs soldered to them. The tablets they came from ...
- 167
2
votes
0
answers
27
views
How do bluetooth headsets handle 2C charging current?
I have used a few of those bluetooth headsets that are wireless stereo (TWS) ones and are charged by a case in which you insert them. I haven't used expensive ones, just rebranded chinese ones. All of ...
- 91
2
votes
0
answers
152
views
Supercapacitor as PMIC Storage Element
I'm currently trying to design a system that incorporates an ADP5092 which can use a supercapacitor as the storage element but I am also considering other similar PMIC chips so this is more for ...
- 63
2
votes
0
answers
1k
views
DIY Power Bank without auto shutoff
I own a small data logger for recording accelerations. The data logger is a Slam Stick X with integrated 250mAh rechargeable battery. My problem is that the capacity of this integrated battery is far ...
- 23
2
votes
2
answers
719
views
Efficiency of charging a lithium ion battery with a lithium ion battery
Should I need to charge one lithium ion battery with another, what sort of loss would be typical?
If I had a 65wh battery, can I calculate how big a battery I need to charge it taking into account ...
- 121
2
votes
1
answer
120
views
Battery Management Controller
I designed a wearable with a 3.7V Li-Po battery (381018). Everything worked good at the begining and now after 6 months I realize some circuits are not charging anymore. For what I understood when I ...
- 21
2
votes
0
answers
103
views
Strange Behaviour of Lipo Battery ESR during charging
I performed three charge tests on a single cell 190mAh Li-Po battery with Keithley Battery Simulator instrument. Charging started at 3V and stopped at 4.20V in all tests.
After completing the three ...
- 382
2
votes
0
answers
86
views
Power supply charging backup power - current flow via mosfet
I have following diagram on falstad
Top +5V is main PSU (12V 10A). Bottom +5V is battery (12V 2.3Ah). I have load about 2-3A so I dont think diode is good solution. Well I am trying to achieve ...
- 147
2
votes
0
answers
398
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 ...
- 21
2
votes
0
answers
618
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 ,...
- 21
2
votes
0
answers
297
views
How can I size the current ripple of a DC-DC converter for lithium batteries
I am designing a bidirectional DC-DC converter to charge and discharge batteries on a DC bus. The power of this converter is 50 kW and the average current in the inductor (the same as that on the ...
- 21
2
votes
0
answers
155
views
Help to identify 10-pin IC in a GPS unit
I am trying to repair a GPS unit. There was a zener diode (to56 PolyZen protection diode) which had blown off and I had replaced. This is part of the battery charging circuit I believe, as once I ...
- 147
2
votes
0
answers
464
views
Solar charging a lipo battery with ESP8266 as a battery load
I am trying to add solar harvesting capability to my IoT device based on esp8266. I am using linear charge controller (MCP 73831) with solar input to charge a 500maH lipo battery.
An observation when ...
- 39
2
votes
1
answer
6k
views
Li-po battery balance charging circuit
I work on a solar tracking project and in this project I have to charge my Li-po battery to store power and use this power for supplying the system.
For this problem, I searched for Li-po battery ...
2
votes
0
answers
381
views
Lead-Acid Battery Desulfation Circuit Design:
I'm seeking ideas for making a pulsing lead-acid desulfation circuit design. Several circuit designs are available via Google image search, however, I'm hoping to get some help here to design a ...
- 344
2
votes
0
answers
968
views
NI-MH battery charger using MAX712
I don't belong to electrical engineering but I am trying to develop a intelligent Ni-Mh battery charger for one of my project. I am using MAX712 battery charging management IC. Reason behind that is:
...
- 601
2
votes
1
answer
5k
views
Connecting multiple batteries to a battery tender / trickle charger
I have multiple 12V batteries, some small ATV starter batteries (12Ah and 9Ah) and some deep cycle (120Ah and 97Ah).
Can I connect all those batteries to the same battery tender in parallel?
Could I ...
- 145
2
votes
1
answer
907
views
How to connect four different ground planes in the same PCB?
I am working on a project which uses the LTC4020 multi-chemistry battery charger from Linear Technology. The design includes a microcontroller ( NXP KL25Z) to provide additional outputs and ...
- 21
1
vote
0
answers
34
views
BMS 3S (S-8254A) with SJT-150E charger won't fully charge
Lately, i've been trying to use a BMS 3S that is based on the S-8254A IC to charge a group of three cells that I planned on using in series.
To charge the cells , I'm using a 12,6V 10A SJT-150E. This ...
- 11
1
vote
1
answer
56
views
Help review my schematic for a LiPo + USB power supply and charger
I've recently redesigned this schematic based on the feedback I've received on an earlier post.
Questions:
Will power source switching MOSFETs work in the configuration I'm using?
Will the tri-state ...
- 21
1
vote
1
answer
51
views
Load cycler circuit analysis
Hello I am attempting to build a simple load cycler that will charge and discharge 3.7 V 18650 batteries for a certain number of cycles.
I would like to program it to do something like this:
I'm not ...
- 27
1
vote
1
answer
66
views
How would I go about supplying the measurement circuit with multiple batteries ouputting microAmps of current
If I am doing a test for lithium-ion batteries where I am trying to measure a small current when I apply a small load (on the order of microAmps)
How would I go about using this same current to power ...
- 11
1
vote
0
answers
68
views
Reverse current blocking FET circuit for batteries, does it work?
Based off of a previous post found here, I've created this circuit below to simulate the reverse current coming back from an FET. I've replaced the switch with a NMOS that's controlled by the presence ...
- 31
1
vote
0
answers
77
views
How can I store a energy from a low output?
I need a simple answer to a simple question: How can I store energy as in a battery to use it as energy for an LED lamp or something else? The available power is 50mV- 60mV and 70mA - 80mA.
- 11
1
vote
1
answer
365
views
Designing a BMS for 2S2P 18650 batteries
I am trying to design a BMS for 4 18650 batteries in a 2S 2P configuration.
Some of the requirements are:
I would like to charge and discharge from the same connectors
I would like to implement a ...
- 41
1
vote
1
answer
94
views
Selecting a charge time for a NiMH charger at 1C
I'm building a solar charger for an Energizer 8.4 V, 175 mAh NiMH battery with a MAX713. The solar panel is 15.4 V, 200 mA. If I charge them at 1C (175 mA), would it be better to set the charge time ...
- 11