Unanswered Questions
963 questions with no upvoted or accepted answers
6
votes
0
answers
1k
views
How to protect single cell Ni-MH battery (overcurrent, undervoltage, overtemperature, etc.) during discharge?
Story
I am designing a boost converter for a battery powered board. I am planning to use single Ni-MH battery. The needed output voltage is 3V3. The device will be in deep sleep mode (drawing few ...
CommunityBot
- 1
4
votes
0
answers
60
views
Battery Maintainers
I have a bunch of non-rechargeable batteries I've kept in stock & haven't used almost at all (almost fresh off the packaging). Like all tools/equipment I have, I expect them to last me as long as ...
- 409
4
votes
0
answers
684
views
How separators prevent electrons from passing through
Separators (polymers) in batteries keep electrons from passing through but they let ions through. How do they do that if electrons are smaller than ions? Can we imagine it as a kind of 3D wire mesh ...
- 459
3
votes
0
answers
41
views
What kind of model can be used to simulate over- and under voltage in a Li-Battery pack?
So far I have not much experience with modeling in the field of lithium-ion cells or batteries except equivalent circuit models (ecm)-models which I've implemented and used for simulations in Matlab/...
- 185
3
votes
0
answers
2k
views
Help to understand the operating logic of the Bosch charger
I ask for your help to:
determine, if possible, the type of transistor T5, T7 (SMD code: MK3C).
help me understand the operating role of the set T5, T7 and R23, R33 in the circuit (it's like a ...
- 89
3
votes
0
answers
104
views
Blinking fishing lure, best way to save this design?
Background
I ordered 10 PCBs with a design for a blinking fishing lure (it's a hobby project.) I have discovered I made a mistake when I designed it and wanted to see if anyone has any ideas how to ...
- 72.5k
3
votes
1
answer
123
views
IATA battery rules
Following IATA guidelines two threshold limits are indicated: 20Wh for cells and 100Wh for multi-cell batteries.
Question: Should I apply 20Wh limit also for cells in multi-cell batteries?
Example: ...
- 143
3
votes
0
answers
388
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
3
votes
0
answers
1k
views
Power use question for a trail camera
I am trying to calculate how long that a trail camera can be deployed before the batteries run out. The trail camera in question is a Reconyx HyperFire 2.
Here is a useful review of the trail camera ...
- 175k
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 ...
- 17.9k
3
votes
0
answers
2k
views
UL Testing for low voltage battery powered devices
Is UL Testing needed for a 3.6 V battery powered device that is totally enclosed in ABS platstic with no electrical terminals outside?
3
votes
4
answers
149
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 ...
CommunityBot
- 1
3
votes
1
answer
875
views
Proper way of designing a battery backup system with 12V/5V dual output AC power supply?
I have a project (doorlock) with MCU / LCD / Keypad and solenoid (lock) connected together. MCU, LCD and Keypad runs at 5V while solenoid runs at 9V to 12V. I'm currently powering the system with an ...
CommunityBot
- 1
2
votes
0
answers
109
views
Powering a microcontroller with an Li-ion Battery --> How to choose a protection?
The introduction
I'm currently working on a low power project that is using the ESP32-S3 microcontroller variant from Seeed Studio, the XIAO Series ESP32-S3 (Official wiki: https://wiki.seeedstudio....
- 8,561
2
votes
0
answers
33
views
Why would a battery have a declared "LSL" ("lower service limit"?) for internal resistance?
LG's spec sheet for the BL-42D1F lithium ion battery (that's the battery that goes with their G5 phone) states:
...
- 153