Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
moe in wichita ks next week iam getting a rc nitro car. i bought 8 nimh aa bats, rated at 2000 mah, die hard brand, also bought same brand charger. seams to workfine. but should i discharge down to or near 0.0 volts before recharging? if so whats the best way to discharge it?
Old fashioned Ni-Cad cells had a "memory" that is erased by a complete discharge. If the cells are still in series when they are deeply discharged then some are destroyed.
Each cell needed to be discharged separately.
Ni-MH cells do not have a "memory" so they do not need to be completely discharged.
You need to use a smart charger so that your battery is fully charged but not over-charged. A cheap charger only has a timer and if your battery is not low then it will be over-charged.
You should search for an R/C forum (plenty out there, into R/C Helicopters myself). Easy way to sort out the good, bad, and affordable. If the batteries and charger came from the same place as the car, should probably work well, since most hobby place make their money off repair parts and upgrades. The longer you run the R/C, more likely you are going to need some parts, plus you'll get hooked, and go for something bigger, faster...
moe in wichita ks well Sceadwian when i read your post i thought i may have put down the wrong number, so i checked the cardboard that came with the aas, i keep everything. the way it is writen its saying that 4 aas are 2000 mah. one needs to read it carfuly. yea 2000 in one aa would be great. so what i have is 500 each aa. but i cant remember how many aas gos in the car. when i get the car, thursday ill post how many aas it takes. i realy love this site. also i did a lot of reading on the net. it sounds like it realy doesnt mater if you totaly discharge a nimh bat. thanks everyone
The latest Energizer AA size Ni-MH cells are 2450mAh each.
Duracell does not post spec's for their Ni-MH cells on their website.
My cheap Chinese solar garden lights have toxic old 500mAh Ni-Cad cells.
You must not totally discharge Ni-MH cells that are in series. Then the weakest one goes dead first and the other cells charge it in reverse while they continue to discharge. Stop discharging Ni-MH cells that are in series when the voltage of each cell drops to 0.8V to 1.0V.