Lipo battery capacity question

[tonystr]

If a 3s cell pack is rated for say 1000mAh is that the total or is that 1000 per cell making 3000mAh. Thanks

is this any good?

Turnigy nano-tech A-SPEC G2 1300mah 3S 60~90C Lipo Pack

By my thinking the above lipo would contain only half as much more energy than an 18650.

Yeah i think this is a stupid question, but maybe someone can enlighten me.

 

[doobedoobedo]

The mAh rating is mAh per cell so a 1000mAh 3S is 3 1000mAh cells in series.

I use quite a few of the Turnigy nano-tech cells/packs (not the A-SPEC ones) and have found them to be excellent.

 

[tonystr]

The mAh rating is mAh per cell so a 1000mAh 3S is 3 1000mAh cells in series.

Right that's more like it. Otherwise there dont seem any point to using a lipo pack. Thnx

 

[TruckinVaper]

When looking at multi cell lipo packs it helps to work out the Wh of them to make comparisons. Yes a 3S 1000mAh lipo pack holds the same amount of power as three single 1000mAh cells but that doesn't make them 3000mAh, they are still 1000mAh. The three cells would need to be linked up in parallel to make them 3000mAh.

The pack you linked to for an example. Watts equals Amps times Volts so

1300mAh times nominal voltage of 11.1V gives you 14430mWh divide the mWh by 1000 to give you Wh leaves you with 14.43Wh

Compare to say a Samsung 25R, 2100mAh times nominal voltage of 3.7V gives you 7770mWh or 7.77Wh

 

[doobedoobedo]

When looking at multi cell lipo packs it helps to work out the Wh of them to make comparisons. Yes a 3S 1000mAh lipo pack holds the same amount of power as three single 1000mAh cells but that doesn't make them 3000mAh, they are still 1000mAh. The three cells would need to be linked up in parallel to make them 3000mAh.

The pack you linked to for an example. Watts equals Amps times Volts so

1300mAh times nominal voltage of 11.1V gives you 14430mWh divide the mWh by 1000 to give you Wh leaves you with 14.43Wh

Compare to say a Samsung 25R, 2100mAh times nominal voltage of 3.7V gives you 7770mWh or 7.77Wh

Exactly.

Also if you believe the specs, theoretically that little battery can output 980W when fully charged.

 

[Tubbyengineer]

Also a point to note when using Lipo packs on mods is the C rating, Lipo pack ratings are higher than 18650 due to the physical construction of the cell. This higher C rating also has an effect on battery runtime as when using High C packs at lower C ratings then you get increased runtime because of the reduced strain on the pack. If you have a 60 C pack of 1000mAh then you can draw 60Amps continuously, obviously at that rate the life isn't going to be very long but you get the rated mAh from the pack. if you only ever use the pack at 15Amps then over the course of a full charge you will actually get slightly more Mah than the pack is rated for...

 

[TruckinVaper]

Exactly.

Also if you believe the specs, theoretically that little battery can output 980W when fully charged.

If you believe the specs yes, I don't believe there are currently any true 60C packs, it'd still be a good pack though if it makes a true 25C, about the best there is in my opinion. I never trust C ratings on lipo's, too many manufacturers stick a big number on there to try and make it look like it's better than the competition when in fact it isn't. The only real way to know is to measure the internal resistance accurately and use that to decide for yourself how much power you're willing to burn internally without damaging the cells more than an acceptable level. For that pack to be a true 60C it's measured internal resistance would have to be around 1.4 milliohm, I reckon you'd be lucky if it's around 8 milliohm.

Tubby is right when it comes to running a lipo at well below its max, that would certainly give you more useable power from it. The only time I don't always go by that rule is when using a lighter pack has more benefit than the extra duration but then I'm usually using lipos in model aeroplanes, only just started playing with them in mods.

 

[TruckinVaper]

Also a point to note when using Lipo packs on mods is the C rating, Lipo pack ratings are higher than 18650 due to the physical construction of the cell. This higher C rating also has an effect on battery runtime as when using High C packs at lower C ratings then you get increased runtime because of the reduced strain on the pack. If you have a 60 C pack of 1000mAh then you can draw 60Amps continuously, obviously at that rate the life isn't going to be very long but you get the rated mAh from the pack. if you only ever use the pack at 15Amps then over the course of a full charge you will actually get slightly more Mah than the pack is rated for...

All very true Tubby but as I say, if the specs can be believed, still the better the pack the more useable power you can get from it.

If your theoretical 1000mAh 60C pack was what it says it is and you ran it at 60A, in theory you would get 1 minutes worth of vaping out of it, say 12 5 second pulls. Might want to carry a spare or two

p.s. always odd talking to you and calling you Tubby, never something you'd do in real life. Maybe we should be more respectful and call you Mr Engineer

 

[Tubbyengineer]

All very true Tubby but as I say, if the specs can be believed, still the better the pack the more useable power you can get from it.

If your theoretical 1000mAh 60C pack was what it says it is and you ran it at 60A, in theory you would get 1 minutes worth of vaping out of it, say 12 5 second pulls. Might want to carry a spare or two

p.s. always odd talking to you and calling you Tubby, never something you'd do in real life. Maybe we should be more respectful and call you Mr Engineer

Doesn't bother me, as long as I'm not being called "The Accused", "Oi you", "Grab the bastard" or "That shifty looking one over there officer!" then it's fine by me, Tubby has served me well at Vapefest, several vape meets and online for two years now, Plus it has the advantage of no bugger else wanting the Moniker...

 

[Raguri]

If you believe the specs yes, I don't believe there are currently any true 60C packs, it'd still be a good pack though if it makes a true 25C, about the best there is in my opinion. I never trust C ratings on lipo's, too many manufacturers stick a big number on there to try and make it look like it's better than the competition when in fact it isn't. The only real way to know is to measure the internal resistance accurately and use that to decide for yourself how much power you're willing to burn internally without damaging the cells more than an acceptable level. For that pack to be a true 60C it's measured internal resistance would have to be around 1.4 milliohm, I reckon you'd be lucky if it's around 8 milliohm.

Tubby is right when it comes to running a lipo at well below its max, that would certainly give you more useable power from it. The only time I don't always go by that rule is when using a lighter pack has more benefit than the extra duration but then I'm usually using lipos in model aeroplanes, only just started playing with them in mods.

Turnigy are known for being shit hot with their classifications... Why? As they have to be since they're mainly designed as racing cells.
Hence why I love my Hard Case packs.