18650 batteries
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#1 (permalink)      10/25/2021 4:19:31 AM US Central   quote/reply + tips
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kental61
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18650 batteries
All my mods are all 20700 21700 , so i have a glut of 18650 batteries, apart from torches has anyone found any useful items for home car etc that use 18650 batteries.
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#2 (permalink)      10/25/2021 4:29:17 AM US Central   quote/reply + tips
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analogueman
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Indeed, torches are a good use for excess cells.

I also migrate tired batteries to Build-TABs, a bedside alarm clock, etc.
It's twelve inches long, but don't use it as a rule...
#3 (permalink)      11/20/2021 9:52:17 AM US Central   quote/reply + tips
Chopper009
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I've always been curious why it's so hard to find just the protected button-top adapters (button top with small pcb that's on the bottom)? Does anyone have an alibaba link or a link to a company that produces them?

Edited on 11/22/2021 at 8:01 AM. Reason:
#4 (permalink)      11/21/2021 3:33:55 PM US Central   quote/reply + tips
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Troepfler
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kental61 wrote:

All my mods are all 20700 21700 , so i have a glut of 18650 batteries, apart from torches has anyone found any useful items for home car etc that use 18650 batteries.



Cheapest flashlight I found for 4x 18650 was 30 Euro.

There are power banks with a small flashlight.
This with 8x 18650 and small flashlight is cheaper with 16 Euro:


This heavy thing is not for daily use, but in the car it can help,
and sure there will be cheaper power banks with light.

But the question is, how the device loads 8 batteries with different age to the same level?
Edit: and is it safe?


Mod (Anniepan) edited on 11/23/2021 at 8:43 PM. Reason: Advertisement
#5 (permalink)      11/21/2021 5:16:16 PM US Central   quote/reply + tips
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zarck
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+1 details
You increase the risk by pairing old cells.
Not read anything about how much it will increase.

It's considered bad practice. And knowing even good cells vent occasionally...

I recon it's an easy question for most.
#6 (permalink)      11/21/2021 6:26:13 PM US Central   quote/reply + tips
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Troepfler
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Perhaps loading outside the Power Bank and using inside the Power Bank?
Just for a small flashlight it should work?
And in emergency to have power for the handy?
#7 (permalink)      11/22/2021 8:02:24 AM US Central   quote/reply + tips
Chopper009
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Post deleted by mod (Anniepan) on grounds of: Advertisement
#8 (permalink)      11/22/2021 9:34:48 AM US Central   quote/reply + tips
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Troepfler
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zarck wrote:

You increase the risk by pairing old cells.
Not read anything about how much it will increase.

It's considered bad practice. And knowing even good cells vent occasionally...

I recon it's an easy question for most.



We have battery chargers which can balanced charge old and new batteries together.
Why not discharge them balanced?

Xtar PB2C is a 10 Euro 2 slot battery charger and a powerbank with IN/OUT balancer.
They write:
Another special feature is the built-in balancer, both when charging and discharging in the function as a powerbank, the two batteries are always used equally.

Result lygte: ... but batteries must be able to handle 2A charge current.
The power bank has enough power to maintain output voltage, until the batteries are empty. ...
I will rate this as a good power bank and charger.

Why 2A ?

Would be nice to have the same construction for 4/6/8 batteries.


Mod (Anniepan) edited on 11/23/2021 at 8:43 PM. Reason: Advertisement
#9 (permalink)      11/22/2021 10:06:24 AM US Central   quote/reply + tips
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zarck
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They are individually charged. And even so, LiPos are recommended to be charged in a flame resistant bag. So yeah, most of us are not behaving according to best practice.

They are not individually charged if charged via usb in system, and i would guess that here is were the risk is the greatest.

Sure, fires from charging 18650 are rare. Still a friend burned down his garage while charging his battery pack (power tool) unattended just this last summer.

I would guess the risk from discharging is lower.
#10 (permalink)      11/22/2021 10:10:30 AM US Central   quote/reply + tips
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zarck
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Missed that it was the Powerbank version, it might be charged in circuit, but hard to balance without individual control...

#11 (permalink)      11/23/2021 12:25:55 PM US Central   quote/reply + tips
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Troepfler
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zarck wrote:

Missed that it was the Powerbank version, it might be charged in circuit, but hard to balance without individual control...



The 2 slot 18650 battery charger/power bank Xtar PB2C has an IN/OUT balancer.
They write: Another special feature is the built-in balancer, both when charging and discharging in the function as a powerbank, the two batteries are always used equally.
My understanding: with IN/OUT balancer I can put an old and new battery together into the device.
And it is easy to see: each battery has an individual slot.

It seems it is the same construction with these 4 slot devices (with small flashlight):

Same construction with 6/8 batteries would be nice.
Keep the older batteries full charged and have an emergency flashlight/power source.


Mod (Anniepan) edited on 11/23/2021 at 8:41 PM. Reason: Advertisement