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Efest Slim K1 Charger

MikeDommy

Bronze Contributor
Member For 4 Years
Hey all,

Efest Slim K1 Charger Online shows that it charges 21700s, but the box and manual do not.... but I ordered it, so now I have it. Anyone know anything about this? Also, the manual says that it charges batteries in a few seconds, but I’ve had a battery on there for much longer and the indicator is still not showing fully charged. Do they actually mean STARTS charging?

Any help with these two questions would be helpful. Thanks!
 

Vape Fan

_evil twin_
Staff member
Senior Moderator
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Platinum Contributor
Press Corps
Member For 5 Years
I don't know what they mean by "a few seconds", but it is a 1A charger so it will take a couple few hrs to charge a drained 18650>21700, which is normal. .5A is usually the slowest we find in batteries we vapers use. 1A would be like medium, and good. Some do 2A.
1A is a happy medium and could be better for battery life than 2A. You may not find where anyone has tried or documented a 21700 fitting in this one.
 

MikeDommy

Bronze Contributor
Member For 4 Years
I don't know what they mean by "a few seconds", but it is a 1A charger so it will take a couple few hrs to charge a drained 18650>21700, which is normal. .5A is usually the slowest we find in batteries we vapers use. 1A would be like medium, and good. Some do 2A.
1A is a happy medium and could be better for battery life than 2A. You may not find where anyone has tried or documented a 21700 fitting in this one.

It does fit, and a slow charge is preferred. It’s a brand new battery, so I’m not sure what charge it came with.
 

Vape Fan

_evil twin_
Staff member
Senior Moderator
VU Donator
Platinum Contributor
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Member For 5 Years
It does fit, and a slow charge is preferred. It’s a brand new battery, so I’m not sure what charge it came with.
For battery life, it's not good to store batteries fully charged. New will be 50%ish.
 

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