NEWS FLASH

MARDAVE TO RELEASE 1s LIPO AND VOLTAGE BOOSTER

LOL i thought you were winding me up

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EDIT UP DATE

4800 - 40C rated £24.95

and Lipo Booster

4Size, L33xW27xH13 4Weight, 17.0grams4LEDs, 1 on board 4Boosts 1 cell (3.3-4.2V) up to 6V regulated4Maximum current, 3Amps4Lipo cell protection4Power LED on board4Universal plug fits almost all receivers4On/Off switch £26.95


Made by Mtronics

mardave

30 year old chassie that keeps up with the times, its fantastic

So if I go brushless and lipo is this the best one to get?

yet to know that buddy, the cell looks like a soft cell though so i would buy a hard case lipo and a standered lipo booster.

The best booster around is the RC Dynamics booster cracking bit of kit although more expensive than the mtroniks/Mardave one..... But it's a fit n forget :-)

Can anyone tell me who does the Mardave 1s Lipo have what seems like a balance lead coming out of the hard case

It's should only be 1 lipo inside that hard case

because its made up of more than 1 cell to get the 4800mah

where most are 1cell LiPo literally one big cell but big like a "D" size torch battery then you have the AAA size small but both are 1.5v but no amps so there is more than 1cell in the mardave one


here is a picture of whats in a 2s LiPo
[You must be registered and logged in to see this image.] Yep 2 cells ( 2s )

so you get this formula

•3.7 volt battery = 1 cell x 3.7 volts
•7.4 volt battery = 2 cells x 3.7 volts (2S)
•11.1 volt battery = 3 cells x 3.7 volts (3S)
•14.8 volt battery = 4 cells x 3.7 volts (4S)
•18.5 volt battery = 5 cells x 3.7 volts (5S)
•22.2 volt battery = 6 cells x 3.7 volts (6S)


Now the LiPo mardave are selling MUST be 2 or 3 cell but very small amp so its wired to give the 3.7 volt but NOT 1 Cell
so could be made up of smaller one's to get the Amperage . . . .
Have you seen the small indoor planes at Ardent imagine these small LiPo's

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wired but in a case to give 4800 MAH

Hope that helps

OMG...... series doubles the voltage 2s = 7.4v, 3s means 3x.

Parallel 2p = same voltage double the current, simple electronics Gazza, if you dont know just say i dont know...! your steering people very wrong here.

Portable equipment with high-energy needs is powered with battery packs in which two or more cell are connected in series. Figure 1 shows a battery pack with four 1.2-volt cells in series. The nominal voltage of the battery string is 4.8V.

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dirtyghost wrote:OMG...... series doubles the voltage 2s = 7.4v, 3s means 3x.

Parallel 2p = same voltage double the current, simple electronics Gazza, if you dont know just say i dont know...! your steering people very wrong here.

Portable equipment with high-energy needs is powered with battery packs in which two or more cell are connected in series. Figure 1 shows a battery pack with four 1.2-volt cells in series. The nominal voltage of the battery string is 4.8V.

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Isn't that what he said?

If there's more than one cell in that pack but still nominal voltage of 3.7v then it must be a 1S2P arrangement - common in RC aircraft but surprised that not more common in cars...

Either way, 2 cells means it's a good idea to balance them!

Gazza wrote:because its made up of more than 1 cell to get the 4800mah

where most are 1cell LiPo literally one big cell but big like a "D" size torch battery then you have the AAA size small but both are 1.5v but no amps so there is more than 1cell in the mardave one


here is a picture of whats in a 2s LiPo
[You must be registered and logged in to see this image.] Yep 2 cells ( 2s )

so you get this formula

•3.7 volt battery = 1 cell x 3.7 volts
•7.4 volt battery = 2 cells x 3.7 volts (2S)
•11.1 volt battery = 3 cells x 3.7 volts (3S)
•14.8 volt battery = 4 cells x 3.7 volts (4S)
•18.5 volt battery = 5 cells x 3.7 volts (5S)
•22.2 volt battery = 6 cells x 3.7 volts (6S)


Now the LiPo mardave are selling MUST be 2 or 3 cell but very small amp so its wired to give the 3.7 volt but NOT 1 Cell
so could be made up of smaller one's to get the Amperage . . . .
Have you seen the small indoor planes at Ardent imagine these small LiPo's

[You must be registered and logged in to see this image.]

wired but in a case to give 4800 MAH

Hope that helps

Gazza I know what a 2s lipo looks like inside a case as I've owed soft cell lipo's before!!

I asked why the Mardave had what looks like a ballance lead as I HAVE NEVER seen a 1s lipo with a balance lead attached before thats the whole beauty of running a 1s lipo as you DONT have to balance it!!

Also where you say "Now the LiPo mardave are selling MUST be 2 or 3 cell but very small amp so its wired to give the 3.7 volt but NOT 1 Cell! Dont you mean voltage?? if so then as far as I'm aware you cannot get a lipo lower than 3.7v (per cell)!

I think as Quacking Plums says....they must be wired in 1S2P configuration.....only question is WHY did Mardave go down this route???

Thanks anyway Gazza for trying to explain it to me

The lipo seems to be of a vapex origion i think.
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So he probley just brought a bulk buy in from vapex?

Also why it has a balance lead mabe it has two cells wired in parallel so that it doubles the capacity but same voltage

dirtyghost wrote:
Parallel 2p = same voltage double the current,

Errr thats what I said Marti and pointed out by Eric & Nick as well

Agreed i miss read i think.....i must of apologies

LOL u getting this cold marti

Still very odd for Mardave to go for this type of lipo which means it has to be balanced!! I know I will not be buying one of them!

4_cell_racer wrote:
... as far as I'm aware you cannot get a lipo lower than 3.7v (per cell)!

I think as Quacking Plums says....they must be wired in 1S2P configuration.....only question is WHY did Mardave go down this route???

For reasons I won't go into, yes, lipo is 3.7v nominal per cell.

The confusion comes really because people say 1S but mean 1cell, when 1S only really means 3.7v (when applied to lipo). 1S1P, 1S2P and 1S999P would all be 1S because the configuration would still only give you 3.7v nominal. Nobody tends to quote the 'P' bit!

Remember that when you put batteries in parallel, both the current handling and capacity are added together. A 1S 4800mAH 40C pack is probably two much cheaper 2400mAH 20C packs in parallel.

Stox217 has confirmed this as that link to the vapex pack is indeed 1S2P. Two cells means it's a good idea to balance them, though really in a P configuration they are automatically balancing whenever you unplug them anyway...

Thanks for explaining that QuackingPlums

BTW I had a feeling they were Vapex as I'm watching Vapex auction on fleebay!!

Sorry but a balance plug on a 1S lipo no matter how many cells in Parallel is a load of manure! Unless you could phisically/electrically disconnect the individual cells from one another then the balance lead would connect to all the cells anyway no matter where you put it in the configuration rendering it absolutly pointless! As has already been said multiple cells in parrallel balance themselves.....

BTW most 1S hardcase mardave/12th pan LiPos are 2 cell parrallel (and no they don't have balance leads!)

2nd or 3rd that, I would have thought self balancing.

Its because in a series circuit the same current has to circulate through all cells so they can become unevenly charged, but in a parallel circuit, if say for example one cell is already charged its possible for a discharged cell to charge itself independantly.

Richard

I see these possible options:

1. It will actually be a 2S lipo @ 7.4v hence the need for a balance plug. Unlikely as the LiPo booster would not be required.

2. The picture is 'generic' and is not the actual pack but a similar one with more cells in series. I would think the most likely option.

3. Some twit actually has put a balance lead on a 1S LiPo. You never know.

4. The laws of phisics/electrical laws have changed since I last checked.

5. Hmm can't think of any more at 5:00am

EDIT: Found the battery in the pic on Vapex's HK site [You must be registered and logged in to see this link.] and it is a hard case 1S2P with a balance lead pictured, why it has one is beyond me

LMAO@No4

The only useful purpose I can think of is to detect if a cell isn't taking charge at all. Whilst a fully functioning pack will self balance if wired in parallel, there's nothing to stop one of them from dying and refusing to charge at all. In this situation the balancing circuit *should* (might?) notice something is up and stop the charging process.

Nope, just sees it as one cell, a balance lead cannot possibly tell one cell from the other without there being complicated electronics inside the cell, as if there would be

Well I must admitt haveing not opened my case on my 1s LiPo I'm thinking there is just 1 cell in side

But if there is two cells in side like the Mardave one then yea you will need a Balance plug

I think its like the 1s saddle packs 2 cells make 1 1s Lipo so there fore a Balance lead is required

But with out opening 1 up a think you are all guessing

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as above this is a 1s lipo ( saddle pack )

now imagine this in a SINGLE case to make a 1s lipo then the balance lead makes sense. . . .