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  1. #1
    RC Racer
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    Dec 2011
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    Converting to electric - Need help choosing batteries and electronics!!

    im gonna start off by saying that i dont have a revo, i have a slayer pro. they are built off the same chassis and share a lot of the same parts therefore i wanted to ask this question where i felt i would get the most expertise. dont hate on me cuz i posted this hear i am simply asking here cuz the slayer forum is dead and there are way more pros surfing this forum.

    im building this e-slayer cuz i hate the slash and i hate plastic chassis'. plus i used to have a revo that i loved so i figured i would change it up and couldnt go wrong with a truck built off the same chassis.

    enough of that. im using the tekno rc and the castle mamba monster esc and motor. so here are my questions. what batteries should i run 3s or 4s? what mah rating? what kind of run time could i expect with the battery you are suggesting b/c runtime IS important? and lastly should i go with mmm2650kv or 2200kv(im thinking 2650 because with the small tires of the vehicle it wouldnt need the torque of the 2200 and that the extra rpms of the 2650 may give it a little more speed of top end)?

    let me know what you think and if you have any experience in this area. thanks
    Last edited by redline870; 02-02-2012 at 12:23 AM.

  2. #2
    Marshal Double G's Avatar
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    Moving to the ERBE forum. The guys there know about the electric stuff and you will get more answers there. In fact, you could even look in past threads as this comes up a few times a month.
    The Super Derecho

  3. #3
    RC Turnbuckle Jr. 87 GN's Avatar
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    2200kv Revo is a heafty truck, like you said 2650 some for speed runs..
    You want speed = Voltage & gearing, but watch temps.
    2/2s = 14.8v
    2/3s = 22.2v
    I have yet to break a chassis, now the bulk heads, is another story (two set's of rears)


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

    MY BATTS:
    2S 9000 x 28C = 252,000 didide 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
    ^ 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.

    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....

    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 2s 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/ba...batteries/lipo

    most posted pic...
    Last edited by 87 GN; 02-02-2012 at 10:13 AM.
    Would you go flip my truck back over??

  4. #4
    RC Racer
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    Dec 2011
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    well im converting the nitro chassis to electric. i know its more money and more work but i absolutely do not want another plastic chassis car/truck. ill try and shoot for something like a 4s 14.8v 6000mah 50c battery or so, the tekno rc conversion kit only has one battery tray.

    what kind of speeds do you think could be achieved with a 3s battery and the mmm2650 system while still maintaining faster acceleration than a stock slayer 3.3? reason i ask is because a 3s battery is a lot smaller and lighter than an equivalent mah 4s battery which would give me better handling characteristics.

  5. #5
    RC Qualifier
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    acceleration differencies are really noticeable for every S you increase... we have tested on 2-3-4-5-6s. its not only the top speed. and it is significant

  6. #6
    RC poster
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    I have a few Tekno converted 3.3 revos and have the most fun with 5s. The set up I used to bash the most is a tekno 3.3 with a castle MMM and a 1518. It runs cool and fast enough for my skills. The other setup are mmm with 1515 on 4s and mmm with 1520 on 6s, the 1515 is in my mint platinum and does not see much use and the 1520 is just a little too heavy when using 6s.

    My batterys are turngy and gen aces brands and are all 5000 mah except for the 6s that is at 5600 mah and are 40c

    I currently planning to convert a spare tekno 3.3 revos to a slayer! Just at the planning phase and pricing out the slayer parts.

    Let me know how can I help and have fun.

  7. #7
    RC Champion
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    My vote is

    2650 on 4s = 39,220 RPM
    Or
    2200 on 5s = 40,700 RPM

    Either one is running at optimal RPM and means you will be more than satisfied.

  8. #8
    RC Racer
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    Quote Originally Posted by Just_now View Post
    I have a few Tekno converted 3.3 revos and have the most fun with 5s. The set up I used to bash the most is a tekno 3.3 with a castle MMM and a 1518. It runs cool and fast enough for my skills. The other setup are mmm with 1515 on 4s and mmm with 1520 on 6s, the 1515 is in my mint platinum and does not see much use and the 1520 is just a little too heavy when using 6s.

    My batterys are turngy and gen aces brands and are all 5000 mah except for the 6s that is at 5600 mah and are 40c

    I currently planning to convert a spare tekno 3.3 revos to a slayer! Just at the planning phase and pricing out the slayer parts.

    Let me know how can I help and have fun.
    you ran 5s and 6s batteries in a tekno converted 3.3 chassis? how was the balance of the truck? does that large of a battery mounted up that high on the chassis cause a lot of roll overs or poor handling?

  9. #9
    RC Racer
    Join Date
    Dec 2011
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    144
    Quote Originally Posted by 87 GN View Post
    2200kv Revo is a heafty truck, like you said 2650 some for speed runs..
    You want speed = Voltage & gearing, but watch temps.
    2/2s = 14.8v
    2/3s = 22.2v
    I have yet to break a chassis, now the bulk heads, is another story (two set's of rears)


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

    MY BATTS:
    2S 9000 x 28C = 252,000 didide 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
    ^ 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.

    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....

    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 2s 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/ba...batteries/lipo

    most posted pic...
    thanks for your informative post i appreciate the time you spent to write such a long post

  10. #10
    RC poster
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    Sep 2008
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    4
    The balance on 5s is not bad, but the 6s is a little top heavy, but for bashing it has no big issues on either battery. Keep in mind that my current driving skills might notice the balance issue!

  11. #11
    RC Turnbuckle Jr. 87 GN's Avatar
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    Quote Originally Posted by redline870 View Post
    thanks for your informative post i appreciate the time you spent to write such a long post
    nope just a cheater copy paste......lol
    did take a little time to work it up...
    Would you go flip my truck back over??

  12. #12
    RC poster
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    Great info and much needed, especially since I'm going electric.

  13. #13
    RC Turnbuckle Jr. 87 GN's Avatar
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    Quote Originally Posted by charles8102 View Post
    Great info and much needed, especially since I'm going electric.
    Well let me WELCOME you to the DARKSIDE... Alot of info to be had out there......
    Would you go flip my truck back over??

  14. #14
    RC poster
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    Yeah an overwhelming amount of info. Takes awhile to pinpoint certain info, plus understanding new & or different terminology (been out the hobby for a little bit) I'm "100% sure ill have a blast once my truck gets here though. Thanks 4 the welcome 2 the darkside

  15. #15
    RC Turnbuckle Jr. 87 GN's Avatar
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    Have you seen this yet? Test on Monday..hahaa
    Now I will welcome you to the denewboobafacation....
    Really get up to speed in the CASTLE LINK GUIDE. Do you have Lipos yet?


    AOD's links......


    Erevo 101:
    EREVO FAQ

    Lipo, LVC, Brushless & Battery charger/charging guides & purchasing links:
    TUTORIALS

    Refer to this to setup the Mamba Monster ( MMM ) esc for maximum performance:
    CASTLE LINK GUIDE
    or
    http://traxxas.com/forums/showthread...stleLink-Guide

    Refer to this to find parts, upgrades, batts & chargers etc:
    USEFUL LINKS


    Direct from Castle Creations ( the esc manufacturers ):
    MMM FAQ

    Driver's ED Manual

    LED warning light meanings
    Would you go flip my truck back over??

  16. #16
    RC poster
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    Nov 2010
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    I will have Gen Ace 7.4v 5300mah 30c lipos (bought used truck off ebay) with a tacon 2200kv brushless & spektrum DX2S radio with a spektrum sr3300t reciever. Since lipos are used, im preparing to buy new lipos, plus charger for lipos.

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