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Questions tagged [18650]

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0 votes
2 answers
139 views

Can I charge my 3S2P 18650 battery (12.6v) with a normal 12v power adapter if I use a BMS with built-in balancing+protection? [closed]

First off, I would like to stress the fact that I am no electrical engineer or anything of the sort, just a hobbyist that is into this kind of stuff. So please bear with me, as I know a few things ...
Respoda555's user avatar
9 votes
3 answers
3k views

18650 Cell (8800 mAh) accepts only 300 mAh on recharge

My ESP32 device uses a new 18650 until it is down to 3.3 V. My charger draws current until it is again at 4.2 V. Its indicator shows that 330 mAh has been loaded. This is surprisingly far off the 8800 ...
Dieter Menne's user avatar
0 votes
0 answers
53 views

How to add charging to LED light running on 2s 18650?

I am new at this and was hoping for some guidance. I currently have this setup for testing- 2s 18650 7.4V --> Constant Current Boost Regulator (XY-SJVA-4) --> 20W LED I can't seem to find clear ...
el999999's user avatar
0 votes
0 answers
68 views

Powering Raspberry Pi and motors with same battery

I'm building a Raspberry Pi (2 model B) robot with two l298n H-bridge modules to drive four motors, and am using the charger board module pictured below (lx-lbu2c - 2.4a output) to charge two 18650 ...
Aaron J Spetner's user avatar
0 votes
2 answers
66 views

18650 cell will use ______ amps every _____mins?

I am looking at how to utilise the BQ77915 Ultra-Low Power Primary Protector with Autonomous Cell Balancing by TI, using eight 18650 cells, each with a BQ77915 IC allowing 3 series - 5 series cells. ...
9_daytona's user avatar
0 votes
1 answer
114 views

Reverse polarity protection for parallel connection of 18650 batteries

I want to use two Li-Ion 18650 batteries in the device. The batteries need to be connected in parallel and they can be removed from the device (holder). The device itself is protected from incorrect ...
Erni's user avatar
  • 1
1 vote
1 answer
301 views

How to get a stable 3.3V/2A output out of a single cell (18650 Li-ion) battery?

In my tiny quadcopter, I need to power a long range wifi card which take 3.3V/2A max as input. The quad runs off a single high current 18650 Li-ion battery. Are there any chips or modules that will ...
Dave's user avatar
  • 337
0 votes
1 answer
283 views

Is my 4s2p pack connections correct?

I'm planning to build my 4S2P battery pack using 18650 lithium-ion battery cells. I need to make sure my connections and my battery pack is correct and safe before I make the connections. Here's the ...
Tune333's user avatar
0 votes
0 answers
22 views

How to monitor capacity of 18V Li-Ion battery pack? [duplicate]

I have been learning more about how battery packs work and are made. I have been playing around with this one: https://www.batteryspace.com/li-ion-18650-battery-18v-2900-mah-52wh-7a-rate-5s-s-...
joe's user avatar
  • 183
1 vote
0 answers
109 views

BMS abnormal behavior

I would like to power the lighting system of a small cabin using 3 DeWalt 18 V, 5 Ah battery packs. The system consists of six 10 W bulbs each (12/24 V) and a 20 W, 12 V spotlight. DeWalt battery ...
Marco Volpatti's user avatar
1 vote
0 answers
76 views

Replacing 18650 batteries by another brand batteries (similar specs)

I replaced the battery pack of my robotic lawn mower by a generic one bought on Amazon (quite expensive, but not as expensive as the original brand one that's sold at 110€!). The battery pack consists ...
brunetton's user avatar
  • 111
1 vote
1 answer
51 views

Is a TP5100 module redundant with "protected button top" 18650 cells?

I am going to use a TP5100 module in a device to manage two 18650 cells in a 2S configuration. Are there any advantages or disadvantages to use "protected button top" batteries in this ...
Mark Harrison's user avatar
0 votes
1 answer
88 views

Isolated two battery load/charging system (parallel 18650)

I am working on a project and wanted it to be very robust and user-friendly. To power said device, I had planned on using two 18650 in series (li-ion), like everyone else. The problem I had was that ...
Prototype_Zero's user avatar
5 votes
2 answers
822 views

Charging two 18650 cells connected in series?

It is easy to charge a single cell or cells connected in parallel with a single TP4056 module. This question shows why this can't be done with cells connected in series (short circuit of the cells). ...
Mark Harrison's user avatar
3 votes
1 answer
106 views

Protecting parallel 18650 cells

My son is doing an Eagle project where he is creating a solar charged LED light set up using two 18650 cells in parallel. We are working to ensure they are safely protected. From the research we have ...
Shy Dinosaur Productions's user avatar
0 votes
0 answers
28 views

How to connect batteries of different capacity in parallel [duplicate]

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 ...
Johnny24's user avatar
0 votes
1 answer
70 views

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: (...
Joe Hill's user avatar
0 votes
1 answer
75 views

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 ...
Michael Brown's user avatar
0 votes
1 answer
101 views

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 ...
WeirdWolf's user avatar
0 votes
0 answers
34 views

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 ...
jjcasmar's user avatar
  • 111
0 votes
0 answers
45 views

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 ...
Les Daniell's user avatar
0 votes
1 answer
34 views

Can I draw power from one cell while charging 5 in series?

I recently watched this video by DIY Perks and I want to build some bluetooth speakers using the electronics from a pair of Bluetooth earbuds and a class AB amp for some 10w speakers. Very similar to ...
Adam Hey's user avatar
  • 103
1 vote
3 answers
83 views

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 ...
Oleg Red's user avatar
0 votes
3 answers
103 views

18650 parallel power bank cooks the furthest batteries

Against my better judgement I bought one of these 18650 power banks (see image). The reviews didn't disclose any issues and this sort of tech is so common now I never really thought much of it. It ...
Ben's user avatar
  • 1
2 votes
4 answers
1k views

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 ...
Titor Ps360's user avatar
1 vote
0 answers
47 views

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 ...
Mr.Thinkage's user avatar
0 votes
1 answer
173 views

I just built an 18650 battery. I need to know if I can use this power adapter/charger for this BMS [closed]

I just built my first battery. I need to know whether I can use a 12 V, 1.8 A power supply that I fished out of a box of electronics I have. It was for an Apple router or something. The battery is a ...
MarkIII's user avatar
1 vote
2 answers
622 views

Are loose 18650 batteries safe? [closed]

Are loose 18650 batteries safe? In some countries they are about the most common type of battery on the market.
Dan Jacobson's user avatar
0 votes
1 answer
151 views

S8550 reducing current

Updated Schematic I am trying to set up an external battery storage for solar lights as the solar lights are not in direct sunlight and cannot charge their own batteries. Each solar light runs off a ...
NateA's user avatar
  • 1
0 votes
0 answers
37 views

Wiring multiple 5.2 V Li-ion booster modules outputs together to get 3 A output current

I need help figuring out how to wire booster modules in parallel for a high current output. I'm using four 18650 batteries to power a tablet I'm putting together that runs on a Raspberry Pi 4, and ...
Wire Bin's user avatar
0 votes
1 answer
152 views

High-power LED driver

What would be the best way to drive 3 high-power RGB LEDs with one 18650 battery? The LEDs are 3 W a piece. Forward voltage is 3.2 V, forward current 350 mA per color. I would like to use a mini RGB ...
Matthew Whitlow's user avatar
0 votes
1 answer
156 views

How can I use two 18650 cells with a 5 V, 4 A load?

I was planning to use two 18650 protected batteries (each comes with its own internal protection circuit against overcurrent, overcharge and undercharge) to power a load of 5 V, 4 A. Their maximum ...
Stremon's user avatar
2 votes
1 answer
3k views

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's user avatar
1 vote
1 answer
146 views

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 ...
dmas72's user avatar
  • 11
1 vote
0 answers
234 views

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 ...
Akshat Sharma's user avatar
0 votes
1 answer
406 views

Can I mix three 18650s with different brands?

I have three 18650 batteries with different brands, but the same voltage and capacity. Can I mix them using a 3s BMS with balancer without a risk?
user330586's user avatar
0 votes
2 answers
79 views

Portable car audio system [closed]

Before getting hurt we want to ask trained people, just to make sure our assumptions are true. We have a pioneer MVH-S320BT car radio, 1 subwoofer, 2 tweeters, and 2 woofers, so our idea is to link ...
minghierid's user avatar
1 vote
1 answer
93 views

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 ...
Andrei-Eduard Lică's user avatar
1 vote
1 answer
590 views

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

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 ...
Robyn Hines's user avatar
0 votes
1 answer
729 views

Typical thermistor spec for li-ion pack?

I'm trying to save an inherited Stiga lawnmower with a battery pack that I thought was dead. It's a 20 cell 18650 pack at 36V. When newly charged, the running time is just a few minutes before the ...
Viktor Hedefalk's user avatar