That is not entirely true.

To get the fastest charge on these cells the better circuits use IR compensation circuitry to optimize charge time. On a 4.2V cell you can peak a bit higher if you compensate for internal cell resistance. The "cell" still only sees 4.2V while the cell's internal resistance might be dropping 0.3V or more.

Dan

 

re-reading it. Okay..so why does the battery not actually say 16.8v?

is it something like that it takes 16.8v to charge but outputs 14.8v only?


Thank you for your patience..I literally am starting from ground zero here.

I'm kinda curious about the c rating of this charger. to google i go!

 

Because the ad is made by salesmen who are not engineers.
A lithium battery cell is 3.2V when dead and is 4.2V when fully charged. So its average voltage is 3.7V. 4 cells x 3.7V= 14.8V.

Almost.
Its voltage slowly drops as it discharges. It will be 4 cells x 3.2V= 12.8V when it is dead and its protection circuit should disconnect its load.

My electric model airplane shuts off the motor when the battery cells drop to 3.3V each. Then the receiver and servos still have enough power for me to safely land the plane.

If a lithium cell is less than 3V then it is ruined and it might catch on fire if it is charged. The charger should sense a voltage that is too low and reduce the charging current.

Go to www.batteryuniversity.com .

__________________
Uncle $crooge

 

Thanks for the link. I'm going to read it all now. Soak it up like a sponge (I hope)

 

Hi
I need a help to design a battery charger from solar panel , I have a 6V 2.2W solar panel which I am connecting to a 3.6V NIMH 2500mAh battery, I want to use a MOSFET as switch so I will be monitoring the bat voltage , when rich 4.5V the MOSFET will be turned OFF , the reason also that I am using the MOSFET is to not have too much losses and also for power of thr battery not to come back to the solar once the MOSFET is OFF and solar voltage is lower than the Battery.

 

I use one of these to monitor li-po battery voltage...

DealExtreme: $3.43 Digital Multi-cell Lithium Battery Voltage LCD Display for R/C Models