Power Supply Amperage Question

Luxbright

Enlightened
Joined
Jul 18, 2004
Messages
371
Location
Singapore
I am wondering if a 24 Amp absolute Power Supply used on the Triton Charger
charging (parallel) 2 x 2400 mAh Li-ion battery would charge it faster than one that is 16 Amp.

Thanks
Terry
 
Hello Terry,

The power supply is supplying the Triton with power. The charge rate is selected with the Triton. The two power supplies you listed would not effect the charge rate on the Triton, so the charge time would be the same with both power supplies.

The fastest charge rate (fast as in taking the least amount of time) for 2 2400 mAh cells in parallel will be around 3 amps. At this rate, the CC portion of the charge will last longer. When you hit the CV portion of the charge, the current drops off and the charge time increases.

A fast charge time for Li-Ion is around 90 minutes. A normal charge time is around 120 minutes. Increasing the charge rate gets you to 80% charged faster, but it lengthens out the time to charge the last 20%.

Tom
 
Hi Tom, good to hear from you. :) So, I guess the same principle would also apply for charging NiMH and NiCd.

Thanks,
Terry
 
Hello Terry,

No.

NiMh is a different chemistry and is charged using a different algorithm. It uses a constant current method and lets the voltage go to wherever it ends up. NiMh chemistry does note rapidly vent with flames when the voltage gets a little high.

With NiMh charging, the higher current charge rates will charge the cells faster, but also cause the cells to heat up. Heat destroys the cells, so, once again, there are trade offs.

You can charge NiMh and NiCd cells in as little as 15 minutes. With Li-Ion cells, the best you can do is get them to around 80% in 15 minutes.

Tom
 
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