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Questions tagged [lithium-ion]

Questions regarding Li-ion batteries (Lithium-ion), including proper charging and usage.

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2answers
164 views

36V Li-ion Charger - how do we make it actually work? [closed]

I have a Hitachi Li-ion charger (without the case) that suppose to charge 10 18650 cells in series (hitachi powertool battery made of 10 high drain cells). That's an official 36V rating of the charger ...
0
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2answers
272 views

Wake-Up Dormant Electric Motorcycle Battery

I have a 2010 Zero DS electric motorcycle with a very depleted battery. I estimate it has been off charger for approximately 1.5 years. The bike has been stored inside a garage in a dry environment. ...
1
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3answers
1k views

What's inside power bank car jumper

All powerbanks that have car-jump function have some thingy between the clamps and powerbank socket: What's inside that thingy? The manufacturers typically claim 300A of starting current for ...
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1answer
410 views

Is it feasible to use powerbank for 100W speaker

I'm going to assemble portable speaker system, think street musician or small open-air party. It needs to run for 2 hours. 100W-rated RMS speaker is enough from my experience, from same experience it ...
0
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1answer
530 views

DW01 Over current Voltage? [closed]

I am using the DW01 in one of those tp4056 & DW01 lithium-ion charging and protection boards. I was trying to figure how much current I can pull until the protection trips/ One small problem the ...
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2answers
42 views

Li-ion Battery Protection - Recharging

This might be a dumb question but: If you have a Li-ion with a built-in protection circuit, and you discharge it until it cuts out (3V?), can you still recharge it? Is the protection circuit to ...
0
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3answers
132 views

33 LEDs in parallel over-heating unprotected Li-Ion Battery

I'm flummoxed. I have 33 LEDs (17 "lagoon blue" and 16 white) wired in parallel on 22 AWG stranded stereo wire. Blue LEDs have 20 ohm resistor in series, white have 27 ohm. The circuit has a slide ...
1
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1answer
568 views

Is it possible to power STM32 Nucleo Boards from a 3.7 Lithium Ion battery?

I have a Lithium Ion Battery that produces 3.7 volts and i would like to use it to power my STM32L476RG Nucleo board to collect data on the ADC and push the data to SD Card. I understand that i can ...
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2answers
503 views

Best way to power a 12V-2A load using 18650 Li-Ion batteries

I would build a small present for my friend's child who has a 3D pen like this: 3D pen link By now it only works with an AC-DC adaptor, so it always requires a wall plug. My idea is to build a ...
0
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1answer
79 views

is this li-ion battery still safe to use?

While replacing my phone's screen I seem to have scratched and maybe damaged the battery. I don't know much about li-ion batteries so I'm wondering if it's still safe to use, or if I should look for a ...
-1
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2answers
115 views

Switching Between Two Power Supplies Without Reverse Current

I'm new to electronics, so I'm bound to have gotten something wrong. I'm designing a basic sensor and want it to be powered by USB by default, but use a lithium polymer battery when not connected via ...
1
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2answers
290 views

CGR 17360 negative voltage

I have disassembled a battery pack for an old (2007-ish) Panasonic camcorder. The battery pack would not charge, so in the interest of pyromania science, I decided to try to learn what's up. The two ...
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0answers
33 views

Help to understand Li-ion batteries discharging current

I have a Li-ion battery which its specifications are the following : Standard discharging current (constant) : 600mA. Fast discharging current (constant) : 20 A Nominal voltage 3.7 volts. I want to ...
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votes
1answer
74 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 ...
4
votes
2answers
156 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. ...
5
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3answers
397 views

microamp constant current sink

I'm trying to put together a constant current sink circuit for discharging small Lithium-Ion coin cells. I need to be able to sink from about 200 uA to 12 mA. My first thought was to use some voltage ...
2
votes
1answer
914 views

Charging Li-Poly Battery with Small solar panel

I have Li-poly battery that is 4.2V 2000mAh with a protection circuit. I have solar panel that is 5V 250mA. The aim is to charge the battery to maintain a fully charged battery, so it really ...
4
votes
1answer
146 views

Li-ion power supply with a charger, a booster, and a pMOS high side switch

I am designing a circuit board for a small mobile robot and there is a problem with the power supply. The circuit is powered by a 1-cell Li-ion battery (VBAT) and includes a charger (MCP73831/2), a ...
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0answers
57 views

Charging two lithium ion batteries in series connection individually

Any idea to charge two lithium ion batteries which are connected in series each one gives out 3.7 volts (both to give out 7.4 volts) individually? What's the main idea or circuitry to do the task ? I ...
0
votes
1answer
860 views

Is this charger suitable for a 18650 battery? [closed]

I'm not really into Electrical stuff and this is the only place where I can ask this question and get a nice and described answer, basically I'm lookin for a good Charger/Discharger for a couple of ...
1
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0answers
108 views

Self-charging robot safety considerations

I have made a 3S5P (18650 Sanyo NCR18650GA 3500mAh with 10A discharge rate) battery pack (about 220 watt hours when fully charged) for a robot. I'm using a BMS with balance (supports up to 60A ...
1
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2answers
63 views

Can I replace a cel in a Li-Ion pack with a different cell?

My laptop battery is composed of 6 polymer cells in the constellation: 3 parallel pairs in series. All cells are Coslight CA653495: 3.7V, 2,4Ah. I'm considering replacing one of the cells, which is ...
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1answer
272 views

What Caused Hoverboard Lithium Ion Fires? [closed]

Purpose of this question: In the interest of making my own BMS circuit designs safe and robust, i seek to understand causes of BMS failures in known systems. I'm not seeking consumer advice or ...
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0answers
323 views

Can i use a separate Balace board with a BMS?

I have a CF-6S12A BMS board that does not have balance...Is it possible to use a hx-jh-008 board for balancing the pack? and to charge it i wondered if it's possible to charge the pack with a 22V 2.7A ...
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0answers
219 views

17670 lithium ion cells

I took apart a very old laptop and the cells I found inside the battery were 17670 (the full name is SF US17670GR). I was planning on using them for a DIY power bank from aliexpress, but the industry ...
3
votes
1answer
92 views

Is it safe and efficient to charge a Li-Ion cell from mixed alkaline cells?

I’m a live sound engineer by day and very novice electronics hobbyist. Hoping for some advice on a small project I'm attempting. Although the use of rechargeable cells in my world are becoming more ...
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0answers
178 views

3.7V to 5.2V 2A DC/DC converter

I need a circuit that can constantly provide 5.2V 2A from a single Li-Ion cell. I looked for boost converters already, but I struggled to find one that fits my needs (most can't deliver 2A constantly ...
1
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2answers
1k views

Li-ion battery life after being 'completely' discharged

If the voltage of a lithium-ion cell drops below a certain level, it's ruined. Lithium-ion batteries age. [Source] As an owner of quite a lot of expensive mobile devices (lots of Apple stuff for ...
1
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1answer
55 views

Designing a Li-Ion equivalent USB powered circuit

I'm trying to replace a Li-Ion battery powering a device with a USB cord directly connected to my PC. Which design parameters should I consider in choosing the right components? I only took in ...
2
votes
2answers
879 views

Why do most battery protection circuits have 2.5V discharge cap?

I was looking for a battery charge- discharge circuit from ebay, and most if not all, state to have overdischarge protection voltage at ~2,5V. Isn't this way too low? By my knowledge Lithium batteries ...
1
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1answer
53 views

Can I use LC 16340 batteries to power a Raspberry PI 3 B

A long time ago I accidentally bought a bunch of LC 16340 lithium ion batteries that have been recently wasting away in my office. I am not big into EE but what I think I know is I need a discharge ...
2
votes
1answer
106 views

Charging Li-Ion string with cells of different capacities

I was trying to understand what is the worst case scenario of using a string of 4 lithium ion cells (18650 cells, 3.6V nom) in series to form a battery pack, without balance circuitry, to understand ...
0
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1answer
112 views

How to remove folded battery from phone without starting a fire?

I was trying to replace the battery in my phone, but since it was very well glued to the phone, I accidentally folded it in half. This immediately caused some dark brown smoke to come out from it, so ...
2
votes
2answers
4k views

How do I boost charge a dead 3.7v li-ion battery?

I have a dead Li-ion battery from a Wifi device. Since I didn't use it for a couple of months, Its dead now. I have read somewhere that boost charging is used to charge and bring the battery back to ...
1
vote
1answer
119 views

Charging 4 Li-ion cells in series

I am trying to recover the use of an old cordless drill by replacing the Ni-Cad batteries with Li-ion. I have removed the 10 x 1.2V Ni-Cad cells that were wired in series with 4 x 3.7V 4200mAh high ...
1
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1answer
520 views

Can i charge 18650 single cell using buck converter?

I get some 18650 cells from old laptop battery. Cell voltages are good and seems healthy. I want to use this cell as a battery pack for some of projects. I add protection circuit to prevent short-...
0
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2answers
513 views

Li-ion charger circuit with LM339N

I recently found a dead laptop battery and disassembled it, found 6 batteries of CGR18650. So when I checked with them my multimeter, they had quite bit of voltage. So I decided to charge them, since ...
1
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2answers
309 views

Solid State Flasher controlling other Relays

I'm a freshman computer science major, and I still have a lot left to learn in the realm of circuitry, but I have a decent understanding of the fundamentals. I have made an electric bike, and I ...
10
votes
3answers
5k views

Is it safe to discharge Li-Ion to 0V?

first of all: I know that a completely discharged battery is damaged permanently. I know it experiences irreversible chemical changes. I know it might blow up if you try to charge it. But that's not ...
0
votes
2answers
126 views

Open Drain Output to Microcontroller?

I want to check my Li-ion Charger( Microchip MCP73833 ) status with nRF52832. So i will connect Stat 1,2 and PG to nRF But MCP73833 have an open-drain output If i connect pins to nRF without Pull-...
0
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0answers
133 views

Lithium polymer/ion battery in parallel

Is it possible to put Lipo/Li-ion batteries of different capacities in parallel? I am aware that putting anything different in series/parallel isn't the best option, but design limitations do not ...
1
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0answers
399 views

SIM800l power-up problems

The datasheet of the SIM800l claims that currents can peak to around 2A during SIM registration and other network intensive activities. I tried powering up the module with the 5v output of a FTDI-USB ...
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votes
1answer
385 views

How to boost convert a LiPo battery to double or triple its voltage, while still charging at original voltage? [closed]

I have a high resistance load (50k) that I need to pump ~0.2mA across. So basically, I need to put 10V across this load. It's an interesting situation because the voltage needed is quite high but the ...
-4
votes
1answer
197 views

16v 26,400 mAh battery pack or 12v 35,200 mAh battery pack [closed]

I am creating a Li-ion battery pack that will allow me to charge my LiPo batteries when I am out in the field flying. I currently have 48 18650 Li-ion batteries that I am using for my pack and I ...
0
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1answer
99 views

Battery life when using voltage booster

I have connected a 3.7v-4000mah battery to a load via a voltage booster MT3608 (3.7V to 12V) . load current is 100ma. how long does battery can work?
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1answer
107 views

Solar, battery, and load circuit

I'm looking to use a solar + lithium ion battery combination in order to be able to continuously power a Raspberry Pi. I have found an MPPT solar battery charger, which will output a fixed voltage. ...
0
votes
1answer
206 views

How much current to charge 4S2P LiIon?

I have a 4S2P Lithium-ion battery for my quadcopter. I'm charging it with the Imax B6. I would like to ask what would be the suggested charging current for the battery pack with the 4S2P setup? Thanks!...
0
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1answer
461 views

How to make Li-Ion mimic NiMH voltages

I'm trying to replace the old NiMH Roomba battery with a bunch of 18650s recycled from old laptops. Lucky enough Roomba uses 12s NiMH battery, that operates in voltage range 12-18V, and has quite ...
3
votes
1answer
175 views

Standby power using a lithium cell

I have an application for a backup power supply, which requires guaranteed energy available, but very infrequently, think burglar alarm. I would naturally gravitate towards lead acid as it has a well ...
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0answers
121 views

VBAT transistor switch is unsymmetrical

Hei, In relation to my other topic for the VBAT cutoff circuit, I have now gotten my hardware back to measure the functionality. What I have encountered is that the switch-ON is as planned ~2.3V, ...