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Big Battery?

Old 08-15-2008, 06:10 AM
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-TiVa-
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Default Big Battery?

My goodness im kinda new to brushless/lipo but man Ive never seen a battery this big. Thunder Power "eXtreme V2" 10S Li-Polymer Battery 25C (37.0V/3850mAh) Im sure its not a rare item or anything, just the biggest Ive seen. lol [sm=wink_smile.gif]
Old 08-15-2008, 09:42 AM
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Default RE: Big Battery?

have seen some of the big gas hulls they convert to electric running 5s 2p 9000 mah. thats some serious power
Old 08-15-2008, 03:51 PM
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Default RE: Big Battery?

It's more like 10s2p

Ryan
Old 08-15-2008, 09:41 PM
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Default RE: Big Battery?

Or in my old 72" PI cat's case, 12s 4p 32k mah.
Old 08-15-2008, 10:50 PM
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Default RE: Big Battery?


12s 4p 32k mah
Hmm, where did you find 8000 mAh cells? The largest capacity cells in common use are 5000 mAh. 32,000mAh/4P=8000mAh per cell.




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Old 08-15-2008, 11:15 PM
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Default RE: Big Battery?


ORIGINAL: Got RPM


12s 4p 32k mah
Hmm, where did you find 8000 mAh cells? The largest capacity cells in common use are 5000 mAh. 32,000mAh/4P=8000mAh per cell.




.
I dissagree, polyquest has 6000mah, which means if enerland makes em, theres prolly more than one company out there with em.
Old 08-16-2008, 10:15 AM
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Default RE: Big Battery?

Max Amps also offers 6000-12 000mAh cells with 8000 being one of there selections. It's been around for a long while.

Ryan
Old 08-16-2008, 10:56 PM
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Default RE: Big Battery?

I dissagree, polyquest has 6000mah, which means if enerland makes em, theres prolly more than one company out there with em.
Disagree all you want, it makes no difference. Read my post before you go off half-cocked. I stated that 5000 mAh cells are the highest capacity in common use. The PQ 6000 cells are brand-new and almost no one has them. Sigh.....

Old 08-16-2008, 11:03 PM
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Default RE: Big Battery?

Max Amps also offers 6000-12 000mAh cells with 8000 being one of there selections. It's been around for a long while.
Apparently you guys do not understand LiPo terminology. The MaxAmp 12,000 mAh PACKS are 3P, meaning that each cell is only 4000 mAh. I asked where the poster found 8000 mAh cells. No one can answer the question. Should I call shenanigans? Sigh......


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Old 08-17-2008, 04:49 AM
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Default RE: Big Battery?

Over on the Rum Runner Forum most of the guys there are running hpr cats excess of 70 miles an hour, lipos of course running 10s 2p PER MOTOR. That many Mah is pretty common in the big electric area...
Old 08-17-2008, 11:02 AM
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Default RE: Big Battery?

Over on the Rum Runner Forum most of the guys there are running hpr cats excess of 70 miles an hour, lipos of course running 10s 2p PER MOTOR. That many Mah is pretty common in the big electric area...
Sigh. First off, the reality is that very few of the posters at RRR actually own or run the big 10S boats - and very very few of them run the HPR cats because of their extreme hull cost. I compete against the gas boats in sanctioned races with my 10S2P/9000mAh Stryker cat - but if you notice it has a maximum capacity of 2P/9000 mAh and uses 4500 mAh cells. It is not even legal to run more than 12,000 mAh in 10S NAMBA competition. The poster above claimed he had 32,000 mAh in his 4P boat, and I asked him where he found his 8000 mAh cells. All he has to do is answer. Since he has not answered my question, I assume shenanigans on his part.

It is abundantly clear that you guys do not understand LiPo terminology.



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Old 08-17-2008, 01:40 PM
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Default RE: Big Battery?

Here's a 2s 8000mah 25c pack. I run two of these in my Emaxx.

http://www.maxamps.com/Lipo-8000-74-25C-Pack.htm
Old 08-17-2008, 09:43 PM
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Default RE: Big Battery?

J T

Yes we understand LiPo terminology. I am NOT interested in how many cells are P'd with in a pack. I am interested in how many packs are P'd to form an overall capacity. Whether I have a 6000mAh pack worth of 4P (1500mAh/pack) or 1P, it makes NO difference.

BB said 10S4P 32000mAh, perhaps it meant 4 paralleled PACKs. A question that we both knew the answer to before it was asked.

Ryan
Old 08-21-2008, 10:33 PM
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Default RE: Big Battery?


BB said 10S4P 32000mAh, perhaps it meant 4 paralleled PACKs. A question that we both knew the answer to before it was asked.
Perhaps you knew the answer, but I did not - hence the simple question (that has yet to be answered). There are 10,000 mAh cells available, perhaps BB used similar cells in his big model. Even though you are not interested in how many cells are in a pack, many others are. It makes a big diffrerence in competition - something else you are apparently not interested in. More's the pity. [&o]

Yes we understand LiPo terminology.../...Here's a 2s 8000mah 25c pack. I run two of these in my Emaxx.
In spite of Ryan's assertion, the terminology for LiPos is still not well understood here. Packs are not cells.....

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Old 08-21-2008, 11:34 PM
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Default RE: Big Battery?


ORIGINAL: ryan_t888

It's more like 10s2p

Ryan
True that!! I do it with four, count 'em, four 6,000 mAh 5S packs. Two in series to make 10S (37 volts) and then another set in parallel to get 10S/37 volts with 12,000 mAh capacity!! A mere $1,300 in batteries for a few minutes of fast fun!! Then it's onto the chargers, yes, TWO chargers to charge the 4 packs!! Loads of fun.

All of that is in a 44 inch gas mono hull.

Here's what it looks like: [link=http://homepage.mac.com/wmalvey/Models/PhotoAlbum29.html]Snipers[/link]

That is it's gas cousin along side!!
Old 08-22-2008, 08:26 AM
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Default RE: Big Battery?


ORIGINAL: Got RPM
Even though you are not interested in how many cells are in a pack, many others are. It makes a big diffrerence in competition - something else you are apparently not interested in.
I find it strange that you try to assume so much about me when you really have no clue.

Any how, I do race competitevly. I believe you race under NAMBA and IMPBA. Let me share you something from the NAMBA rule book.

1. POWER SPECIFICATIONS
a) The following motor and cell configurations will be considered official for
electric racing in NAMBA:

M-2 A single .05 motor with brushes, any endbell, ferrite magnets.
Power Limits: 1-4 Ni-chemistry cells are permitted.

N-1 Any ROAR-approved stock .05 motor as defined by current ROAR
parameters. Power Limits: Up to 7.5 Volts nominal, any
chemistry. Maximum of 2 packs in parallel. Maximum capacity of
10,000 mAh.

N-2 Any single motor, any endbell, bearings, and magnets. Power
Limits: Up to 7.5 Volts nominal, any chemistry. Maximum of 2
packs in parallel. Maximum capacity of 10,000 mAh.

O Any amount and/or size of motors, any endbell, bearings, and
magnets. Power Limits: 7.6 to 10 Volts nominal, any chemistry.
Maximum of 2 packs in parallel. Maximum capacity of 10,000
mAh.

P Any amount and/or size of motors, any endbell, bearings, and
magnets. Power Limits: 10.1 to 15 Volts nominal, any chemistry.
Maximum of 2 packs in parallel. Maximum capacity of 10,000
mAh.

Section # 28
Page # 6
Section Name:
ELECTRIC
Revised 6/30/08

Q Any amount and/or size of motors, any endbell, bearings, and
magnets. Power Limits: 15.1 to 22.5 Volts nominal, any chemistry.
Maximum of 2 packs in parallel. Maximum capacity of 10,000
mAh.

S Any amount and/or size of motors, any endbell, bearings, and
magnets. Power Limits: 22.6 to 30 Volts nominal, any chemistry.
No limit on paralleling of packs. Maximum capacity of 12,000
mAh.

T Any amount and/or size of motors, any endbell, bearings, and
magnets. Power Limits: 30.1 to 40 Volts nominal, any chemistry.
No limit on paralleling of packs. Maximum capacity of 12,000
mAh.
Notice how I'm not interested in how many cells are paralleled with in a pack and neither is NAMBA. In other words if my 6000mAh pack consisted of 4 1500mAh P'd cells it would still be legal.

Ryan
Old 08-22-2008, 09:07 AM
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