cholonya

Hi guys,
i'm sort of a newbie here and have a question 4 u

i have a 6-cell 7.2V-1800mAh battery and the following two chargers:

9.6V-700mA
9V-300mA

which one should i use to charge my battery pack?? what would be the charging time for each??

thanks

guver

My Feedback: (325)

6720 for the faster one. ignore
2700 for the lower one. ignore



Top one delivers 1800 in 2.5 hrs.
Bottom one takes 6 hrs to deliver 1800

I'd use the faster one while checking temps toward the end because the figures can be off quite a bit.
The current is the info needed to calculate chargeing times (it is per hr)

cholonya

so i can safely use the faster one right?? maybe i can use a timer switch electrical plug and set time to 2.5 hours. thanks

what are these numbers?? :S i didn't get it :s

cholonya

edit

ok ok i get it know

of course i know it is not the way i should calculate but anyway, thanks

guver

My Feedback: (325)

Yep, that would be a great safey stop to put it on a 2.5 hr timer. The faster one would be fine.

cholonya

but is it OK to charge a 7.2v battery w/ a 9.6V charger??

richrd

You must remember any time you use something designed for one thing and use for something else you are now reasonable for it’s outcome. When you plug in the high 9.6 V into 7.2 battery the rating are no longer valid. May put out more current than rated may over heat charger or NOT! You must monitor it the first few times to make sure. If you have a current meter use it to see, if not then know how much your ran the battery down and time it as it charges around 1.55 volts per cell it’s getting done an should start to warm up, now it’s time to stop.
Rich

cholonya

but the charger came with the battery set is already 9V. should that be exactly 7.2V???

guver

My Feedback: (325)

Lots of times the sticker will list the battery voltage , yet the embossed info on the plastic case will list a current and output voltage. The output voltage is always higher than the battery nominal voltage that it's designed for. The voltage is always a lot higher than that when not chargeing. If the voltage wass 7.2 on the device then the battery would power the device (backwards).

cholonya

as a result, i can safely use 9.6V 900mAh charger right??

guver

My Feedback: (325)

Yes, that should also work and be even faster too.

cholonya

ok, thanks

cholonya

today i bought a 6-cell peak charger. it charges w/ 900mA until delta peak and stops the charge then it pulses the battery w/ 100mA every hour to maintain the full charge now i don have to bother with the charging time or overcharge issues

guver

My Feedback: (325)

That's a lot better deal.