Lower charge current when charging is near complete

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cj0
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Joined: Sun Apr 24, 2016 7:32 am

Lower charge current when charging is near complete

Post by cj0 » Sun Apr 24, 2016 7:54 am

The Opus BT-C700 lowers the charging current when charging is almost complete.

Somewhere between 1,45 and 1,50 volt the Opus BT-C700 decides to drop 700 mA charging current to approximately 50% (350 mA) of charge current.

At the lower charging rate of 200 mA the charge current drops to an effective current of 100 or 50 mA (for example using PWM: 25% on 75% off time) when reaching 1,45 volt.
Last edited by cj0 on Mon Apr 25, 2016 9:52 pm, edited 1 time in total.

Mark
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Re: Lower charge current when charging is near complete

Post by Mark » Mon Apr 25, 2016 12:28 am

What do you see as the advantage of doing this?

cj0
Posts: 9
Joined: Sun Apr 24, 2016 7:32 am

Re: Lower charge current when charging is near complete

Post by cj0 » Mon Apr 25, 2016 8:10 pm

Less heat development, lower battery temperatures. Temperatures above 25ºC reduce the life of the battery considerable.

Mark
Site Admin
Posts: 418
Joined: Sun Jul 28, 2013 6:47 am
Location: Brisbane, Australia

Re: Lower charge current when charging is near complete

Post by Mark » Mon Apr 25, 2016 10:39 pm

If you take a look at the sample charging graph on the main web page:
http://ultrasmartcharger.com/

You will see that with the termination method that we're using on this charger, there is only a small temperature rise of only a bit over 1 degree Celsius right at the end, so I don't see any major benefit in doing this - sorry!

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