d.k.v

Can anyone help we work out the charge time 4 my new batt?

The charger outs out 7.2v at 800mA
and the batt is a brand new 3800mAh Ni-mh batt made by enrichpower

can some one please help (down on knees begging) lol

p.s the charger has no cut off to stop when the batt is fully charged.

sheograth

You'll need a higher output voltage to charge a 7.2v battery - you can't just apply 7.2v to it. I'd invest in a real charger before you damage your batteries.

redfisher1974

3800mah divided by 800mah = 4.75 hrs

set a timer for 4.5 hours and then check temp...charge untill its a little warm.

d.k.v

o well on the front of the charge it also has:9v dc at 200mA

d.k.v

i cant wait that long lol

iv only been charging it 4 an hour and a 40 min ops

redfisher1974

I dont think it will harm them persay....but you wont get the most out of them.

The cheap walwarts that come with some rtr's are 7.2 volt.

redfisher1974

My first charger was only 500mah and took forever...lol

sheograth

The cells need to be charged at a higher voltage than their rating for them to take any significant juice. If you take a drained or semi drained 7.2v battery and apply 7.2v - you won't get much performance no matter how long you leave it on there.

d.k.v

nar i bort this one from my lhs(well 20km away)

its a hobby headquaters one

redfisher1974

Thats funny i have a walwart thats 7.2v 500mah that i used to use on a nimh 1800 pack...took a long time but it worked fine and had good run times for a crappy 1800mah.

sheograth

It's probably called that because it's for 7.2 volt batteries, if you checked it's output with a meter it's likely higher.

d.k.v

ill b back im going to the batt fourm

d.k.v

yer i might get my dad to do it with his new meter ( i blew the last one up ... luckly supplyed by his work)

sheograth

Learn to use one first, otherwise you'll blow this one up too and possibly hurt yourself.

redfisher1974

I checked my old wallwart and it puts out 10.23v on the dvm.......It does say output 7.2...I learned something new today...Neat

redfisher1974

that was no load....

redfisher1974

I should check with my dads clamp on meter to check with battery on charge..

sheograth

Yeah, the open circuit voltage of a cheap power supply doesn't mean much either.

d.k.v

i put it onto a 9v batt to work out its amps and the meter went pooff

it was a expensive one too...

sheograth

You tried to measure the current of a battery in a closed circuit with the meter? Of course the meter blew.

redfisher1974

Did you have it on the fused leads? that might have saved the meter and just took out the fuse..

d.k.v

it was on the fused conections but it was kinda old and wat i didnt no was b4 my dad got it they put a fuse rated at 5 x whats ment to be in it