Questions tagged [lithium-ion]

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

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46 views

Charging Lead Acid batteries and Li-ion alternatively using the same charger without losing the power

I only have one good charger. I can regulate the voltage, the current, the protections ... The idea is this. Depending on the state of the batteries I'm going to choose to either charge Lead acid or ...
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1answer
79 views

Using Buck Converter as Solar Charge Controller ? (see pic)

Can I charge Li-Ion safely by connecting PV Panels to a CC CV Buck Converter then through BMS to a 3S3P batteries? This is basically a plan for a very small solar powered device that takes in solar ...
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30 views

Charging 18650 cells with LM2596 [closed]

I have 18650 (UR18650F) cells I would like to charge using a LM2596 DC-DC Step-down Adjustable CC/CV board, which has 3 adjustable pots. The instructions on using it for charging are as follow (quoted ...
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25 views

How do I prevent my BMS from tripping when solenoid is connected?

I am working on a project that is effectively just a battery powered reticulation system. It is charged through a solar array and cheap MPPT charger, which connects into the battery via the BMS. The ...
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1answer
34 views

Is it possible to chain BMS modules?

Let's say i have two 6S Lithium BMS modules (basically protection and balancing) and i want to create a 12S battery pack. Is it possible to chain the power lines of said modules? Just curious
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18 views

Lifep4 BMS and control

Any Lithium battery experts here? My concern is that there is a lot of work and specialized chips on BMS systems that specialize in balancing battery cells for large batteries. Lets say I have a ...
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2answers
26 views

Chaining TP4056 modules, the proper way

I know a similar question was asked before, but still, it didn't aswer what I'm looking for. I need to charge a series of 6 Li-ion cells, and maybe 12 in the future for a voltage hungry project. Since ...
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1answer
30 views

Should there be a clearance between a lithium polymer cell and a charging circuit?

I'm building a compact portable console that is going to use a 500ma charger board from Adafruit and possibly a 5v 1a boost as well. Past experience has taught me the chips on those little circuit ...
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36 views

Give a second life to a 18650 battery cell, which has 0.1 V?

I have a 7.4V battery pack consisting of 2 x 18650 cells. One of them has 3.4 V, so I tried to charge it with a good old TP4056 board, and it worked: The second 18650 cell seems nearly dead with ~ 0....
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48 views

Would this design for Li-Ion cell protection+balancing circuit work?

My team and I are currently trying to design a 2S2P battery pack for use in a CubeSat (student project). The pack is planned to be used with 30-40% depth of discharge for a total of around 5800 charge-...
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28 views

Integrating 12v “ups” to a portable fridge

I want to make a portable fridge more portable with Li ion batteries and I'm thinking about how to connect all the pieces. Load is rated for 12V 5A / 24V 2.5A, there is AC/DC SMPS that outputs 13.2v ...
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43 views

Individual cell balancing on multiple packs

UPDATED: I edited my question to clarify I'm building a 4s4p pack with 18650's. What is the best method to achieve on a per-cell balancing & protection if that makes sense? Most of the 4s BMS I ...
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67 views

Connecting 4 18650 batteries in series without bms

I have 4 batteries (18650) 3.7 volt each and i want to connect them in series to get around 15 volts, can i do that without having a bms? Just directly connecting them together? Note: i do have a ...
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34 views

How to tell a battery is LiPo or Li Ion (based on apperance)?

I have this battery and I don't know it is lipo or li-ion: Is there any way to tell a battery is lipo or li-ion based only on apperance?
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1answer
78 views

Li-Ion UPS for a 12V 1.5A Router

I know this question has been asked quite a few times on this site. The closest one i could find is: make-9v-ups-for-router-with-tp4056-and-mt3608. While there are UPS systems designed for routers, in ...
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24 views

Strange behaviour of TP4056 when charging complete

I am using a TP4056 to charge a 18650 LiIon cell as shown in the circuit below. The BAT output is connected to the 18650 cell through a BQ29700 protection IC. According to the datasheet of the TP4056, ...
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35 views

Lithium ion pack showing 0V after BMS/protection circuit but pack is actually 40V

I recently purchased an electric skateboard and I ended up having some issues with the board turning off as soon as it started to move. I figured that there was an issue with the lithium ion pack so I ...
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3answers
116 views

Can we do better than CCCV charging?

For some background, most if not all modern charging solutions for lithium ion batteries use a CCCV model for charging: As the diagram explains, we charge at a constant current, and then "...
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1answer
32 views

Can i charge an LiFePo4 32650 cell using an 18650 li-ion charger

i have this li-ion 18650 charger i found, pic attached below. I need to know if i can use this to charge a LiFePo4 32650 cell i bought here, the cell doesnt fit in due to the obvious differences in ...
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18 views

Resetting Li-Ion battery protection PCB without disconnecting the load

Given is an 18650 Li-ion battery with built-in protection PCB. It is used to power an electrical load and can be charged by a dedicated Li-ion battery charger. In the schematics below, the battery is ...
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1answer
36 views

Li-ion built-in vs external protection

Many Lithium Ion batteries have an internal chip (a protection circuit I guess). Are External protection circuit (like the TP4056) really necessary due to internal chip? I can't find the answer on ...
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35 views

4S Lithium Ion Low Votlage Cutoff

Disclaimer: I'm not an electrical engineer, and most of what I've done so far has been from researching similar designs on the interwebs. I'm just a tinkerer with a soldering iron, so please excuse my ...
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1answer
27 views

max Discharge current of li-ion battery (temporary)

Is my assumption correct that the main limiting factor of maximum discharge current of a Li-ion battery is that the cell heats up too much due to its internal resistance/the current flowing through ...
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1answer
21 views

Lithium ion battery pack charge current

I am designing battery charger and I want to know how to calculate max charging current for a lithium-ion battery pack. I am using Texas Instrument Chip bq24616 and their evaluation board. Assumption: ...
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2answers
51 views

Charging batteries with a PCB Charger

I have a 4 slot battery holder with 2 wires coming out of it, best I can describe it. I'm planning to get a 14.8V Li-ion PCB charger (of course this will be used with 3.7V Li-ion batteries). One thing ...
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32 views

Replacing a Li-Ion battery with a capacitor and power supply in a bluetooth speaker

I have a Philips BT3500 speaker with a dead Lithium Ion battery. I want to be able to use the speaker without the battery - using just the power supply. It used to work for some time with the usb ...
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41 views

Li-ion battery charging circuit [duplicate]

Please I have some couple of 3.6v 3Ah cylindrical li-ion battery, but since I bought them, charging it became a huge problem. I first connected a single one to a 2A infinix phone charger (made in ...
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52 views

Charging 3S Li-ion pack over USB

I’m making a portable Bluetooth speaker and need some help with how to charge the battery pack. I have made a 3 cell Li-ion pack with a BMS to get a 12V battery for the speaker. My thought was to ...
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33 views

How do I conduct an experiment to find the discharge curve of a lithium ion battery?

I want to conduct this experiment with a multimeter only. What sort of load do I put? I used a Sony Li-ion Np-BPL battery model and after full charge, I put the battery across a load of 1k Ohm; ...
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2answers
86 views

Same mAh, same volt - different current

I need to replace the 18650 battery of one application. The battery doesn't have any marking about volts, mAh or amperes. Because it's 18650, the voltage is fixed - done. mAh - will use 2000mAh (let'...
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1answer
29 views

Dead Battery Voltage and its Charging

How can we say a battery,say Li-ion battery, is dead when it is 2.8V itself instead of 0V? How can the 2.8V not give current? What is happening? This question, is applicable to all other batteries ...
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19 views

Calculation of Initial Charge Deficit and Initial State of Charge

I am working on Simulation Model based Lithium-Ion Battery Development with MATLAB/Simulink. For the battery model, I need to define Intial Charge Deficit , which is a phenomenon which every battery ...
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1answer
26 views

Calculate lifespan of BLE ESP-32 module

I have purchased an ESP-32 BLE module. I have programmed it to turn on to broadcast a Bluetooth text to my phone and then enter the deep sleep mode. Then continue this loop. When the Bluetooth text ...
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40 views

Small powerbank, li-ion cell charging voltage problem

While ordering a replacement for an 18650 cell from a small powerbank, I've overlooked an important property of the battery. The old, broken one had 4.35 charging voltage and this is what the internal ...
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1answer
45 views

Is the process of adding new parallel (matching) cells into an already built battery pack safe?

I just built a 5p13s 18650 li-on battery pack with a bms. I realized after the build I add more of the same cells (all new), so I could have built a 7p13s instead. Is it possible, after setting the ...
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1answer
34 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 ...
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1answer
112 views

Lithium Battery Charger using LM317

I have come across the following circuit in a datasheet for a battery charger: I have also seen a similar use of the charging circuit for use as a lithium battery charger, e.g http://shdesigns.org/...
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44 views

Proper algorithm to charge LiPo batteries

We are going to develop a new LiPo battery UPS circuit for our handheld. I have read couple of articles and almost all of them recommend to charge the battery based on the following curve. I have also ...
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1answer
37 views

How to protect each cell connected in parallel in a Li-ion battery pack

I am making a 1S2P Li-ion battery pack. One of the requirement is I need to protect over-charge and over-discharge by detecting the voltage of each cell. The protection circuit/IC should interrupt the ...
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1answer
66 views

Make 9v ups for router with TP4056 and MT3608

I am building 9v UPS for my wifi router using TP4056 lithium-ion charging module and MT3608 stepup converter. If USB power is available I want MT3608 to get power from USB (TP4056 Vin Pin) otherwise ...
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20 views

Charger says 5-cell li-ion battery at 17.7 volt OCV dead or deeply discharged, what could the cause be?

I have a lawnmower with two lithium-ion batteries. I charged them after sitting during the winter period. One battery charged happily to 19.15 volt open circuit voltage (OCV), whereas the other had ...
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4answers
230 views

Undervoltage protection strategy for Li-ion batteries

We are using a Li-ion battery with built-in safety PCM (Enix MGL9070), a gas gauge to monitor the battery voltage (STC3115A from ST) and a battery charger (bq24133 from TI). To protect the battery, ...
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56 views

what is maximum Input voltage for 2s bms

I am making UPS for my 12v broadband router. I am planing to use XL6009 boots converter to booter 8.4 volt to 12v. For charging 2s Li-ion battery with 2s BMS i don't have 8.4v charger. Can I use 12V ...
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22 views

Detect Battery Insertion in USB Charging Circuit

I'm using an MCP73831T as the charger IC, I've figured out how to detect the charging/charged, this was easy, however, I would like to know when the battery is actually plugged in, I know when the usb ...
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49 views

18650 battery holder: SMT or THM for 15A?

While looking for a quality and high current (max 15A) 18650 Lithium battery holder, I've found that Keystone offers: Surface Mount Style with contacts of stainless steel and "gold flash over nickel ...
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1answer
27 views

Do I multiply charge current by number of battery packs when charging in parallel?

Im trying to charge these 1S3P LiIon 18650 Battery Packs with this battery charger using this parallel connect plate. Can I just multiply single pack charge current by however many battery paks I ...
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45 views

Solar Li-Ion Charging with load-sharing

I need some help regarding my project. I have made a dog feeder with Arduino Uno, which is powered with a 3000mAh Li-Ion battery. I want the system to be charged with a solar panel (more solar panels ...
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22 views

Additional battery in parallel (Li-ion)

So, im trying to figure out how to wire in an external battery for my computer electric scooter for more range. I messaged the manufacturer but only got a concluding message of the factory workers ...
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35 views

Testing old lithium cells with Zanflare chargers, second test shows more capacity?

I've been salvaging 18650 cells. The first I salvaged was from an old laptop battery that has been laying around for a year or so. It was still good, as far as I know - the laptop was just no longer ...
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42 views

Can I use Li-ion in series to power a 12V motor?

I'm investigating options to power a small trolling motor, which is designed to be used with a 12V lead-acid battery. My main constraint is weight, and from the research I have done so far it looks ...

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