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Questions tagged [lithium-ion]

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

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10 views

How to set up an 18650 BMS with two B- leads?

I'm building a 7S2P 18650 li-ion battery pack. I have this 7S BMS that has two different leads labeled B-. There is a thin black wire as a part of the balance connector; this is pretty typical, ...
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1answer
19 views

Full charged battery age

I design a schematic for a alarm device. I use a trigger IC use 40nA and i want to use a 2500 mAh Li-Ion battery. The device is used at outdoor (-20/60 C) at least 2 year. I want to ask that a fully ...
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106 views

How bad would it be for a NiMH battery or/compared to a Lithium-ion battery in a device to sit unused for years?

I have a Sonicare toothbrush which has Lithium-ion battery and a body hair trimmer that has a NiMH battery. I have charged the Sonicare once or twice without ever using it, just to stop it go to 0% ...
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46 views

How can I evaluate the condition of used lithium ion batteries?

I am coming into possession of hundreds of 18650 batteries. They are used, but initial checks indicate over 90% of them are good batteries. I would like to discharge, charge, and measure capacity of ...
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44 views

Lithium ion batteries [on hold]

If mobile chargers give output of 5V DC supply to phone Li-ion battery which has maximum charge voltage of 4.2V at full charge and phone has internal circuitry to protect the battery from overcharge , ...
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30 views

Charge and power distribution circuit with multiple batteries

I’m looking for solution for electric vehicle charge and power distribution system PCB. For some reasons I want to split battery to several Li-Ion packs in separated units (hulls). I see the next ...
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69 views

Where is the voltage drop? / How can I test circuit this without using an actual battery?

I've put together the following circuit, it's just a rechargable LED torch, just to try load sharing: simulate this circuit – Schematic created using CircuitLab BAT1 is a LiPo battery, 5.2 V ...
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43 views

I wonder how I should have a backup cellphone always on, always charged almost never used [closed]

I wonder how I should have a backup cellphone always on, always charged almost never used. Today we have this for emergency in and out, it stays in the charger and are as good as never used. After ...
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1answer
33 views

Charging li-ion cell using constant-voltage

I need the li-ion battery for power failure backup on an old phone used as a sip-phone. The battery needs to keep it running less than 15 minutes so far from full is OK. The old battery with ...
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38 views

Will the BQ2970xx IC do everything I need for Li+ battery protection?

I'm modifying a circuit to use a rechargeable 1S LIR2032 coin cell battery. This is my first time using Li+ and understand I need to add circuitry to protect the battery/circuit. My specs are: Max ...
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1answer
32 views

Should I charge an in-series 6-pack of Li-ion batteries at 4.2v 1A or 25v 1A?

I have a 6-pack of 18650 Li-Ion cells connected in series, so it gives around 22v dc output. To charge a single Li-Ion cell I need a 4.2v 1-1.5A charger, simple stuff. But to charge the whole 6-pack, ...
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52 views

How could i connect a 18650 Lion to be able to supply my embedded device while charging?

I'm designing an embedded device that should be always connected to a solar panel to regularly plot his V-I curve.I will embedd two(2) 18650 Lion battery for the autonomy. So to control and protect ...
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2answers
68 views

How to calculate a lithium-ion battery's discharge time at a specific load?

How do i calculate the discharge time for an lithium-ion battery at a specific load? Let's say i have a lithium-ion battery with a nominal voltage of 3.7 V, a cut off voltage of 3.0 V and a nominal ...
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137 views

Why are there 2 connectors on li-ion batteries

I'm looking at just about any assembled li-ion battery pack for sale and they all have 2 connectors coming out (4 wires total) and I'm wondering why is that?
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47 views

Charging a 4.4v lithium polymer battery with 5v?

Can anybody tell me how can i charge a 4.4v lithium poly. battery. I have a tp4056 charging circuit, but the problem is that it stops charging at 4.2v. I have searched on Ali but haven't found any 4.4 ...
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1answer
40 views

Identical li-ion packs in parallel

I'm looking for a 1kWh battery at 36V, something around 30Ah should be fine. Browsing popular sites I see that the lower end starts at about $400 which is a bit over what I'd like to pay. I stumbled ...
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14 views

3s 25p li-ion battery pack charging parameters

I'm having a LG HG2 18650 3s 25p battery pack.To charge the pack i planned to use EPEVER mppt charger controller. But for that i have to set the Float charging voltage,boost charging voltage and ...
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1answer
89 views

Are lithium ion batteries damaged by strong magnets?

I'm wondering if it is okay to put a lithium ion battery directly next to a strong permanent magnet. Would this affect the functioning of the battery? Can it lead to early failure? In the worst ...
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1answer
28 views

Charging Li-Ion with BMS and CC-CV DC converter

I'm currently building my own electric longboard and even though I looked through some resources considering this, I am not a 100% sure that I am on the right path. I want to use a 10S2P battery ...
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1answer
43 views

Protected Li-ion batteries charging / discharging in parallel?

since there is no longer good source of high quality pouch flat type Li ion cells, I am considering to use high new smartphone batteries from service packs. I need bigger capacity - about 10 - 20 Ah,...
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2answers
85 views

Is it normal to have 40% capacity after 1.5 years of charging Li-Ion? [closed]

I have a laptop computer that spends 99% of its time plugged in. The last time prior to today I used the computer not plugged in was 1.5 years ago. Today morning, I put the computer to sleep (with ...
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39 views

Why lithium ion batteries explode ? (Reason behind it ) [duplicate]

I heard the reason for lithium ion battery explosion is lithium burns when exposed in air but Few days ago I pierced one of my batteries (10-20 holes) and it didn't explode , why ? It was broken phone ...
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3answers
101 views

Should I stop charging my laptop battery at 50%? [duplicate]

I know that there are lots of questions about battery health and charging, but mine is very specific. For a lithium ion battery, leaving it at full charge (or low charge) damages the battery capacity. ...
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1answer
40 views

Small solar panel and diodes

I am planning to use this small solar panels to charge a 18650 cell with this charger module and power a low power project with it. I've never worked with solar cells, although I have read a lot from ...
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1answer
684 views

How should i charge 3 lithium ion batteries?

I'm new to battery charging and I was wondering. What is the best way to charge and manage 3 18650 cell batteries? The load is about an amp and I have a 3.7 amp power supply to charge them. I'd like ...
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1answer
71 views

Would a small scratch/puncture on a lithium battery cause power drain?

I replaced my phone screen myself and afterwards noticed the battery life was significantly worse. I scratched the battery slightly getting it out as it was firmly glued in. Would slightly bending ...
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1answer
40 views

Charging and discharging 18650 batteries with TP4056 modules via their power output terminals

I'm having those fancy ESP boards that come with a battery input pins/holders that can be connected to a battery to make them portable. They also have a dedicated USB port for charging/sketch uploads. ...
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3answers
128 views

Charging a lithium battery to 4.34 V

I recently came across a device (a headlamp) with lithium-polymer battery, which is marked 3.8 V nominal voltage, instead of usual 3.6-3.7 V. It's charging circuit is based on ME4057D chip, which is a ...
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1answer
28 views

Li-ion custom protection circuit module (PCM) design and de-rating

I am designing a custom PCM (protection circuit module) for Li-ion cells provided by a supplier ( they offer PCMs but they do not meet our RF immunity spec ). The supplier-provided PCMs have a charge /...
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28 views

Li-ion charger (MAX1737) input current limiting

I have been protoyping a 3S1P Li-ion charger for myself and it turned out pretty well except for the fact that I cannot get input current limit to match the expected (calculated) value. In my case (...
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1answer
127 views

Does keeping a mobile phone plugged in increase its battery's lifetime?

As far as I understand, keeping a mobile phone plugged in would draw current from the source (i.e. an USB port) rather than from the battery. Therefore, the battery would not be used as long as the ...
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1answer
55 views

18650 pack building - is it better to have similar batch or similar capacity?

I'm gonna build battery packs. I have quite a lot of experience with 18650 Li-ion cells, but there's one thing I still don't know. I will buy CCA 100 new cells from seller (for example LGEBHE21865). ...
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1answer
85 views

Li-ion Swollen battery dangerous or not?

I have a Wifi AP and its Li-ion battery has swollen so much that its cover cannot be put in place over it now. Its working but its backup time has reduced to 20%. I cannot put on the battery cover ...
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1answer
71 views

How to charge and use a salvaged laptop battery with BMS?

I have salvaged a laptop battery but I have no idea how I can use it like a normal battery. It does have a 10 pins connector but I have no idea what they are doing and how I can use them. Should I ...
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1answer
41 views

Trying to understand Battery Chargers vol.2 [duplicate]

The answer by Bill dubuque was very helpful and got me to read the complete datasheet of MCP73831/2, but there is one thing from the datasheet that I don't fully understand and is the cause of lots of ...
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1answer
35 views

Is it possible to charge Li-Ion Cells in series without a Balance Charger, by using slightly lower 4.1 V per cell charging rate

I have read that it is strictly not recommended to charge Li-ion cell packs in series without using a balance charger. My question is, can a balance charger be avoided by keeping the total charging ...
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2answers
93 views

Is using water to douse a reacting lithium battery safe?

I've been reading on safety protocols on Li batteries and I seem to remember that Lithium itself is extremely reactive to water. However, FAA regulations recommend using water to douse the device to ...
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0answers
55 views

TP4056 - Li-lon Battery Charger enable pin not working

I designed a small lithium battery charger with the IC TP4056 but apparently the enable pin (CE) is not working. My setup is depicted in the following block diagram: Basically the input voltage (...
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0answers
34 views

Can I Charge With An MCP73831?

Sometimes I need to take my laptop places and, it doesn't have the greatest battery life, sometimes maybe it only lasts 10 minutes. So after researching a bit I decided I wanted to build a li-ion ...
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2answers
100 views

Does 1200mAh Lipo battery will kill my circuit? help me to read the data sheet please!

I've found old arduinio project from Gitlab which runs the circuit with Lithium Ion Polymer Battery - 400mAh Unfortunately i wont be able find any Lip 400mAh in my country.Lucky enough i found one ...
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3answers
90 views

What would be the most efficient way of wiring a solar power bicycle?

I have an electronic bicycle; 350 motor that runs off a 17.5 Ah battery at 36 volts. I've just ordered three 12 volt, 150 watt solar panels, that I'll wire in series to total 450 watts; giving 12.5 ...
0
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0answers
122 views

How to connect 3 cell series Li ion charger and protection IC for each cell?

I am using max745 4 cell Li-ion battery charger to charge 3 cells in series. I want to put additional protection IC for each cell (NCR18650pf). Because I need to run the max745 always on as a backup ...
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2answers
156 views

Homemade Li-ion charger

I am trying to build a lithium battery charger (Li-Ion) for charging banks of 6s batteries of varying capacities (2-30Ah) from a varied DC input. Given that I need to supply CC/CV to charge these ...
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2answers
100 views

Please check my solar outlay for Lithium ion battery

I'm in the processes of 'solarising' my electric bike, and would appreciate a more experienced opinion on how I intend to do it. The motor is a 350W running off a 36 volt battery. I intend to get ...
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2answers
104 views

Is there a risk of 18650 li-ion battery explosion in a low current application?

I have several used 18650 batteries from my old laptop battery. They all look OK, I have charged them and discharged. The capacity is around 1700 mAh, nominal capacity was 2500 mAh when new. I'm ...
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2answers
165 views

Lithium ion (Li-ion) vs. Lithium thionyl chloride (LTC) battery?

I need some consultation on which battery of the two to use for the GPS trackers I'm designing. My trackers wakeup when there's movement only so they're not on all the time and they have low power ...
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1answer
61 views

How can I limit the current drawn by a Li-Ion battery pack BMS?

I have a Li-Ion battery pack made with twelve 18650 in a 3S4P configuration, using an off the self Battery Management System (rated for 25A), that I purchased on aliexpress. I tried to charge it using ...
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2answers
62 views

Charging a Li-Po with a solar panel

I'm looking to setup my e-bike touring bicycle with a solar outfit so that it can charge on the road, but am unsure of the electronics. I appreciate the size of the panel will be huge, but this can ...
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3answers
68 views

How to use a gas gauge?

I must have missed an article, lesson at uni, or something obvious because I'm struggling to work out how to write some firmware to use a gas gauge to get out a rough percentage of battery remaining, ...
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3answers
35 views

Dual N-channel mosfet Rdson value

I'm going though datasheets of some dual N-channel MOSFETs for li-ion battery protection, like 8205A or ECH8695R, for some thermal and power dissipation calculations. There are Rds(on) values, like ...