RC Tank Warfare community hobby forum

The thing about Nimh batteries is that they prefer a high amp charge to a low one, so 4 amps is better, and faster than a 1 or 2 amp one.

The other thing is that they drop the voltage quite a bit during the first 24 hours. The best way to use them is straight off the charger and hot. A lot of people charge an Nimh battery maybe the day before they use it, or leave it in a model and use it may be once a week. This will reduce the constant voltage available, and it will appear that the battery is under performing. Changing to Lipo's will appear to offer more power, but some of the difference is down to the way that the two battery types function.

Regarding Nimh batteries, the cells are tested during production. The top performing cells go into the premium batteries that the racing guys use and that cost at the top end of the market. The lower performing cells go into the run of the mill batteries.

6800mah batteries aren't the whole story, what is important is the length of the linear power delivery. Good batteries are designed to drop the voltage when first used after a charge, but then deliver a constant voltage for a fixed duration. It is the length of that fixed duration that determines the quality of the battery. Tank systems have low voltage detection, and that means that if your battery quickly drops to the cut off point...the tank stops.

If you take your tanks away for weekends etc battling, there is the re-charge to consider, and how long it takes. To fully charge a 6800mah battery, even on 4 amps, is likely to take the best part of an hour. A 3-4000mah battery won't last as long, but the charge time may only be 20 minutes.

I used to think batteries were just batteries until I started reading up on them...

RobG

PS - Tamiya do not make batteries, if the seller is mis-describing his product that way to sell it, I would also doubt the other information provided?

Thanks guys, may just stick with the mato 3300 that Dave / Forgebear sells. At least I can trust his reputation and will get a great service from him.

Merlin707 wrote:Thanks guys, may just stick with the mato 3300 that Dave / Forgebear sells. At least I can trust his reputation and will get a great service from him.

Sounds like a Plan Merlin .....just remember to do the initial charge with your stock drip charger...then your aftermarket after...initial charge for a 7.2 is anywhere from 4 to 6 hrs

ALPHA

heads up fellas, I purchased lots of batteries from this ebay guy and sold quite a few.
Failure rate is around 33%, so I mean buy 3 batteries and one of them is junk.
The 6800 are no where near 6800 and actually would equate more to a 3300 mah battery.
These batteries are single cell, each battery having 2 cells. What that means is digital or smart chargers will always read the wrong voltages or amps when charging.
I had a devil of a time with these batteries and curse the day I bought my first bunch.

FreakyDude wrote:heads up fellas, I purchased lots of batteries from this ebay guy and sold quite a few.
Failure rate is around 33%, so I mean buy 3 batteries and one of them is junk.
The 6800 are no where near 6800 and actually would equate more to a 3300 mah battery.
These batteries are single cell, each battery having 2 cells. What that means is digital or smart chargers will always read the wrong voltages or amps when charging.
I had a devil of a time with these batteries and curse the day I bought my first bunch.

SINGLE CELL?????????????????............that's pretty bogus
sounds very similar to those batteries for Ecig ...those Volcano models


ALPHA

I still can't make head to tail between LiPo and NiMh batteries, too many pros & cons for both.

Would my new Turnigy Accucel 6 charge both, and does anybody know anything about this charger?

Merlin707 wrote:I still can't make head to tail between LiPo and NiMh batteries, too many pros & cons for both.

Would my new Turnigy Accucel 6 charge both, and does anybody know anything about this charger?

LIPOs take specific chargers..and yes it does look like yours can do the job



That charger looks like its a better Lipo charger than Nimh or Nicds


the white ports are for lipo...the four and three pin are the ones you'd probably use most ....between the two the three pin would be for 7.2s and up

ALPHA

I run 5100mah batteries in both my tanks run time is about 1.5 to 2 hours depending on the terrain I'm running them on, more hills kills them quicker. I charge them at 4 amps and takes about 15-20 minutes to charge them. I'm happy with the way they work.