suicideneil
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Posts posted by suicideneil
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1) depends how brave you're feeling, I wouldn't leave it more than 2-3 days at most though.
2) As stated, conventional wisdom is to do a few 'gentle' discharge cycles to break-in the lipo before canning it. Bare in mind though not every brand labels their lipos accurately ( cough Maxamps cough ), so... yeah.
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3 hours ago, Seminole81 said:
So, looking into the batteries and charger I've got a bit more. Still haven't tested it. Big man's birthday is Saturday so plan on opening it up and throwing them on charge then and doing a few mods before taking the Quantum Flux out for a first run.
It appears the charger I bought doesn't have a battery status indicator. It's either charged or charging. So how do I do a storage charge on this? Is it a simple case of doing the maths?
4000mAh battery x 3000mA charge = 1.3hr for full charge (1hr 20 minutes). This doesn't take any other factors into account, nor does it take into account that the battery actually won't die. So if we say 20% left on when cut-off, that would mean full charge of about 1hr 4minutes? So with that in mind, if I just charged for 32 minutes after use that would give me the storage charge of about 50%?
Thanks in advance, and yes I will invest in a better charger soon 😄
You're asking exactly the same question you did before pretty much, so the answer is exactly the same too- nothing different about the advice that I/we can offer.
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6 hours ago, Seminole81 said:
Just looking at this charger more and the whole storage thing. It appears my charger doesn’t have that function nor does it have a 50% charged light. It’s either charging or not charging. So working it out, 4000mA battery x 3A charge = 1.3hrs for full charge, but that’s from dead (which should never happen) and doesn’t take any other factors into account. So for a “storage charge” should I just half the charge time for about 50-70% battery life?
In theory yes, in reality you really want a voltage checker for lipos so that you can actually see the individual cell voltages ( ~3.8v per cell for storage charge ). Better yet, buy a better charger- £30-35 gets you everything you need these days.
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10 hours ago, DogBone said:
Nice, thanks. I'll look them up.
Also about chargers. How good a one do I need? I was looking at etronix powerpal 3.0 ac/dc performance charger/discharge for £43. Any good or are there better ones for the money or do I need a REALLY good one?
There are more options than you can shake a stick at, depends how much you want to spend & how fast you want to charge your batts essentially- some light reading for the lipo / charger beginner: http://www.robotwars.00server.com/tutorials.html
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2.2v and 4.6v; yikes.
Something is very wrong with that pack- it may charge up correctly but for sure keep a very, very close eye on it and check the voltage at the end of the next run- they should never be above 4.2v ( charged ) or ~3.0v fully discharged ( per cell ). Wouldn't hurt to check the LVC ( low voltage cutoff ) is set correctly on the esc, assuming it has one.
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3 hours ago, Tels said:
Hi. How do you charge the battery if the charger refuses to charge the battery cause its too low?
My problem!
Being a brand new battery that isn't used? you might prefer to simply contact the seller and exchange it for a new one- depends if the cell voltage is just a little low, or it if there is actually a dead cell/broken wiring.
If it came from overseas then it might cost more to send it back and replace it than it's actually worth- if you don't get any joy there, then read this, section 4.9:
http://www.robotwars.00server.com/tutorials.html
This assumes the pack is undamaged and the wiring is good- might be worth using a battery meter or voltmeter to check each cells voltage first just to be sure they are only a little low, no dead cells as such.
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13 hours ago, Logie said:
Yea i understand the cutoff with the ESC but im wondering do Lipo give max performance untill you hit the cutoff?
Yes, pretty much- the discharge curve is pretty flat right until you reach the cutoff point, just after that it drops off a cliff.
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8 hours ago, Logie said:
With LIPO batterys, do they work full power untill you reach the cutoff voltage and the car stops? Been really impressed since going from nitro to electric. I have never run a battery low enough for the cut off. But a few of us are wondering do these lipos work then stop, not like NIMH where car gets slower and slow
The LVC ( Low Voltage Cutoff ) built into the esc is what stops the model from running when the battery voltage drops too low in order to avoid damage- the battery itself won't have any built-in protection as such and can very easily be damaged if you keep running after the cut-off voltage is reached- say, if the lvc is not set correctly or there isn't one at all on the esc. Below about 3v per cell is potentially enough to risk puffing the lipo, or the charger will throw up a warning that the cell voltage is too low and will refuse to charge it.
~3.2-3.3v per cell is a fairly typical LVC setting for reference, depends what settings you have available to tweak.
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On 12/07/2020 at 22:10, BlackpoolAndy said:
Hi peeps, I’m a tad lost...
You didn't buy the wrong battery- if the esc is rated for 2 to 4s then 3s is right in the middle, no issue there.
More likely the issue is either incorrect gearing, or possibly some binding in the drive train ( pinion and spur set too tight perhaps ). I would say look up a manual for the model if possible and see if there is a gearing chart; typically you need to gear down ( smaller pinion and/or larger spur gear ) when using higher voltages.
On a side note Deans connectors are the work of the devil- might be worth looking into upgrading to XT60s for a better connection.
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Hobbyking are based in China, but they have global warehouses- not much in the UK one usually though so.... yeah.
As for retailers- behold: http://www.robotwars.00server.com/usefullinks.html scroll down towards the bottom. I would also suggest modelsport as a good place to find lipos and a charger- won't end up waiting 2-4 weeks or more for delivery and dealing with import charges either.
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Hard case lipos aren't a must at all- not unless you're racing at some kind of event or track that requires them for safety reasons, or your model's chassis leaves the batteries quite exposed- not sure what model you have so you'll have to decide that for yourself.
If you can afford it, get the highest capacity you can that will fit your model- more mAh ( capacity ) will mean the battery is physically larger so keep that in mind- measure the battery trays and check the battery dimensions, buy the largest capacity/ highest c rating your wallet allows without going crazy.
What I will say however is that look into buying lipos from reputable UK retailers if you can ( assuming you're Uk based )- hobbyking is great because they have lots of cheap options but if there is a problem then you're pretty much out of luck- most of us have played that game before. Don't overthink it though- there are literally millions of options for lipos that would be suitable, check sizes, check wallet, stick with good/known brands- there is plenty of info and reviews to read into if you want 2nd opinions, research is fun...
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19 hours ago, Simon Hester said:
stuff and things
I wouldn't be too concerned about burst ratings on the esc/motor as any burst will only last for a split second under heavy acceleration. Provided your batteries are rated for at least the continuous current ( with a little overhead ) you'll be fine ( mAh x C rating ).
I wouldn't worry about the specs vs manual either- most Chinese brands will use the same manual for all of their escs as they have identical programming features- saves time & money on having different manuals for no real reason other than to change the voltage or current rating in the specs list...
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One of these, to replace my ancient Bantam BC6. Now I can charge a couple 5s 5000mah packs in just over an hour, rather than taking ~3-4 hours just to do one. Huzzah!
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14 hours ago, rocketsarefast said:
@suicideneil
Thank you for the polite response. I should not have called you stupid. I apologise. And yes you are right, I joined just to reply to your post. I must have been upset about something.
1. I must say though, I dont feel like your argument is very good. You would never assume someone means "ceramic capacitor", just because they did not say "electrolytic capacitor", so why would you assume "electrolytic capacitor" just because they do not say "super capacitor"?
I never assumed anything- they said 'capacitor', so I took it too mean they indeed meant 'capacitor'- it does no good to second guess the article by assuming they meant something else- saying capacitor instead of super capacitor is like saying car instead of bus. The article was badly written and omitted important facts- I merely took what they wrote at face value, hence calling it out as ridiculous. That said, knowing who makes the module I wouldn't be surprised if there was just an electrolytic capacitor inside, probably ~ 2200uF wired to the mosfet, lol.
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12 hours ago, rocketsarefast said:
@suicideneil
do some research first so you don't look stupid.
1. "30 Farad capacitor? That would be about the size of a gas cylinder."
Wrong. Its called a 'super capacitor'. I have several that are 10 farad and about the size of a AA battery.
here is one:
https://www.mouser.com/ProductDetail/AVX/SCCT20E106SRB?qs=sGAEpiMZZMsCu9HefNWqpmIe8hz%2fozG9tx3VFXPufJbc6gbFoK1N3g%3d%3d
2. "it can't increase the voltage"
Wrong. If you charge a capacitor in parallel with a battery, then quickly switch it to be in series with the battery, it will double the voltage. This can be done with a relay or a power mosfet. This is why it needs a dedicated switch, so you can remotely flip it from parallel to series.
Now, it does not say it doubles the voltage, it says it increases the voltage by 1S. So my guess is that they are not charging the cap directly in parallel with the battery, but rather charging it with a voltage regulator circuit.
Now we can argue about whether it is useful or not, but you cant say that the physics is impossible.
3 year necro post much? okay then, since it was requested:
1. The advert says '30 farad capacitor'- it says nothing about super capacitors- I know all about them though thanks to various electronics channels, but anyway. Calling me stupid for quoting the article makes you look stupid for not taking into account the context of my post.
2. Yes, if you wire it in series it will boost the voltage by whatever voltage it is rated for (briefly, as you noted ), however, the article says nothing about how it works or achieves this- so having an advert that simply states it boosts voltage by 'adding a capacitor' is extremely vague- that's what I was talking about when I said it couldn't increase the voltage ( without adding additional electronics to the capacitor unit, which we can't see inside of ).
More to the point though, if it boosts the voltage by ~1s lipo, and you're already maxed out on your esc voltage, that boost is likely to fry the esc; if you aren't maxed out, why not simply run a higher voltage battery? ( such a device would be illegal for proper races and only be much use for bashing, in which case my previous question and point stands ).
Why do people not take into account context, or give the poster some credit when they ask fair questions when faced with very vague marketing literature? And more importantly, why don't they check the last post date before joining up to a forum just to hurl insults at someone who wasn't wrong to start with? We may never know...
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and a 5k potentiometer- the Gmaxx is getting an upgrade and the DX6i is too ( being able to adjust gyro gain on the fly by using an unused channel slaved to the pot ). This may or may not end well...
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BL esc in Brushed mode is a nice option, you can always switch to a BL motor in the future if you so desire.
I seem to recall it being possible to power a servo directly from an rx pack or UBEC, and only having the signal wire going to the receiver- presumably the UBEC would need to be tied to the real ground wire on the esc. Whether that still works with a traxxas's newest generation of escs is another question, they aren't as 'user serviceable' as they used to be.
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I vote shell no.3. Truck looks superb, reminds me of something from the now extinct company Innerbeecrew- looking forward to seeing it in action.
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Checking in, sorry I'm late to the party- can't afford to miss a Candyman project...
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I may never have mentioned this, but I am in fact a big fan of the Alien franchise- first 3 movies especially. With that in mind, I bought... something ( non-rc, so sue me
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Having studied various other reviews and such, I have decided to do a partial tear-down and will replace the horrid, skinny pvc wiring and mini-tamyia connectors ( I think I cringed rather a lot when I saw those... ) with some much nicer, fatter, silicon insulated wire and EC5 connectors, along with a 2s lipo to power it. Will also do some light weathering paint effects to make it look 'used', rather than brand new.
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Ebay photo since I haven't 'installed' them yet, but I got 2 of these for my trucks:
seemed fitting, somehow...
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Having a clear out, decided to let go of my old but never ran Proline Slipstream shell. This has been custom fit to my Gorillamaxx G2 extended chassis, but should fit the newer style 3903/5/8 emaxx chassis with minimal work. Overall condition is very good to excellent, just a few small marks in the paint near the rear, and 4 small holes in the very rear where a wing mount once was located. Sale will include a custom rear body post mount- see pictures for details.
£25 posted, no offers or trades, payment via paypal.
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8 hours ago, atom3624 said:
Is that the actual one they drove over with the truck in the original publicity for it? !!
Al.
Looks like it, I'll say that much- every single piece is bent to some extent, and the bottom plate has one corner snapped off ( luckily I won't be using that part ). I'm not too worried as I have a big hammer, and I'll be doing lots of choppy-choppy work, so it'll look fabulous when I'm finished
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Snagged this ratty, bent and slightly knackered looking thing from ebay ( ebay photo ):
A very rare RC Solutions rollcage for the emaxx 3903/5/8 or traxxas bigblock tmaxx. I have plans for modding this to make it fit my GorillaMaxx...
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Electric Guide
in General - Electric
Posted
Oh man, I didn't know those were a thing- leave it to traxxas to come up with a proprietary combined power and balancing connector style of plug for their models, batteries and chargers. That's awful ( for consumers- beginners to the hobby especially ).
You'll need a specific style of extension lead with the proper male and female connector on the end that is compatible- if you google for 'traxxas id extension cable' you'll find plenty of options thankfully, not worth trying to make your own given everything you'll need to buy and solder together just to make a couple leads.