budman10

My Feedback: (2)

have two thunder power 7.4 5000 i can only get no more than 4000 and my run times geting shorter and shorter i charge them at 5 amps thay do have a lot of runs

CadillacDTS2001

when your packs look like this.

thanks Doby

budman10

My Feedback: (2)

like what !!!!!

ryan_t888

When they don't discharge at the same rate anymore. They lose capacity slowly, the big hurt is building IR over time.

Ryan

budman10

My Feedback: (2)

so my run times going from 8 min to 4 is bad and batterys temps 150 is bad time for new packs?

ryan_t888

How new is new?

A temperature of 150 would indicate you are drawing too many amps regardless of the condition of the pack. Too much heat in the packs will greatly reduce overall life.

Ryan

budman10

My Feedback: (2)

there in a 29 v hull from fuller fast with a 80 amp baracuda and a 8xl the controler only gets 100 and the same with the motor wide open for 3 min prop is x445 2 blade need more run time

ryan_t888

Your boat could be drawing 2A in total, if the packs are over heating you are drawing too many amps.

Replace the packs with 2 new 4s ones and run them in parallel. You will get a much better run time and discharge rate. (Double)

Ryan

detox

If your packs appear to be swollen or puffed out they are starting to go bad. Be sure your LVC is working properly or bring boat in before it starts slowing down to prevent cell damage. And like ryan t888 said try to run two packs parallel for more mah. I had four new Venom packs puff because I did not know what I was doing. If you do run Two batteries in series make sure they have a higher discharge rating of atleast 25c or 30c. Extra mah helps also.

Two 2s 5000mah packs in series equals 14.8 volts 5000mah

Two 4s 5000mah packs parallel equals 14.8 volts 10000 mah...this higher mah is safer for a high power hungry setup.

budman10

My Feedback: (2)

thanks guys makes cents packs were geting puffy what packs do u guys think

detox

Flightpower has a 90 day warranty on their packs.

Be smart and make sure you have enough battery for the job. If pack temps start fealing warm such as 120 degrees...they are being over worked.

ryan_t888

Wow, I aim for temps of 120-130F. They need to be warm to perform.

Ryan

CadillacDTS2001

woah. wha???
the IR in the cells drop at 100 Deg+ thus "unloading" your packs and making you go faster and making your batteries live longer and happier. at 120 -130 Deg, your packs have such low IR they could " live forever"

I aim like Ryan said for HOT cells. 100-130 is normal for me. any thing colder and you risk damaging your cells.

on race day in colder conditions i will keep my lipo packs in a hot box at about 90 deg or in a heating blanket or in the sun in the window of my car to get hot. this way they preform better and they can discharge better. thus. a happier cell

budman10

My Feedback: (2)

ok then the packs are 1 year old and 40-50 charges what do you guys think i just need moore run time the packs are run in series 2. 2 cell 7.4 5000 thunder power i no i have to give it time to cool off offter 4 min but i cant even get that out of it any one whant to buy a boat its fast FOR ABOUT 3 MIN [&o]

ryan_t888

Run your hull on 4s2p. Longer run time and less heat in the packs.

Ryan

budman10

My Feedback: (2)

sorry got a ques i have 4 packs 7.4 5000 can i make that work with out spending 450.00 on new packs how can i wire that i have room in the boat help!

ryan_t888

Run 2 packs in Series, and 2 Packs in parallel. You will have 14.8v @ 10 000mAh. -4s2p

Ryan

detox

Thanks guys for correcting me on this. I read some bad info in another forum.