Are Zippy Lipos safe with a Castle MMM Speedy?

[Raze ST Truggy]

Originally Posted by fastbaja5b

After reading and rereading this I'm going to be err on the side of caution.

Polyquest 6000mah 25C 3s Lipos
http://www.rc-monster.com/proddetail...pq3s6000mah25c
Would they be more appropriate?

Those are some potent packs and are built with Enerland cells. With a 150A continous discharge rate I can't see those not being up to the job.





I
-Brian

[skellyo]

Originally Posted by fastbaja5b

After reading and rereading this I'm going to be err on the side of caution.

Polyquest 6000mah 25C 3s Lipos
http://www.rc-monster.com/proddetail...pq3s6000mah25c
Would they be more appropriate?

You may want to verify that the height of the 6000mAh pack will work in the Flux. I thought the trays were only 30mm, so I'm not sure if it will fit.

[fastbaja5b]

The Zippy H everyone uses are 51mm high which is shorter than these, actually the 2s Hardcase Lipos I use are 45mm so should be ok.

[skellyo]

Originally Posted by fastbaja5b

The Zippy H everyone uses are 51mm high which is shorter than these, actually the 2s Hardcase Lipos I use are 45mm so should be ok.

The thickness of the pack is what I'm talking about, not the width of the pack.

[Sammus]

6000s wont fit. Wish they would, theyre the ultimate powerful lipos :)

edit: oops sorry. wont fit in the erevo, didnt realise you were talking about a flux. dunno how big those trays are.

I now have about 3 months with the 3S 5000 20-30C zippys racing several times a week with two different trucks E-revo and e-maxx using the MMM 2200 combos. I can say these batteries are as good as any other battery i have bought for this application - includes neu energy and maxamps. Yes I gear for 40-45Mph. I have run them however geared for 55mph going up and down the street until we were bored with no issues.
I will point out that when going down to 4S with the neu energies the batts get VERY warm which is ok given the different voltage and increase in current.

I think all of this talk about zippy not safe with a MMM is hogwash. I have 3 MMM and had failures long before i got into the zippy batts.As a matter of fact i havent had a failure since we have been using Zippy's. Are they as high quality - i am not going to even try to argue because i am sure in extreme situations they arent as good as Mike's batts because we are sure they arent.
However I had a buddy open up a zippy-H and compared serial numbers to the PQ - guess what they are similar - their is a belief that these zippy H's are PQ Enerland 30C rejects - thats why they put 20-30C on the batt. for 50 dollars i can buy 3 of these vs a neu energy equivalent. I can say that they seem to be holding up better than the older generation of Maxamps batts 6000 and 8000 i was using till they all puffed. Although we have had much better performance out of the 8400 35C Maxamps (no puffing).
Time will tell for sure - ie how long will these batts last - how many cycles.

In the end its nice to know mike has the best batts if you need them.

[Sammus]

I thought the rhinos were enerland rejects or something because the cells are the same size and mah as a lot of PQs. The zippy cells have difference dimensions to any of the enerlands, so I'm pretty sure they come from another factory. That and even hobbycity tell us their cells come from a chinese factory, and enerland is korean as we all know.

[johnrobholmes]

Enerland has china factories now too.

[Sammus]

I stand corrected. I've still never seen enerland based packs that have a 150x50 footprint. could be wrong there too. maybe all the zippys are in fact re labelled PQ packs ;)

[Finnster]

Originally Posted by Sammus

I stand corrected. I've still never seen enerland based packs that have a 150x50 footprint. could be wrong there too. maybe all the zippys are in fact re labelled PQ packs ;)

Maybe PQ's are relabeled Zippy packs! 0_o

[Chadworkz]

Wow, I must say, I am now thoroughly confused and scared to death...heh!

A few details;
I have a nitro 3.3 Revo that I converted to brushless using Mike's RCM motor-mount and custom carbon-fiber Battery/ESC/RX trays that I made. It has the V3 MMM/2200kV combo running through the nitro transmission with a forward-only conversion, Pro-Line Bow-Tie MTRs on Pro-Line 23mm ½" off-set Velocities, a ton of carbon-fiber, titanium, & other lighter-than-stock parts throughout...and I am also planning on running the brakes & reverse via the motor.

I was planning on running a pair of Zippy Flightmaxx 4S 2650mAh packs in parallel for 14.8v @ 5300mAh, but am now questioning that choice after reading this thread, but wanted to ask a few questions before I make my final decision.

I am not a speed-freak, and I am not going to race, I just want a quick truck that is reliable enough to bash around the yard, in the chert-pit, and do jump-tricks off of my ramp...maybe 35-40mph max. Right now, besides the batteries, my biggest question is gearing, and about the transmission...

...is the overall gear-ratio of the nitro Revo transmission any different than the E-Revo transmission? If so, what spur and pinion would you guys suggest for my setup and what I want out of the truck, as well as if the ratios are the same for both transmissions? Like I said, I don't want all-out speed, just 35-40mph and reliability enough to do what I said above. As for the batteries I chose, I believe they will work just fine for my needs, but I really want to make sure before I damage something, and I would really appreciate help from you guys since you really know your stuff.

Thank you so very much for any help you guys can provide, it will be much appreciated!

P.S: I am going to run a set of Mike's V3 1/8 Revo Hybrid Diffs (buggy ratio) in the future, so I may need some help selecting a spur/pinion for that setup as well...

[fastbaja5b]

Originally Posted by Chadworkz

Wow, I must say, I am now thoroughly confused and scared to death...heh!

A few details;
I have a nitro 3.3 Revo that I converted to brushless using Mike's RCM motor-mount and custom carbon-fiber Battery/ESC/RX trays that I made. It has the V3 MMM/2200kV combo running through the nitro transmission with a forward-only conversion, Pro-Line Bow-Tie MTRs on Pro-Line 23mm ½" off-set Velocities, a ton of carbon-fiber, titanium, & other lighter-than-stock parts throughout...and I am also planning on running the brakes & reverse via the motor.

I was planning on running a pair of Zippy Flightmaxx 4S 2650mAh packs in parallel for 14.8v @ 5300mAh, but am now questioning that choice after reading this thread, but wanted to ask a few questions before I make my final decision.

I am not a speed-freak, and I am not going to race, I just want a quick truck that is reliable enough to bash around the yard, in the chert-pit, and do jump-tricks off of my ramp...maybe 35-40mph max. Right now, besides the batteries, my biggest question is gearing, and about the transmission...

...is the overall gear-ratio of the nitro Revo transmission any different than the E-Revo transmission? If so, what spur and pinion would you guys suggest for my setup and what I want out of the truck, as well as if the ratios are the same for both transmissions? Like I said, I don't want all-out speed, just 35-40mph and reliability enough to do what I said above. As for the batteries I chose, I believe they will work just fine for my needs, but I really want to make sure before I damage something, and I would really appreciate help from you guys since you really know your stuff.

Thank you so very much for any help you guys can provide, it will be much appreciated!

P.S: I am going to run a set of Mike's V3 1/8 Revo Hybrid Diffs (buggy ratio) in the future, so I may need some help selecting a spur/pinion for that setup as well...

No matter what you do someone somewhere will say it's wrong. I have run a converted Revo with a MMM speedy and a Medusa 36-60-2000 motor and it was fine that was running Reedy 5000mah 20C Lipos (2 * 2s packs)

so your set up should be ok from what I can see.

I think on 5/6s it's more critical than on 4s unless you gear down severely but then of course you risk an undergeared motor so either way ur stuffed lol!

My converted Revo, 4s Lipo stock spur and 14t pinion with the 2000mah was a handful but it was super reliable (now in the hands of a mate who is known to be a magnet for breaking things, but he hasn't yet!), yours should be even quicker, although with the extra torque of the MMM motor, I'd explore putting in the Robinson Racing metal gears inside the transmission!

Good luck with the project!

[Finnster]

Personally I think the whole thing is a bit of CYA from castle, and I would only really be concerned about it if I was pushing my system to the limit. What you are doing will not, and that just fine.

My first revo conversions used a MM on 4 and 5S and ran 10C batteries. they had no problems, but I didn't abuse them either. Decent batts and setup and it will be fine.

As far as gearing goes, use this calc of BrianG's IDK all the ratios, but its quite easy to just use the drop downs to get what you want. FWIW, I used 3.5v/cell and 6.7" sized tires to get the speeds I was seeing on my radar gun using maxx mashers. YMMV, but it gets you close. Aim for 40 and a ~32K rpm motor and you will be golden.

you wont have any issues at 35-40mph. these are ridiculous scare tactics being discussed here.

[Finnster]

What C rating are the batts btw? It should be at least 20 with that capacity. You want to be able to supply ~100A continuous. Else get bigger batts.
the 10C batts I had back in the day were 8000 mah, and were really more like 15C batts. That still 120A cont.