High capacity compact LiPo for T72 and T90 6.0

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Postby Jay-Em » Sat Feb 29, 2020 10:04 am

For those that are not too afraid of LiPo batteries, and are disappointed by the low capacity 1800 LiIon batteries Heng Long puts into the T90 and T72 ( with their smallish battery compartment) there’s a solution.

LiPo Batteries for the Tamiya Dancing Rider ( funny, small trike rc) fit like they were máde for the new 6.0 equipped T72 and T90.

https://tamico.de/navi.php?a=217649&lang=eng

Edit : Also in the UK : https://www.modelsport.co.uk/arrowmax-lipo-3200mah-7-4v-t3-01-dancing-rider/rc-car-products/431887

The LiPo battery is 3200 mah, 50c continuous, and 100c peak power. And it’s absolutely tiny.
It’s almost asif Heng Long planned to use this type of LiPo, the fit is thàt precise. Only thing is that it needs a new connector or a T-connector to Tamiya molex adapter.

Remember : The battery ónly fits the nèw T72 and T90 that have the 6.0 controller, since they have a bulge in the battery compartment and the Arrowmax battery is rather high/square ( about 30mm x 30mm)

I get móre than an hour of use ( all-metal equipped, heavy T72) in various terrain with the smoker running ( the new smoker is a tad thirstier than the old one... but, my wòrd, does it work!)
Last edited by Jay-Em on Sat Feb 29, 2020 10:58 am, edited 2 times in total.

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Postby jarndice » Sat Feb 29, 2020 10:15 am

Great tip, Thank you,
Last edited by jarndice on Sat Feb 29, 2020 10:20 am, edited 1 time in total.
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Postby jarndice » Sat Feb 29, 2020 10:19 am

Great tip, Thank you,
That looks like a "Deans Connector",
Plenty of dealers offering Deans/Tamiya Adapters for very little money.
www.componentshop.co.uk will change the connection at no cost or so I am told :haha:
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Postby Jay-Em » Sat Feb 29, 2020 10:45 am

Ah. Very nice. That little problem fixed also.

‘Deans’ or ‘T-connector is - by the way, a bit of licensing jiggery-pokery, I believe. ‘Deans’ is a protected copyright.
(Poor newbies that have to fight their way through all those different names for the same things..)


Just discovered it’s available in the UK too.. but at what price??. 40 quid??.? ( Wheelspin) :O My word! For that price the €13.- extra for shipping from Germany, is worth it... Get a couple of them, and it’s even more attractive..

( I love those super compact batteries. They’re light, and fit in almost every weird contraption I fiddle with, say snowmobiles or rc surfboards, or tiny jetboats or smallish airboats :D )

Ah.. MUCH better : https://www.modelsport.co.uk/arrowmax-lipo-3200mah-7-4v-t3-01-dancing-rider/rc-car-products/431887

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Postby Rad_Schuhart » Sat Feb 29, 2020 11:08 am

Check at hobbyking, you might find the exact size for 1/3 the price.
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Postby silversurfer1947 » Sat Feb 29, 2020 11:30 am

Best I can find at hobbyking with the right dimensions is only 850mah
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Postby Jay-Em » Sat Feb 29, 2020 11:33 am

Rad_Schuhart wrote:Check at hobbyking, you might find the exact size for 1/3 the price.


Nope. Checked. Afa I can see, sadly only in tiny, max 800mah capacities.

Hence why I jumped on the Arrowmax batteries an bought a bunch of them. Quite a unique size and capacity, it seems.

By the by, also a great size to separately power amp-guzzling extra’s like a big amplifier in our tanks. Taking power for those from the main battery, usually creates all sorts of ground-loop like problems. Not so with a separate power-source.

A 10watt Visaton, a 15watt mono amp, and the neighbours storm outside, wondering what maniac is idling a jet engine on their front porch ( Abrams M1) 15 réal watts are LOUD.. :haha:

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Postby Rad_Schuhart » Sat Feb 29, 2020 12:25 pm

Are you 100% sure? Because I bought plenty of batteries with different shapes... Can you tell me how big is the room for the battery? Maybe I can find something cheaper for you.

Yeah, I love saving dough, lol
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Postby Max-U52 » Sat Feb 29, 2020 12:32 pm

Try chinahobbyline. They've got more batteries than you can shake a stick at.
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Postby Jay-Em » Sat Feb 29, 2020 2:01 pm

Rad_Schuhart wrote:Are you 100% sure? Because I bought plenty of batteries with different shapes... Can you tell me how big is the room for the battery? Maybe I can find something cheaper for you.

Yeah, I love saving dough, lol


7 x 3 x 3 cm max. ( L x W x H )

BTW Chinahobbyline (terribly slow site btw) is also only low Mah and vèry low C-values. Mostly TX and RX packs. They will puff in high-amp applications.

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Postby Rad_Schuhart » Sat Feb 29, 2020 7:16 pm

Jay-Em wrote:
Rad_Schuhart wrote:Are you 100% sure? Because I bought plenty of batteries with different shapes... Can you tell me how big is the room for the battery? Maybe I can find something cheaper for you.

Yeah, I love saving dough, lol


7 x 3 x 3 cm max. ( L x W x H )

BTW Chinahobbyline (terribly slow site btw) is also only low Mah and vèry low C-values. Mostly TX and RX packs. They will puff in high-amp applications.


I checked, with every update the hobbyking website seems to work worse and worse.

Anyway, I have not been able to find a battery with such a good mah rate.

It makes me wonder if what tamico is stating is correct or fantasy. I dont want to talk bad about them, maybe they are the most honers sellers in earth and those batteries are super good, dont know, but it is not the first, nor the second, nor even the third time I buy batteries rating a much, much bigger amp rate than what they really have...

So yeah, if you try those batteries, update the thread, I am sure plenty of people will find it interesting!.

If not, you can do as I do, to get two big quality 18650 cells, wire them together and enjoy a reliable pack with 3.500 mah. But I understand not everybody is willing to mess doing it. Is not somethign I like to do neither.
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Postby Jay-Em » Sat Feb 29, 2020 8:51 pm

Ah, but the problem is the tiiiiny battery compartment in the T72 and T90, so, no space for two LiIons.

The stated Amps are about correct, charging puts about 2900mah in them after the IIPo cutoff in the Heng Long Controller cuts the power.

Bottomline: They run quite a bit longer than the 1800’s Heng Long provides. With high C-values as a boon. No sudden switching-off as the HL LiIons tend to do when using the drive motors and turret rotation ànd firing bb’s. How the 6.0 controller fares under that draw on the long run, I do not know. It doesn’t get too hot. But that doesn’t mean it’s not working too hard... We’ll see.

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Postby Max-U52 » Sat Feb 29, 2020 10:44 pm

Chinahobbyline couldn't compete, either. The best they could do in that space is 1500 mah.
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Postby Jay-Em » Sun Mar 01, 2020 1:20 pm

Hah... found out hòw exactly they succeeded in cramming 3200mah in LiPo slush in it. The doubts about the capacity kept bugging me, so, I took a somewhat scientific :P approach :

Took a soft case Red Power 2200mah, measured and weighed it. If You fold that red power over in half, it’s shorter, but exactly the same height as the Arrowmax. Red Power weighs 105 grams, Arrowmax almost 120grams. ( same type and length of leads and connector)

Closer inspection revealed that they just connected 2 x 2 cells in parallel and stacked them. That makes sense. 1 smallish 1600 mah 2 s can be made in 6 x 3 x 1.5 cm. Stack two, and hey presto! Double capacity. Only cost is that it’s rather high at 3+ cm. Plùs the fact that 2 cells in the arrowmax, when layed-out/ unfolded, are more than 1 cm longer than any of my 2200 mah packs, enough space extra to cram-in 125mah in last-gen LiPo slush.( remember 2 x 2 cells in the arrowmax)

Clever. LiPo tech and chemistry keeps improving.

(The things that keep One occupied on a lazy Sunday.. :haha: )

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Postby john glazbrook » Fri May 01, 2020 4:51 pm

try this one for compact li-ion battery it comes with a Tamiya plug, and is rated at 3,500mah 2s priced at 28.49 euros plus potage and its in ther stock (no I am not there agent)website is www.motionrc
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Postby Exhibitedbrute » Fri May 01, 2020 6:55 pm

Looks like that will be an ideal battery for the crusader when I get that running as space in that thing is rather limited

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Postby Jay-Em » Tue Jun 23, 2020 12:11 pm

john glazbrook wrote:try this one for compact li-ion battery it comes with a Tamiya plug, and is rated at 3,500mah 2s priced at 28.49 euros plus potage and its in ther stock (no I am not there agent)website is http://www.motionrc


If the power is indeed only 3c ( I hope it’s a mis-print) You’re in for a rude awakening when You punch the throttle ànd try to shoot, or have a smoke generator running.... C-value works like this : capacity X c-value = max amp draw. In this case it can only deliver about 10 amps. That’s a bit lower than an average Heng Long plastic tank will draw with everything running. Let alone a fully metal equipped one. Driving will work, shooting will work, turret rotating will work.... until You try those functions all at once.

With my 6.0 controllers, the stock Heng Long LiIo packs often kick off the LiPo cutoff, forcing a restart of the tank. Quite annoying tbh. Hence my preference for either high capacity Nimh, or high C LiPo.

Even a humble NiMh pack can muster between 5c and 10c, up to 15c for the high quality cells.

It works.. like a set of dry batteries would work. But don’t be surprised to have the LiPo cutoff spoiling the fun quite often.

If You purchase some, let us know how it goes. Maybe I’m a bit too gloomy, and it works like a charm. Only one way to find out.

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Postby General Jumbo01 » Tue Jul 07, 2020 8:36 pm

Having purchased a T-90 with a 6.0S from Forgebear a couple of months ago (great price / service btw) l found that the stock 1800 mah pack was infact made up by a pair of 3.7v 18650 li-ion cells, the type used by vaping devices.

Looking for spares, l bought a few 4000 mah examples from Banggood. They were a deadloss, nothing like 4000 and very low amp output causing the mfu to restart often. Not to be put off, l then purchased a box of GP 18650 2600mah and these are fine. For info the tank is a 'plastic' type with the new steel gearbox.

Given time, l plan to find an alternate space for a pack of a different type.
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Postby tankme » Tue Jul 07, 2020 11:53 pm

My new T-72 was the same way. It's two 18650s and seems to be rated for 1800mAh. I have some quad cell 18650 packs that are 7Ah I'm going to try.

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