Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [18650]

26 questions
2
votes
4 answers

Is this a good way to make 2S 18650 battery cell while parallel charging?

I want to make a battery pack with 7.4 volt output and I want to charge them with 1A each so I connect them parallelly and input them with 5A 6A DC adapter. (No charging and using at the same time) Is this a good way? Update: I have change my…
Titor Ps360
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2
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1 answer

Repopulating a Dewalt battery, cell choices

I am replacing the 5 each 18650-13B cells in a Dewalt 20V battery. Is it important the replacement cells are "13B" or can I use other capacity cells or any capacity? thanx, Dacattoo
dacattoo
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1
vote
3 answers

TP 4056 + XL6009 for RC cars

Good afternoon. I use 18650 to power the radio machine. An XL6009 is connected to the output of the TP 4056 board to receive 5V, and then these 5V are fed to the machine board. But you press start on the remote control, the TP 4056 board goes into…
Oleg Red
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vote
0 answers

Voltage leak when muxing Li-ion cells for voltage measurements?

A disclaimer before I dive in, I am not working with a battery pack. Anytime I refer to Li-Ion cells or 18650s, I am trying to handle each cell as an individual. I am actually avoiding building a battery pack, that would be a problem. I am working…
Mr.Thinkage
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1
vote
2 answers

Are loose 18650 batteries safe?

Are loose 18650 batteries safe? In some countries they are about the most common type of battery on the market.
Dan Jacobson
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1
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1 answer

What is the name of this connector and where can I find it?

Any ideas on where I can locate this connector? It is from a bike light and connected directly to 18650 battery. 3mm x 2mm with 4 holes, but 2 wires from the battery. On the motherboard the connector is surface mounted (not accessible for photo),…
dmas72
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1
vote
0 answers

BMS shows wrong voltage, changes to 0 V under load

I made a 24 V, 4400 mAh lithium-ion battery using 18650 cells connected in a 7S 2P configuration. When I check the pack output voltage without the BMS it's around 21 V (very low, undercharged). When I check the BMS output it's around 17 V which…
Akshat Sharma
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1
vote
1 answer

TC4056A shuts off at maximum volume (Bluetooth speaker)

I am trying to build a DIY Bluetooth speaker using a 18650 battery cell, a TC4056A battery charger board, an XY-016 that raises the voltage to 6.5 V, a 2200 μF capacitor, and a CSR8645 board. I am using two speakers rated at 5W, 4 Ω. The components…
Andrei-Eduard Lică
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1
vote
1 answer

Powering rechargeable bike lights from 'power bank' while they're lit

Summary: what are the risks / is it advisable to run rechargeable bike lights at the same time as they're charging from an external power source? There are plenty of bright rechargeable bike lights these days. They're great, but in my experience…
Robyn Hines
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0
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0 answers

How to connect batteries of different capacity in parallel

I have a power bank that takes 8 18650 li-ion cells in parallel. I have 6 cells that i salvaged from an old laptop battery that each have @ 2400mAh remaining. Looking at the specs the max charge current is 2600mA and max discharge current is 5200mA…
Johnny24
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0
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1 answer

When I test a 18650 Li-ion cell, why do I get two different values of capacity for charging and discharging?

I'm trying to test the capacity of 18650 cells. I don't know which numbers are important. I get different results on the same cells from discharge and the charge. For example on same 18650 cell: (Panasonic NCR18650BD 3180mAh - 10A) 100% discharge…
Joe Hill
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1 answer

Reverse voltage protection for four 18650 cells

I would like to protect my robot from reverse voltage which is powered by four 18650 cells. Is option 1 sufficient or do I need at least three diodes? I know that using diodes comes with a voltage drop of ~0.6V per diode, but as I use step down…
Michael Brown
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1 answer

Can I "Stack" 2-Cell Li-ion Battery Balancers for a 4-Cell battery?

I'm building a project where I need an internal rechargeable battery. I've decided to go with 4x 18650 Li-ion cells, so I can change them if necessary, the 4x 18650'ies will be used in series, for a higher voltage range. As the cells are in series,…
WeirdWolf
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0 answers

Connect load directly to battery pack and to a CN3722 board

So first of all, there is this question in this same site, but I think it has not been totally answered. Connecting CN3722 to Load AND Battery My question is the same, can I connect a load to a battery which is connected to a CN3722 charger…
jjcasmar
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0 answers

High capacity 3.7 V

I want to combine 10 18650 3000 mAh cells together in parallel keeping my 3.7 V just increasing my original 15 Ah capacity solar light/charger. The original 15 Ah battery had a tiny 1s BMS that for some reason won't charge the 30 Ah pack at all,…
Les Daniell
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