EVERCROSS EV12M Kids Ride On Motorcycle

[adamsowy]

Hi Guys, I bought the above motorbike for my 6 year old son at the beginning of this year and I am looking for to make it a bit faster as a winter project and so my son can enjoy using it (spring 2025) a bit more as he keep asking me to make it quicker. I was hoping that a controller replacement would be enough. I can not find any specific information about the current controller so not sure what to get.

A link to the manufactures website for the controller replacement.

Can anyone please advise what can be done to make it a bit quicker, max 22mph instead 15mph? Thank you.

 

[matthewslack]

Pictures seem to show no front brake. At 22mph, kinetic energy is more than double that at 15mph, so (a) twice as damaging in an 'off' and (b) in need of more stopping power.

My vote is for don't do it.

 

[adamsowy]

Pictures seem to show no front brake. At 22mph, kinetic energy is more than double that at 15mph, so (a) twice as damaging in an 'off' and (b) in need of more stopping power.

My vote is for don't do it.

Thanks for replying, I agree with you 100% however I still would like to make it a bit faster.

 

[thelarkbox]

before attempting any controller upgrades check the battery drain capacity, in all likelihood its built to cost with the cheapest battery that can provide just enough power to carry a toddler at its max speed as is.

Attempting to drain more power than the battery can supply will in the best case result in the battery BMS protection cutting in and cutting off the power, or in the worst case.. well we all know what lithium batteries do in the worst case..

 

[Ghost1951]

Pictures seem to show no front brake. At 22mph, kinetic energy is more than double that at 15mph, so (a) twice as damaging in an 'off' and (b) in need of more stopping power.

My vote is for don't do it.

Too true. My sons hurt themselves badly enough on bikes under their own power, let alone a 22 miles an hour motorbike. I've seen some of the Heli Med videos with young teens lying on the ground in agony with a bone sticking out of their trouser leg after a spill on a motorcross bike.

 

[saneagle]

That looks like a brushed motor controller. Unlike our brushless ones, brushed motors don't like giving much extra power. You can use any 36v brushed motor controller you want, but it might not make it go any faster. Lift the wheel off the ground and see what speed it spins up to. If it's still 15 mph, the same as when you ride it, the controller has a speed restriction, in which case a different one might release it. If it's the power that's limiting the speed, you could try a 15A controller, but it depends what battery you have. You can't get more power if the battery is only small. The listing says 4Ah!

if you want proper advise, you need to give us a lot more info.

 

[esuark]

Too true. My sons hurt themselves badly enough on bikes under their own power, let alone a 22 miles an hour motorbike. I've seen some of the Heli Med videos with young teens lying on the ground in agony with a bone sticking out of their trouser leg after a spill on a motorcross bike.

Quite agree. There was a place I used to practice when I competed in motor cycle trials. I came past one day in the car to see a guy laying on the ground I turned around to investigate and found him on his own lying there with a second knee joint halfway down his shin. I had to call for the emergency services to help him. Needless to say I never went practicing on my own ever again.

 

[adamsowy]

@saneagle please advise what kind of extra info would you like?

I have asked the manufacturer of the motorbike for more info about the original controller but it seams to be like I am being ignored and getting nowhere

I bought this https://www.ebay.co.uk/itm/166867589441?var=466538990458 36V500W option and it's meant to arrive today.

According to bike's manual it can do 15mph max but I feel like thats on normal terrain but he doesn't use it much on normal terrain but on grass and tracks and I don't even think this bike can do 10mph on difficult terrain. I don't want to make my sons bike to be "the beast" just a bit quicker.

 

[saneagle]

@saneagle please advise what kind of extra info would you like?

I have asked the manufacturer of the motorbike for more info about the original controller but it seams to be like I am being ignored and getting nowhere

I bought this https://www.ebay.co.uk/itm/166867589441?var=466538990458 36V500W option and it's meant to arrive today.

According to bike's manual it can do 15mph max but I feel like thats on normal terrain but he doesn't use it much on normal terrain but on grass and tracks and I don't even think this bike can do 10mph on difficult terrain. I don't want to make my sons bike to be "the beast" just a bit quicker.

That's most of the information needed. You're limited by the battery. We still don't know what cells are in it, but 10 amps from a 4Ah battery is a lot. It might be able to go as high as 15 amps. If you try that, you need to proceed with caution because there's always the possibility that it could overheat and catch fire. It might be an idea to run it at full power at its present 10A for 10 minutes to see how hot it gets. The only safe way to proceed is to get a new battery of known capability.

The motor will probably be OK up to 15A. Again, you can check to see how warm it gets at its present 10A.

The 250w to 1000w mentioned in the controller listing don't mean anything. You buy a controller according to its rated or maximum current, which isn't mentioned in that listing.

Finally, your battery is a cheap escooter one. If you try to drag too much power from it, it'll overheat a catch fire in a catastrophic way. Have a look at YouTube videos of scooter fires to get an idea of what that means. My advice would be not to go higher than 15 amps and be very careful about checking any increase at all over the present 10A. You're playing with fire, literally. It would be safer to get a better battery. Motors burning out usually just make a bad smell. They don't burn your house down.

 

[adamsowy]

@saneagle I have no idea what are you talking about I’m not a sparky

all photos I posted so far is the stock components fitted by manufacturer

not sure what you mean by:
1. 10 amps from a 4Ah battery is a lot. It might be able to go as high as 15 amps. If you try that, you need to proceed with caution. I always proceed with caution however how can I try (achieve) 15amps?
2.My advice would be not to go higher than 15 amps

I honestly have no idea how to increase amps

the new controller is 36v500w (picture attached) I mentioned it in the post as the auction is for a few types

Are you saying that replacing the controller won’t make a difference?

What kind of new battery would you suggest?

I’ve seen a few videos with fires and I don’t any at my place but I definitely don’t want my son to get hurt or anyone else.

 

[saneagle]

@saneagle I have no idea what are you talking about I’m not a sparky

all photos I posted so far is the stock components fitted by manufacturer

not sure what you mean by:
1. 10 amps from a 4Ah battery is a lot. It might be able to go as high as 15 amps. If you try that, you need to proceed with caution. I always proceed with caution however how can I try (achieve) 15amps?
2.My advice would be not to go higher than 15 amps

I honestly have no idea how to increase amps

the new controller is 36v500w (picture attached) I mentioned it in the post as the auction is for a few types

Are you saying that replacing the controller won’t make a difference?

What kind of new battery would you suggest?

I’ve seen a few videos with fires and I don’t any at my place but I definitely don’t want my son to get hurt or anyone else.

The label on the controller doesn't mention amps. That's very unusual because its primary function is to regulate current. The 500w written on it doesn't mean anything. If it's the rated power, it would be rated at approximately 20 amps since power = volts x amps, so 24V x 20A = 480w, but the maximum allowed current is normally double the rated current; however, there's no way that that controller can deal with 40 amps without exploding. I'd guess that it's a 20A controller, but the only way to know is to measure it with a wattmeter from Ebay.

You shouldn't use that controller with your present battery. It's probable rather than possible that it would explode if you try and run it at 20 amps.

When you buy a battery for an ebike, it would tell you in its listing the maximum continuous current it can give. It's also normally written on the label. Yours has neither, but at only 4Ah it has to be in 7S2P configuration, which means that each cell has to provide half the current. At the moment, that's 5 amps each, which is relatively high for cheap cells, but maybe it has the best cells that can handle more. We have no idea which ones they are. When you take too much current from cells, you see the voltage drop and they start to heat up. When the heat becomes too high, the cells expode and flare off like fireworks.

If you don't understand what I'm telling you, you shouldn't be messing with this stuff. It really is a matter of life and death when it comes to Ebike fires.

 

[soundwave]

 

[adamsowy]

@saneagle it’s not like it’s doesn’t make sense at all, I was just confused how you wanted me to run on 15amps without replacing any of the components .

36V 10S4P 100Ah Battery Pack Electric Scooter E-bike Battery w/ UK Charger | eBay

Battery model: 36V 10S4P. Nominal capacity: 100Ah. Hours Maximum direct current load: 5A. Combination of cells: 4 parallel series 10. As the battery is a custom product, there is an error in the weight and size of the battery.

www.ebay.co.uk

I believe this battery will handle 15amps with 30amps instantaneous maximum discharge

It’s just so frustrating that most of these controllers have zero information about the amps

I have the meter so I’ll check it

@saneagle thank you very much for your time and advising, you made me conscious about things I didn’t even think about it, I was going to just plug the controller with higher amps and not even think about the rest
I had a small search and some people are saying that the 36v500w can even pull 39amps so not ideal for the battery I have

 

[soundwave]

amps!

 

[saneagle]

some people are saying that the 36v500w can even pull 39amps so not ideal for the battery I have

Disastrous rather than not ideal!

 

[adamsowy]

@saneagle what you think about this battery?

or maybe you could suggest other one please

 

[saneagle]

@saneagle what you think about this battery?

or maybe you could suggest other one please

Complete fake - probably recycled cells. cells weigh about 50g each. the description says 40 cells, so it should weigh about 2kg, which is close to the 1.8kg they list it as. Your battery is 4Ah and 24v, so a 36v 100ah one would weigh 37.5 times as much.

Also, it's unclear whether it has a BMS. There's no mention of one in the listing and the picture doesn't show one. Without one, it would make a nice bomb.

It's best to buy one from one of the trusted Chinese resellers, like BMSBattery, Greenbikekit, Topbikekit, PSWPower, or get one from a trusted UK supplier, like Greenlance (my choice), Woosh or Yosepower.

 

[AndyBike]

I'd say if you want him to go faster and enjoy the experience, then get him enrolled on a motocross club.
Bit more of an investment, being a petrol engine, but there at least theres more emphasis on safety gear and a proper helmet.

Im sure he's up to it, but if you really need to do it, then do it correctly, with a capable bike, proper brakes and suitable safety kit.

Chiltern Young Riders, Hertfordshire, UK – Motocross Training

Chiltern Young Riders are a Hertfordshire, UK based motocross training school providing children from the age of four years with off road motorcycle training in a safe and controlled environment.

www.chilternyoungriders.com

 

[Az.]

what you think about this battery?

It is scary. You mention a motorbike, small kid and then post links to batteries like this. My advice is: don't do it.

 

[esuark]

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