battery question

[CraigP]

@ 3.65v you only have around 5% left in the battery, you need a min of 20% to avoid permanent battery damage which will cause heat & puffing.

If your batteries are measuring 3.65V on the beach, then they are probably below 3V when pulling current while running. You are in very dangerous territory, I advise you to listen to Martin....

[Drkrieger]

As I mentioned if using a lipo buzzer to set at 3.8-3.9V at first then after a few runs find out what the average voltage is. Then if it's between 3.8-3.9V then set it at 3.7-3.8V so you can get a bit more run time.. . etc.I don't know about the sensitivity of your LVC on your Raider ESC . . .as Ryan said he sets his at 3.2V. . .my suggestion was for use with a lipo buzzer. I have two of the Raider 150A myself but as with many of my ESCs, I haven't used them yet so I don't know the sensitivity of the LVC on the OSE raider 150A. So if I'm understanding this correctly you have 4 X 2S 7000mah in your MG29? Isn't that making your MG29 super heavy? So you have 2 X 2S 7000mah in parallel to make 2S 14000mah then same with the other two to make another 2S 14000mah then connecting them in series to make 4S 14000mah? Regardless if you have one 2S 50C or two in parallel or in series the C rating is always 50C .. . .if the C rating is 50C then each cell is 50C. I would run two 2S 7000mah in series to make 4S and your boat would be less heavy and run better then placing 4 X 2S 7000mah in the boat. . .that is if I'm understanding it correctly. . .perhaps i'm just easily confused at my old age, so you'll have to excuse me. .LOL

Sorry if i confused you. I have 4 packs, and each pack is actually 4 individual cells internally. those are 2 parallel pairs in series. This makes one 2s pack, 7000mah 50C.I currently run 2 in series to operate at 4S voltage. I was over explaining.

http://www.gensace.de/gens-ace-7000mah-7-4v-50c-2s2p-hardcase-lipo-battery-10.html

FYI, if you parallel a pack, you effectively double your AMP capability, and your capacity. Series only doubles the voltage

[boatsrnew2me]

did everyone miss this bit of info???

these are Race hard packs

i would say thats your problem right there . hard case packs are not for boats .boats are very demanding and heat up your lipos quite a bit ,hard cases hold in that extra heat ,not allowing it to escape into the air like a soft pack would .

gens are good lipos i use them ,but not hard case packs . i cant tell you how many threads i have read where hard case lipos are swelling when used in boats .

you say they come in at 155.160 but thats on the outside of the case ,you can bet they are 15-20 degrees hotter inside at the cells .

[CraigP]

I'm running hard packs, but only pull 90-110 amps. I did some research before I purchased and I found that what Boats is saying is true... it's the amps that 3-5s batt systems pull in marine applications. I'm at higher voltage, so my current is much lower and doesn't present a problem. They sell those cooler plates for batts, They look like they were made for the hard cases. Does anybody know if this would relieve enough heat to make it worth installing?

[Fluid]

As others have stated, you are badly over-discharging the packs. 160* is far too high and will cause damage over time. The damage is cumulative, that's why the packs are in bad shape now after several months. Many transmitters have timers today, you should time your runs and not rely on the LVC which is obviously not working for you. The packs are probably toast and could pose a risk of fire. Up to you if you want to risk a fire when charging.


.

[CraigP]

Or a fire while running, watch your rig just burn... My iPhone has a timer, I'm sure Android does too. It's just too easy to run a timer. Simple and effective. With the IR so high on those packs, just turn off the LVC, it just won't work right, you'll be hitting cutoff every time you gun it.. new packs and better management next time. Learning experience, and don't get hard cases unless you have a plan to run no more than 100a averages.

[T.S.Davis]

8 minutes!

That's about 4.5 minutes too long.

[rol243]

yes if you don,t have a tx timer how about buying a small digital timer and double side tape it onto the tx . just select the right amount of running time such as 4 minutes and set the timer to go off at 4 minutes. alot cheaper than a new boat .

[properchopper]

yes if you don,t have a tx timer how about buying a small digital timer and double side tape it onto the tx . just select the right amount of running time such as 4 minutes and set the timer to go off at 4 minutes. alot cheaper than a new boat .

Or get a Porkmaster2000 (works for me)

https://www.youtube.com/watch?v=tvQbEnwjNSU

[R2315]

love the porkmaster 2000... simple yet effective

[iop65]

Those hard case packs have 4mm female connectors to plug the wire in ,so it is rather pointless to install 6.5mm connectors on the same wire.
Like boatsrnew pointed out:do not use hard case packs in a decent boat
And run 4 minutes not 8!

[Mxkid261]

My buddy runs the blue 80c dynamite hardcase's in a v2 geico. He beats the crap out of it for atleast 5-7 minute run's and nothing comes back over 130* F but he's running a 1570kv TP4050. Maybe your strut is set a little to deep? I have video of it running if you want to see. I'd definitely ditch the hardcase with the small 4mm leads. I got rid of my hardcase's after one did this lol although I was over propped a little they still hold in heat

18813414_10158754455330716_8973642016191056_n.jpg

[Drkrieger]

Alright. So I will be timing the run at 4 mins, and check the batteries. Thank you everyone.

As for the batteries themselves, I get the race hard packs 7000mah 2S at $24 each, So i may buy another pair, and de-case them. They have a tiny PCB with soldered on 4mm females that completes the cell circuits. If I just remove that, and run 12 or 10 gauge wire to my connectors will that improve my current?

[Drkrieger]

my buddy runs the blue 80c dynamite hardcase's in a v2 geico. He beats the crap out of it for atleast 5-7 minute run's and nothing comes back over 130* f but he's running a 1570kv tp4050. Maybe your strut is set a little to deep? I have video of it running if you want to see. I'd definitely ditch the hardcase with the small 4mm leads. I got rid of my hardcase's after one did this lol although i was over propped a little they still hold in heat

[ATTACH=CONFIG]153547[/ATTACH]

what cell count is he running?

[CraigP]

Those hard case packs have 4mm female connectors to plug the wire in ,so it is rather pointless to install 6.5mm connectors on the same wire.
Like boatsrnew pointed out:do not use hard case packs in a decent boat
And run 4 minutes not 8!

Agreed. 100A average is about it for that connector. I have peak draws (prop cav recovery) about 135A, data logger shows I'm not sagging too badly on volts during that time. But the peaks only last 0.5-0.8 seconds. I expect the caps are supplying much of that peak, fast draw. That's why we put them on, right?!