Milliamps and voltage help please

**Robin Hewitt** · 29-09-2012

Hmmm

If it wants 7-12V then you can run a 9V battery a lot flatter than a 7.2V battery before it drops below 7V. The poor things do tend to fade before they reach their rated Ah.

I think it's looking for a 9 Volter.

Is it really drawing 400mA?

0.4A at 9V is 3.6W. Sees like a lot, does it run hot?

**Fivetide** · 30-09-2012

Originally Posted by Robin Hewitt

Hmmm

If it wants 7-12V then you can run a 9V battery a lot flatter than a 7.2V battery before it drops below 7V. The poor things do tend to fade before they reach their rated Ah.

I think it's looking for a 9 Volter.

Is it really drawing 400mA?

0.4A at 9V is 3.6W. Sees like a lot, does it run hot?

Actually after looking again , its running at 260mA / 800mW, I think also the voltage may affect the range, as it quotes 800m to 1600m @ 12v/280mA's So I might be better finding a 12v battery if I want the better range. The more powerful ones quote 900mA's/2500mW's

Wireless AV

**Jonathan** · 30-09-2012

I hope the tank battery is NiMh/NiCd not LiPo? If it's the latter then you need to be careful as they require a low voltage cutoff to stop them being damaged from over discharge. If it will tolerate up to 12.6V then a 11.1v (3 cells in series) lithium battery would be ideal since when fully discharged it would still be around 10V. Plenty on HobbyKing RC Plane, Car, Heli, Boat and MultiRotor Hobby Store ... if it's the first time you've seen that site you'll no doubt be up all night buying better batteries and all sorts for the tank!

**martin54** · 30-09-2012

What sort of size is the tank it's going into? Sorry don't know much about radio controlled models except some seem to be quite big. Just thinking that a 12v battery from one of those motorized cycles would probably do a good job. Friend of mine lent me 2 to power a small trolley & I was surprised how powerful they were for such a compact size battery.

**Fivetide** · 30-09-2012

Originally Posted by martin54

What sort of size is the tank it's going into? Sorry don't know much about radio controlled models except some seem to be quite big. Just thinking that a 12v battery from one of those motorized cycles would probably do a good job. Friend of mine lent me 2 to power a small trolley & I was surprised how powerful they were for such a compact size battery.

Maybe if people are interested I should start a new thread I explain what I'm trying to do and get help with trying to it ? May help others in the future.