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  1. #1
    RC Enthusiast
    Join Date
    Aug 2012
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    29

    lipo battery help

    Looking to buy a new set of 5000mah lipos. I need 2 2s lipos for a total of 4s. I don't understand the difference between a battery that is 2s2p and a battery that is 2s1p. I have a set now and I don't really know what they are....they seem to work just fine. 2, 2s lipos, 5000mah, 7.4v each, paired together for a total of 14.8v. I thought that would be a good sweetspot for my esc/motor combo. I bought my original lipos based on them being 2s and 7.4v....I was not aware of the 1P/2P thing. Now, I'm looking for a set for my son and don't know what to buy. Any help from the battery experts out there would be appreciated

  2. #2
    RC Racer
    Join Date
    Feb 2012
    Posts
    142
    Thinking of these by cells - the 2S1P is only 2 lipo cells wired in series (the S number is the # of cells wired in series) and the 1P is actually redundent in this case - adds nothing other than to say there's no cells in parallel (1 cell in parallel makes no sense, this is uaually omitted for 1P type pacs).

    The number associated with the P is the number of cells in parallel. Your 2S2P is made up of 4 cells - there are 2 sets of 2 cells wired in series. The pair of 2S cells are wired together in parallel for 2S2P.

    Wiring in series doubles voltage, 2S = 2 X 3.7v = 7.4v nominal, but keeps the capacity the same. If these were 1S 5000mah cells, wired together, you'd have a 7.4v 2S 5000mah lipo. When you wire in parallel, voltage doesn't change, but capacity doubles. So the 2S2P if made from 5000mah cells would be a 7.4v 2S 10,000mah (2x5000) lipo. Running in parallel is typically done to increase run time.

    here is a list of batteries ( provided by 87 GN on a different thread )


    "Ichargers...


    This is a good start..
    Just don't buy no name Ebay batts...

    MY BATTS:
    2S 9000 x 28C = 252,000 divide 1000 = 252 amps
    2S 8000 x 28C = 224,000 divide 1000 = 224 amps
    3S 5200 x 40C = 208,000 divide 1000 = 208 amps
    2S 4700 x 25C = 117,500 divide 1000 = 117.5 amps
    I run in my Summit.. ^ Requires proper gearing^


    ( mah x c rating / 1000 = amps),

    The
    more amps the better / minimun of 120 amps.

    The ESC will only draw the amount of amps it needs.

    Higher the mAh the longer the runtime.
    For brushless systems 8000 mAh about 45 min & a 5000 mAh about 30 min.
    Times are longer for brushed systems.


    Batts in series double the voltage:
    2x 2s 20c 5000mah = 4s 20c 5000mah

    Batts in parallel double the mah capacity:
    2x 2s 20c 5000mah = 2s 20c 10,000mah.

    A temp gun is kind of a must have.....

    Hot motor + cool esc = under geared.
    Cool motor + hot esc = over geared
    Everything warm just right..

    Motor ~ 180/190*F maximum, ideally 140/160*F, temps can be 10* higher inside the motor
    ESC ~ pretty much same temps / Fan comes on @ 150*F
    Lipo's ~ 140*F max, ideally 100/120*F

    Besure to check sizing before you buy any batteries...

    In time some batteries will become discontinued...


    No particular order as to good, better, or best....

    2S

    With larger Lipo battery wires, you might need to - enlarge the exit hole on battery doors....
    or run wires out the vents..

    Direct Fit...........
    2s GensAce 5000 mAh 40c
    2s Gensace 5300mah 30c softcase packs
    2s HiCountryHobbies/Billowy Power 5200 mAh 50c
    2s Hyperion 5000 mAh 45C Soft
    2s RC DUDE Power 5000 mah 35c
    2S Sky Lipo 5000 mah 40C -- fit snugly
    2s SPC 5000 mah 25C hard case
    2s SPC 5200 mAh 40C
    2s SPC 5400 mAh 50C hard case
    2s SPC 6000 mAh 30C hard case
    2s SPC 8200 mAh 30c
    2s SMC 5400 mAh 50c
    2s SMC 6000 mAh 28c
    2s SMC 8000 mAh 28C Soft Case Lipo
    2s SMC 9000 mAh 28C Soft Case Lipo
    2s SMC 9200 mAh 50C
    2s Team Orion carbon 7000 35c
    2s Thunder Power 45-90c 5000mah
    2s ******* ******** 6000mah 25-50c
    2s Traxxas 5800 mAh 25c
    2s Traxxas 7600 mAh 25c


    Mod's.............remove retainers & back out or trim screws if they extend into battery compartment
    2s SPC 8200mAh/40C
    2s ******* 30c 5000 mAh soft - Extend Batt Door Out
    2S ******* 5200 mAh 5.2 Hard Case - Trim Batt Door For Wires
    2S ******* 5000 mAh 5.0 Hard Case - Trim Batt Door For Wires
    2s ***** ********* 5000 mAh 30C hardcase



    3S
    Direct Fit..............
    3s Hyperion 5000 mAh 45C Soft
    3s Max Amps -6000xls
    3s Team Orion Carbon 4700 mAh 45C
    3s Kypom K6 6000 mAh
    3s RC DUDE Power 5000 mAh 35c snug 29mm tall
    3s HiCountryHobbies Billowy Power 5200 mAh 50c snug 28mm tall
    3s ***** 5000 mAh 30c
    3s *********x 5800 mAh 30c

    Mod's..............remove retainers & back out or trim screws if they extend into battery compartment
    3s SMC 5600 mAh 50C
    3s SMC 5500 mAh 28c
    3S SPC 5200 mAh 40C soft case
    3s SPC 5400 mAh 50C soft-case
    3s Thunder Power 3s 45-90c 5000mah
    3s Traxxas 5000 mAh 25c
    3s ******* ******** 6.0 6000 mAh 25-50c
    3s ******* 5000 mAh 30c soft - Minor Mod/Extend Battery Door Out



    4S
    4s ******* 4000 mAh 30c - Minor Mod/Extend Battery Door Out (Same size as the ******* 3s 5000mah 30c soft)

    Traxxas link to batteries
    http://traxxas.com/products/parts/ac...s-applications
    http://traxxas.com/products/models/e...less-batteries


    battery compartment:
    "

  3. #3
    RC Enthusiast
    Join Date
    Aug 2012
    Posts
    29
    WOW, that's a lot of information. Thank you....I hope you used copy and paste. All I really want to know is what are most people buying or the most common type of 2S battery. I'm looking for 4S total and 5000mah. If I take 2 batteries, both 2s 5000mah and connect them in series to the ESC, then I get 4S total and 5000mah, correct? If I take 2 batteries, both 2S2P 5000mah, and connect them in series to the ESC, I end up with the same thing do I not? 4S total and 5000mah.

  4. #4
    RC Racer
    Join Date
    Feb 2012
    Posts
    142
    errrrrr.

    One way you'll get 2s 5000mah + 2s 5000mah = 4s 5000mah ( which is what you want )

    other way ( which you won't use... ) 2s 5000mah + 2s 5000mah = 2s 10000 mah

  5. #5
    RC Turnbuckle Jr. 87 GN's Avatar
    Join Date
    Mar 2010
    Location
    kansas
    Posts
    7,835
    he is correct...


    just make sure (most are) the battery you pick says 7.4v 2s. Get two batts & plug them in. The Stock ESC is wired in series, so you will have 2/2s = 4s... good to go..
    Would you go flip my truck back over??

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