I posted here because i knew it would get more attention..............speed electric boat forum is like a morgue.[:'(]

Tipped my boat sideways, to let the small bit of water that always gets in the hull trickle out........tipped it too far and one of the 2s 5000 lipos came loose and fell out into 3 feet of water[:@]. I was in my trusty 12' aluminum and scrambled over the side head first into the water..............arms touched the bottom, face and chest in the water, body in the boat. Got it out after about 10 seconds in there and held it where the wires were down to let any water drain out. I lightly squeezed the pack sliding my fingers downward to "squeegee" any water out that i could. Not much really came out at all. Now its drying in the garage under a weighted metal bucket, tested at 7.39v. I really think it will be ok..................any thoughts???

i guess after it dries go ahead at your own risk tho, i dont know much about lipos and water but you could see if it works after it dries but only at your own risk.

My personal guess is that it will be fine, was it salt water or fresh? Salt would be iffy, fresh should be ok.

Fresh................the local small lake....................My Boat Bashing Domain.............fisherman hate it.[:@]

let us know what happens. and watch it while it charges lol

Made me laugh, and yes, let us know if a boat goes up in flames, preferably film it!

Your battery should be fine. I put a plane into about 2 ft. of water once and the battery was fine,but it cooked the esc. If your worried you could always check the other battery and ensure that it discharged to near the same level as the one that went overboard.

In fact the other batt was 7.37v...........very close to the same, basically identical. I have since decided to charge it at 4.5a, checking it frequently, and it finished taking 4137 mah (i didnt run til the cutoff kicked in, but close). No puffing or foul odors.........nothing, i think its fine too! I still have to run it but i have confidence!

As long as the cell packages aren't damaged allowing water in, you should be fine. Lithium reacts with water, so if there is a tear in the cell packaging, you shouldn't use it. Otherwise, the water is just in the exterior and once the water is dried out from the PCB and electrical joints, you should be ok.

I dont know alot about LiPo's but if it were me I'd hose it down with WD-40, water isnt your problem when it comes to electricity, its the stuff in the water heavy metals, etc. A good dose of WD-40<WaterDisplacement 40th try> let it dry, wipe off residue and I'd think it should be fine.

i lipo is a sealed battery and the only thing that are outside are the contacts as long as the battery case wasent compromised it should be fine . the only thing that may corrode are the contacts to the exposed wire

yeah, hotroder has it right you can stick a battery in PURE H2O as in a buch of hydrogen and O2 put in a room, you'd water, but it wouldn't be ionic so the electricity woulnd't go anywhere basically its distilled water, but pond water is probally so i'm suprised it didn't short out but yeah i'd look out for corrosion for sure,

the lug

hmmm....well, the resistance of pure water is about 18 MΩ/cm. Deans connectors? I dunno, 1 mm apart as a conservative guess, so with pure water the resistance will be about 1.8E6Ω. Now of course it is silly to assume that the pond is pure water, so lets be very conservative and divide that by 4...so we got 4.5E5Ω for the resistance. with the equation I = V/R where I is current, V is voltage and R is resistance we find that 8V/4.5E5Ω = 1.77E-5A. So about 18 micro amps was being discharged from the battery.
Assuming that the pond water was 4 times more conductive than pure water. If you want to assume more it's an easy format to follow

EDIT: using values from [link=http://lakeaccess.org/russ/conductivity.htm]this website[/link] I found that if you dropped it into the atlantic ocean, the water could support about 170 amps.

Wow..........Yur smart. I'm heading out right now to run the boat and Harrass the fishermen.................maybe give a duck a scare..........................I'll either come back from a nice drive or carry back a charred hull.[:'(]

Just got back from running my boat...............the batts did just fine! I'll be more careful next time but i wont get so worried if it happens again.

Glad to hear it rebuilder!  Rember WD-40 is your friend, just not as a lube LOL. And Brain, you have too much time on your hands, thats all I got to say LOL.

meh, it was a quick and easy calculation....of course the resistance of inonized water isn't linear with the concentration of ions...so I'm still sure the 18 micro amps is a little low, but you have a few orders of magnitude to play with The hardest part was trying to find some resistivity values for ionized water at an acceptable concentration....

Are you the Professor from "Gilligans Island", now living out his life as a hermit in Montana...........................?

nah, just an engineer in college taking an electrical physics class [8D]

I'm an engineering student as well, it's actually what sparked my interest in the hobby again.