how batteries work?

rydzjunior · #1 01-23-2007, 10:22 PM

ok, i have bought a dodge rammunition that use a 7.2 volts 2000mah. When i plugged in a battery pack with at least 900 mah and same voltage but smaller batteries, the car was barely moving and seconds later the batteries started to heat up and smell. i think they were not capaple to withstand my big motors truck need of electricity. Could it be because my 900mah pattery pack had not enough electricity capacity(mah) compared to my 2000mah battery pack?

#2 01-24-2007, 02:13 AM

I think the problem is that the batteries in your 900mAh pack are not able to supply the amount of current your truck needs. Drawing too much current from batteries would definitely heat them up.

rydzjunior · #3 01-24-2007, 05:00 PM

thats what i thought until i tried energizer ones. i tried 6 to 8 of them (they were d size) to get at least 7.2 volts or more and it did the same thing. the batteries smelled and heated up. energizer batteries have no charge capacity since they cannot be charged, so how did they not draw enough current to my truck? i still think its because my truck needs to much energy. By the way my truck is very cool and fast as a stock gen1 xmod (15km/h). and has lot of power. but the battery lasts only 10 min. approx. this is why i tried to get better and bigger batteries.

Namuna · #4 01-24-2007, 05:41 PM

I imagine when you say "Energizers" you mean the Alkaline ones.

Someone can correct me here, but by its' nature, Alkalines don't have near the discharge rate as NiMH rechargables...So you're back to the original problem (overheating).

Check our your local hobby shop and even RadioShack and some department stores that sell RCs (Walmart, Target, Kmart, etc...) for what they have with 7.2v RC NiMH Battery packs (obviously you'll be looking for anything 2000mah or higher).

Good luck.

rydzjunior · #5 01-24-2007, 07:26 PM

therefore, if i use rechargeable d sized or c sized 3000 mah to produce 7.2 volts, it should work? and if i do the same thing for double A batteries with 2000mah it should work?

rody · #6 01-25-2007, 11:50 AM

I was just reading somewhere about someone who was using a certain mah rating for racing his mini-z. He was saying that the higher rated mah batteries come with a price...lower current delivery, which was why he was using 750 mah as opposed to higher mah rated batteries. Does anyone know if this is actually true? If so, where is the best performance point coupled with decent run times?

I just bought a bunch of 1750 mah aaa rechargeables thinking these are the better batteries, but now I'm wondering if I did the right thing.