Testing Lipos

[Formiga]

Thinking about battery options I tore apart an old dell laptop battery. It is a 3S3P lipo pack and has an advertised 7200mAh capacity. I've got it cycling right now and it looks like it holds about 4500 - 5000 mAh with an unknown C rating. So looking at specs for my CC Sidewinder SV2, to split this into 3, 3s1p packs they would have to be capable of a 60c discharge rate to keep up with the max continuous draw. Probably not gonna get that out of laptop cells, so if I do 1, 3s2p pack they would need need to be capable of a 30c discharge rate.

So to test to see if these cells are capable of this, 6 of these cells in a 3s2p configuration should be able to supply 100A without the voltage dropping below a reasonable LVC for however many seconds. Is there a formula for this around somewhere? I haven't found anything on this yet. I understand that my SCX10 or AX10 will never draw that much without being stalled for some reason. I would like to see if these cells are capable of any application that I use my CC SV2 esc.

[fred0000]

lipos are cheap, buy the correct bettery for your application.

[Formiga]

They are, but I can play if I want to!

[Crawler King69]

I doubt your lap top had a lipo. Too dangerous and everybody likes to sue. I dismantled a bat pack from an old Compaq and it has lith ion bats in a 4cell 2 pack configuration yielding 14.8 volts. Not your typical ion bats and I have to charge them on lipo setting to get them to the proper charge rather than life setting.

[Formiga]

Case said Lithium Polymer, 11.1V 7200mAh. 9 cells, in a 3s3p configuration. Lipo has 3.7v/cell, so I'll take that to mean lipo, although I don't know for sure or care what kind of lithium technology they are - providing they meet my needs. Thanks though! Easy to add electronics to prevent overcharging/discharging. Kind of like our escs and chargers have! And they have plenty of warnings and failsafes.

[benoj]

the lipo doesnt need to be able to put out the continuous amp draw of the sv2 say it is a 5000mah for an scx10 you could easily get away with a 20c. i run a 1300 35c and it has no trouble at all

[Formiga]

Originally Posted by benoj

the lipo doesnt need to be able to put out the continuous amp draw of the sv2 say it is a 5000mah for an scx10 you could easily get away with a 20c. i run a 1300 35c and it has no trouble at all

Thanks, knew that I didn't need to supply that for my scx, wondered more if they would put out enough for whatever I want to use the esc for. Moot point though, a 1 amp draw causes a 3v sag when fully charged. I think my dingo will draw more than that. They are too old or sat discharged for too long. Was interesting, and I'm wondering where else I can get cheap lithium cells from!