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Circuit protection?
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#1 (permalink)      9/11/2013 5:52:04 PM US Central   quote/reply + tips
  • JoinedApr 2013
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Circuit protection?
Dear Fasttech,

I got this charger some time ago and haven't had any problems with it. However, while reading over some information about problems people have encountered with ego-style batteries going thermal/exploding when charging it seems that some chargers contain circuit protection (good) while others don't (bad).

I may go ahead and get another charger and open this one up to try and find out, however it would be nice to hear back what kind of protection is given by this charger.

Thank you,
#2 (permalink)      9/11/2013 9:55:39 PM US Central   quote/reply + tips
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+1 details
Been using a charger just like that for 4 years and yes they have over charge protection cut of current at 4.2 volt light will go green..
“Never argue with stupid people, they will drag you down to their level and then beat you with experience.” ? Mark Twain
#3 (permalink)      10/20/2014 4:01:58 PM US Central   quote/reply + tips
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Depend on the battery chemistry.

What is the battery nominal voltage ?
3.2v, 3.6v or 3.7v ?

Most Li-ion battery sold today have a nominal voltage of 3.7v, so require 4.2v.
It is not rare to see the other 2 battery types tho.

What is the capacity of the battery and what is the manufacturer's recommendtion on the charging rate ?

It is important to know as the current need to be limited during the first stage of the charging process.
The charge rate of a typical Li-ion battery is between 0.5 and 1C in Stage 1.
Most manufacturers recommend a charging rate of 0.8C or less for their 18650 batteries, with a 3 hours charging time max.

If this charger is 4.2v/420mA then it is "ok" for batteries with a nominal voltage of 3.7v and of capacity between 420mAh ~ 1260mAh.
Note that it will be a bit rough on a 420mAh battery and possibly reduce its life.