intellegent battery charger?

*o* · Post by ***o*** » Tue May 31, 2005 2:22 am

i have 10 2300mah and i dont want to over/under charge them i have heard that you can easily make chargers that sense the charge and stop it accdordingly but i have had no luck finding a diagram.

here are the batterieshttp://www1.jaycar.com.au/productView.a ... BCATID=583

i have been told to charge them at 750 ma for 5 hours

nos_slived · Post by **nos_slived** » Tue May 31, 2005 5:42 pm

Get one of the chargers found in this Google search.

*o* · Post by ***o*** » Wed Jun 01, 2005 1:20 am

is that the best way to do it?

if i cant find one that senses current i can always use a timer.....annyone know how to make a 5 hour cutoff timer?

Warrior_Rocker · Post by **Warrior_Rocker** » Wed Jun 01, 2005 9:36 am

well, even a 5 hour cut off timer would still leave possibility to overcharge..., often you can find charger circuits in old security alarms and such they output say 14v for a 12v battery, its a trickle charger, which is the best way to charge those buggers w/o damaging their cell memory..., also what im doing for mine is using the gamecube battery, it has a intelligent charger built in, and since its 12v that makes things really simple when interfacing to n64...

*o* · Post by ***o*** » Wed Jun 01, 2005 3:04 pm

well ill just have to keep looking thanks

vb_master · Post by **vb_master** » Wed Jun 01, 2005 6:33 pm

You could use a MAX chip.

*o* · Post by ***o*** » Wed Jun 01, 2005 10:40 pm

whats a max chip?

nos_slived · Post by **nos_slived** » Wed Jun 01, 2005 10:56 pm

The MAX712s are what I gave the google search for. They are made for charging batteries and cut off charge at a certain level.

I'm more than just a poster, I can post useful stuff too.

*o* · Post by ***o*** » Thu Jun 02, 2005 1:04 am

so i follow the diagram and i should work?

i will find one that looks good and post it in a minute

*o* · Post by ***o*** » Thu Jun 02, 2005 1:30 am

lets just say i am really dumb and cant find an appropriate circuit could someone find the right one?

nos_slived · Post by **nos_slived** » Thu Jun 02, 2005 1:53 am

Try to figure this out:
http://www.ortodoxism.ro/datasheets/max ... MAX713.pdf

And this:
http://www.selectronic.fr/includes_sele ... MAX712.pdf

And here is one of the best that I have found:
http://www.qsl.net/eb4eqa/batt_charger/batt_charger.htm

*o* · Post by ***o*** » Thu Jun 02, 2005 2:02 am

where do i buy the chips from (how much do they cost)

nos_slived · Post by **nos_slived** » Thu Jun 02, 2005 2:40 am

http://www.maxim-ic.com/quick_view2.cfm/qv_pk/1666

You have to register, but that is just for orderring and shipping purposes. If you go half-way down the page to "LINKS TO MORE INFORMATION", there is a link to get some free samples.

Those are Ni-MH batteries, so be sure to get the MAX712.
The MAX713 is made for Ni-Cad, and if you get that, you will be wasting time and batteries.

MAX712

Good luck!

nos_slived · Post by **nos_slived** » Sun Jun 05, 2005 11:25 pm

Well, I was going to order samples of the MAX712 and MAX713, but I don't have a company, and if I put in fake info, my parents would be wonderring what I was doing. My mom is weird, so I'm not even going into that. Anyways, the samples come in packages of 2, and I was wonderring if anybody could order the samples for those chips and send one of each to me(in the mail) free of charge. Please?