pubmaster861

my exact setup is a 1717 neu, and a mamba monster esc. 45 tooth spur and either a 15 or 16 pinion, i have been looking into batteries for my setup and would just like to know how to choose ones to match. I was leaning more towards a turnigy nano-tech 5.0 4s, they claim a 45c discharge. do i want such a high discharge? other batt i was looking at was a turnigy 5.0 4s 25c . in the castle manual it says a minimum of 25c. id like 20min run times outa this hopefully

Dale Gribble

My Feedback: (4)

Continuous current = C rating * capacity (mAh) /1000 = Amps

So, a 25C battery can supply (25 * 5000)/1000 or 125 amps. I know for a fact that Mamba Monsters can pull 150A (reference source: beatyourtruck.com)



I wouldn't go any less than a 30C discharge. Also, I would go with 2 x 2S packs over 1 x 4S pack. The packs are cheaper and if the pack dies, you won't be out as much cash. It will make you CRY if you damage, lose a cell or puff a $75-$100 4S. Get some of these-

[link=http://www.hobbycity.com/hobbyking/store/uh_viewItem.asp?idProduct=14980]http://www.hobbycity.com/hobbyking/store/uh_viewItem.asp?idProduct=14980[/link]

pubmaster861

good point. as for the hard case lipos how can you tell if their puffed? does the case come off?

SyCo_VeNoM

I perfer these over the 5000mah packs
http://www.hobbycity.com/hobbyking/s...dProduct=14991
200 more mah, almost $2 cheaper, and in the USA

I use them in most my RC's(they were ran around 40-50 cycles each). My truggy which runs a MM NEU 2200kv combo, and a Savage with a 150A ESC 2000kv motor in it has no issues at all with them. They have yet to get over ambiant temperature actually.

Dale Gribble

My Feedback: (4)

Dang! I just bought 4 of the hard case 5000mAh packs! I didn't see the 5200mAh ones that were cheaper. Ah well.

SyCo_VeNoM

ya weird thing is they have been for about a year. I never could figure out why the higher rated ones are cheaper

pubmaster861

just wondering how do you tell if the batteries are puffed on hard case lipos?

redfisher1974

You dont...

SyCo_VeNoM

actually you do. the pack won't lay flat on a flat surface and be slightly rounded, and if its really bad the case will split(saw a pic of one once).

My 2 hardcases are very slightly puffed. It wasn't due to anything from turnigy, it was due to me storing them at full charge for 2-3 months.
Basically I charged them up one day planned to run the next. Ran the RC for 3 minutes before I broke a part voltage was still at 4.2v a cell, ordered a replacement. Part came 2 weeks later, and after I got the part installed it rained every day I had free time and was off of work for the next 2 months, and days it didn't rain the area was so saturated with water I would have destroyed my electronics if I ran. Now I make sure to drop my lipos to 3.6-3.8v a cell after that, and not had any more swell. There still running, and charging fine though.

redfisher1974

It could go unnoticed...

SyCo_VeNoM

true it could. Hell mine I only noticed cause I put them in a battery box and noticed they were a bit higher than normal, took em out to see if anything was under them(my box's generally have 4 screws holding them on thought I didn't tighten one all the way), and laid them on a perfectly flat table and saw the corners were raised off the tabletop.

After running them 10-15 cycles since that happened mine returned to normal size, and lay flat again.

Dale Gribble

My Feedback: (4)

I have a hard case where I could tell a cell puffed. Exactly how SyCo Venom explained it.