18650 batteries
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#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
#12 (permalink)      11/28/2021 5:42:01 AM US Central   quote/reply + tips
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pewpew
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dupe

Edited on 11/28/2021 at 5:43 AM. Reason:
The answer to 1984 is 1973 § Panasonic or Samsung - that is the question: Whether 'tis nobler in the mind to suffer.
#13 (permalink)      11/28/2021 5:42:06 AM US Central   quote/reply + tips
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pewpew
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Any 18650s not in use to be stored either in fridge @ 5°C or, more practically, in powerbanks.
You can grab cheap Chinese "DIY" powerbanks which are essentially powerbanks with removable cells, sold'n'shipped w/o cells and otherwise assembly hassle free and ready to use.
The answer to 1984 is 1973 § Panasonic or Samsung - that is the question: Whether 'tis nobler in the mind to suffer.
#14 (permalink)      11/28/2021 12:06:22 PM US Central   quote/reply + tips
Crispycritters
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pewpew wrote:

Any 18650s not in use to be stored either in fridge @ 5°C or, more practically, in powerbanks.
You can grab cheap Chinese "DIY" powerbanks which are essentially powerbanks with removable cells, sold'n'shipped w/o cells and otherwise assembly hassle free and ready to use.



Storing 18650s in the fridge isn't a great idea. It was fine for older NiCad batteries because allowing them to discharge completely didn't harm them (and occasional complete discharge to zero helped avoid memory lock) but lithium ion cells can be permanently damaged if they are allowed to drop below 2.5 Volts.

All batteries will self discharge faster in cold weather, sticking li-ion batteries in your fridge is asking for trouble. Batteries discharge faster in cold weather and storing them in the fridge is risking them falling to below 2.5V before you have noticed.

#15 (permalink)      11/28/2021 4:48:27 PM US Central   quote/reply + tips
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Troepfler
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pewpew wrote:


You can grab cheap Chinese "DIY" powerbanks which are essentially powerbanks with removable cells, sold'n'shipped w/o cells and otherwise assembly hassle free and ready to use.


How long you test it, dangerous situations ?
I am not an electric specialist, but perhaps it is less dangerous.
It seems, we will not have between a 3.2V and a 4.1V battery a 1A current.