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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
52 views

How to use CC/CV Charger with a DC/DC converter

I am searching for a solution to charge a battery pack (7S1P)[ICR18650] with a charger with CC/CV mode and I have a BMS for protection (I've done research to maximise the security of the battery pack)....
0
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1answer
32 views

How to deactivate Li-Ion battery charger

I have a USB device, which does have a Li-Ion internal battery in it. The device charges the battery when plugged into a socket. However, I don't want that battery to be used at all, I do prefer that ...
0
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1answer
40 views

Is less than 1A enough for TP4056 module to charge one battery?

I want to charge 3 separate 18650 cells with one charger. Each one of the batteries has their own TP4056 module. So in total there are 3 TP4056's. I know that TP4056 is rated at 1 amp input, though my ...
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1answer
30 views

Using TP4056 module to charge battery while load remains connected

I need a circuit that utilizes the tp4056 breakout board to power a NodeMCU ESP like so: tp4056 USB port connected: 18650 battery charging and NodeMCU running of USB tp4056 USB port not connected: ...
0
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1answer
26 views

LTC 4150 coulomb counter property

I want to monitor the capacity of a 7.4V, 2200mAH Li-ion battery. I have found a that LTC4150 coulomb counter can able to measure the battery capacity. So, suppose I have connected a fully charged ...
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2answers
60 views

Calculate the Li-ion battery remaining capacity

How can I calculate the remaining capacity (exact or approx value) of a Li-ion battery by measuring its voltage. The battery is connected the load and i know only the battery voltage and the value of ...
8
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1answer
1k views

Is it normal for a lithium ion battery to read with a very low voltage on a multimeter?

I have a PS Vita and I suspect the battery is dead and needs replacing, as the Vita won't charge at all. But the issue could also be the charge circuit, as when plugging it in to charge the charging ...
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1answer
36 views

Rechargeable battery datasheet

Some parameters on the datasheet are a little bit confusing. What does the datasheet mean?
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0answers
36 views

How to charge Lithium Ion with protection circuitry

I am trying to build a charger for the Ctr 003 battery for the Nintendo DS. This battery has 3 outputs, which I call +, 0, and - for simplicity. When I measure voltage from + to -, or from + to 0, I ...
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0answers
32 views

Understanding MOSFETs Driven by Analog vs. Digital Signal

I plan to run a circuit with two 18650s in parallel to get 7Ah of capacity and a 3.3V rail (for running the ESP32 MCU). I'll use an LDO to get my 3.3V until the battery voltage drops to 3.3V. At that ...
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1answer
31 views

Replacement battery voltage mismatch tolerance?

I want to try replacing a proprietary battery in an electronic of mine as a first electronics DIY project. Thing is, the stock battery is 3.6V, and the phone battery I have on hand that I would like ...
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3answers
58 views

Can I put Li-ion batteries in series and discharge them at different voltages?

I need to run a pump (drawing 95mA at peak flowrate) at +14V and the rest of my circuit runs on +3.3V. To save on battery costs, I was thinking of purchasing four 18650s at 3.6V 3500mAh per cell and ...
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0answers
63 views

Samsung Powerbot Vaccum - bypass charging dock?

I have a Samsung powerbot VR9000 robot vaccum. It has 2 contacts on the bottom of the robot and docks with a 'charging station' when it is low battery. The charging dock does not charge it at all. It ...
0
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1answer
35 views

Reducing the start-up voltage of a low voltage cut-off circuit

I just built this circuit, with the intent to use it as a low-voltage cut-off switch for a single li-ion cell. It works great, but once it's triggered it needs about 7 volts to turn back on, so I ...
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0answers
73 views

What is the blue wire for on my battery? (samsung galaxy note 10.1)

I have this battery out of a Samsung Galaxy Note 10.1 and this battery has 5 wires; 2 black, 2 red and 1 blue wire. I assume that the red wires are positive and the black wire negative charge. I've ...
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1answer
43 views

3.7V Li-Ion battery powered LED step-up/boost driver

Most quality COB LEDs are driven with around 35V. Are there any quality constant current step-up drivers available that allow a 3.7V Li-Ion battery to be used? Or would I have to use TI's WEBENCH ...
0
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1answer
53 views

Laptop chargers that say 20V, are they for charging 5s?

I understand that 5s Li-ion should be charged at 21V (4.2*5) however the only laptop chargers I can find are 19V, 20V, and 24V. Each is relatively close to the value that should be used for 4s, 5s and ...
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1answer
70 views

Mixing Lead acid and Lithium ion in series, after charging them separately

Can I connect a Lithium ion battery battery pack with a Lead acid battery bank; in series. I will charge both separately cells strings separately (not to mix the chemistries) before putting them in ...
2
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1answer
56 views

Best way to connect 7 x 18650 Panasonic batteries to 2 LEDs

Looking for some help with correct wiring: I have created a custom 7-cell battery (4 cell block in parallel, 3 cell block in parallel and both blocks connected via series) to produce a 7.4V 23.8A ...
2
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0answers
15 views

Context of Li-Ion MnO2 “Cell Configuration” Specification

My application supports variable pack configurations: 4S4P, 4S6P and 4S8P. Each one obviously uses a different BMS profile, and other minor changes such as charge/discharge MOSFET and fuse selections....
0
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1answer
94 views

TP4056 and li ion battery charging that never ends

I have designed a circuit with a Nodemcu ESP8266 (something similar to an arduino nano, requiring 3.3V to work) and I would like to have a backup battery to be robust to main power interruptions. So ...
0
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1answer
10 views

Is a bq2920x enough to protect a two-cell Li-Ion battery?

I'm designing a battery supply to go into a bluetooth speaker. Having never worked with Li-ion cells before, I've done some research and understand that they need to be load balanced and protected ...
0
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1answer
31 views

Emulate Li-ion battery using a charger

I bought an iPad with dead battery (it’s bulged). When I connect it to a charger, the only result is a boot loop (Apple logo, blink, Apple logo, blink…). I want to use it as a kind of picture frame, ...
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0answers
23 views

Li-Ion protection IC starts in overdischarge mode

I have a problem with my Li-Ion protection IC. When connecting a charged battery with a 3-4V voltage I expect that the IC will start working (there is no problem with the voltage levels). For some ...
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0answers
23 views

Why in consistent current for multiple TP4056 module in parallel?

I'm trying to make a charging station that charges multiple batteries independently, something like so. NOTE: THE POWER SUPPLY IS AN ADJUSTABLE BENCH POWER SUPPLY, I ACCIDENTALLY LEFT IT AS 1V. ...
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2answers
112 views

Two 5V2A powerbanks draw different current under same conditions?

I have 2 different powerbanks, both have 10000 mAh and both are rated for 5V 2A power input. I have noticed that they draw a different amount of current despite using the exact same charger (5V 3A), ...
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1answer
53 views

Using B0505 for connecting phone chargers in parallel

I am planning to charge four 18650 Li ion batteries that are connected to four TP4056 in parallel making 4 amps in total to charge them in their usual rate. I was thinking of connecting two 2 amp ...
0
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1answer
20 views

TP4056 to charge xS1P li-po li-ion

Very related to this question. While it's already clear that several TP4056 can't be used to charge and discharge several cells, it's not clear to me if it's possible to only charge a battery pack ...
0
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1answer
61 views

Li-ion battery pack from non- identical batteries

I'm building a battery pack for my portable speaker, and I'm using a random collection of second hand Li-ion cells. I'm going to have cell phone batteries with differing capacities and also 18650 ...
0
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1answer
32 views

Can I charge each Lithium ion battery, that are connected in series, with individual charger?

I don't know if I can do this and just want to make sure that it can work before I actually test it so that I don't have to worry about blowing my room up... The batteries have the same capacity so ...
3
votes
1answer
63 views

Integrated 5V uninterruptible power supply (UPS) with a lithium cell?

I'm trying to figure out the best way to implement a UPS for an embedded system that runs from a 5V supply. Essentially the system has a 48v to 5v, 1.2A output DCDC converter that powers my system. ...
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2answers
60 views

Does minimizing full-charge time for Li-ion batteries increase their longevity? [closed]

If the stock charger for my smartphone causes the Li-ion battery to be charged in a couple of hours and I charge my phone for 8 hours a day (while I sleep) resulting in about 6 hours of full-charge ...
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2answers
40 views

Li-ion CR2 / 15270 voltage and charging circuitry

CR2 / 15270 Li-ion batteries normally come as 3.0v. I thought Li-ion and Lipo batteries were always 3.7v, how is that possible? Does it require a different charger circuit than normal 3.7v li-ion/...
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1answer
28 views

Li-ion Modded Powerbank Question

So I got this single Li-ion power bank. It's a 18650, and I wanted to add another 18650 in parallel. I want to use the same circuit which produces a constant 5v. Is it safe to do it that way? in ...
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0answers
45 views

What is this “Termination Disable” pin?

I'm just looking at the BQ2407x range of Lithium-Ion charging ICs. One part in the range has an extra pin, TD, which disables/enables "charge termination". Here is the functionality description: ...
2
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0answers
79 views

Is it okay to connect 2 lithium ion battery in parallel to a charger that can maintenance 4.2V? (more detail in post)

So I'm planning to make a charger that can charge multiple lithium batteries in parallel with hope to use recycled one. I fully understand that they are dangerous when you do it incorrectly, so I just ...
4
votes
2answers
476 views

Is Non-Passive Cooling bad for Lithium Ion Cells?

I'm in the process of designing a device capable of charging, discharging and testing internal resistance of 18650 cells. My device will be capable of testing 100x 18650 at the same time, each will ...
0
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1answer
73 views

Convert 36 V lawn mower from Lead Acid to Li Ion batteries - charging / danger [closed]

I have a 36 V lawn mower with a battery container with three 12 V SLA batteries in series. I am thinking about switching to LiIon batteries for more run time (and hopefully more recharge cycles). I ...
0
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2answers
279 views

Correct charging current for lithium-ion batteries

I am trying to replace a lithium-ion battery for my Bose QuietComfort 35 headphones. I cannot find the datasheet for it. The battery is an AHB110520CPS (AHB110520) by Synergy. It is supposedly an "...
1
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1answer
34 views

Balance charging connection for 2 cell li-ion

I am designing a circuit powered using two 18650 li ion cells in series, I will wish to charge it with an imax b6 charger with balance output. Is it enough to connect the 3 terminals of the charger to ...
1
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1answer
56 views

Is it safe to charge single 18650 cells without temperature sensing?

I was looking at 'power bank' circuit boards on Aliexpress, the kind that you add to a 18650 cell to make a basic 5V in/out supply. I noticed they all seemed to be lacking any kind of temperature ...
0
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1answer
56 views

Bad Practice - Charging Lithium Batteries while powering circuit?

I'm using a 2s BMC to charge a 2s2p lithium battery pack (7.4v, ~6Ah). The output of the charging circuit is the same as the input - they're not separate. As a result, when I want to charge the ...
1
vote
1answer
54 views

What’s the max instant current draw from a Li-Ion protected pack?

I’ve been looking for this and couldn’t find the answer so far. What’s the max current that those Li-Ion video camera protected battery packs, as the Sony NFP-550, NFP-970 can handle? I know for ...
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0answers
51 views

Charging multiple batteries with TP4056 witht battery protection

I've searched the archives but none seemed to be similar to my situation. So based on my poorly drawn diagram, all batteries will be in parallel. I will be using TP4056 with protection and was ...
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0answers
25 views

Battery capacity for optimal life

I am planning to construct a small electromobile for which I will use a 3kW electric motor which will be powered by li-ion batteries. It would be sufficient for the vehicle to run for about 1 hour ...
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1answer
98 views

Battery capacity calculation/method [closed]

While calculating battery power capacity requirement for a circuit consisting of multiple loads having different power consumption, how should one proceed to avoid any error? How it is done in ...
0
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1answer
39 views

Relation between terminal voltage and charging speed in Lithium-Ion/Polymer batteries?

I tested charging a 5200 mAh (20 Wh) battery at 10W. Its charging level at the beginning was 20%. The terminal voltage was 3.68V. Now, I applied 10W of charging rate to the battery. The terminal ...
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0answers
46 views

Does replacing Li-ion accumulator with a pair of good quality AAA NiMH makes light shoes safer?

I bought my daughter a pair of light shoes (LED). Fortunately they broke down after 2 days and she's not wearing them anymore. After buying I realised that they probably have Li-ion accu inside. So I ...
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0answers
73 views

Capacitive discharge excess being used for battery recharging

I am currently designing a circuit similar to a cattle prod that is intended to be attached to a drone. The cattle prod is powered by a lithium-ion battery, charging up a capacitor and then quickly ...
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3answers
78 views

How to connect LED strip to be powered by charger and batteries

I plan on using it mostly plugged in, batteries are there just for extra mobility and won't be used most of the time. Don't know lot about batteries so in first scheme I added a switch (pos. 1 ...