E-bikes newbie question

Hello guys I am newbie to E-bike and I have bought a greenbike HP-004 for 1364$ which is expensive a lot over here.
http://www.greenbike.biz/Mountaintop.html
and the max speed is 25 kmp or 15.5 mph which is not satisfying at all .
So I want to speed it up, I am not really good with good with electronics but I am willing to learn.
I have missed a little with the bike and these are the parts I have in it.
here are all the pictures:
http://imgur.com/a/y0AuB#0
I have 250w 36v motor, 36v 10AH, hand accelerator, pedals accelerator.
samsung IRC18650-26F 40 Battries.
I have the following questions:
If I increase the battery to 48v 10AH will the motor be faster ?
If I increase the battery to 36v 20AH will the motor be faster ?
If I change the brushless DC. Motor controller to this one:
http://www.aliexpress.com/item/Motor-Brush-Speed-Controller-for-Electric-Bike-Bicycle-Scooter-36V-500W/1395902903.html
using the same 36v 10ah battery will the motor be faster ?
excuse me for my bad English and if you know any tips to increase the speed please let me know I really want to learn.

I am by no means an expert but I am pretty sure the answer to all your questions is NO.

In order to make the bike go faster, you must increase the voltage to the motor. You do this by having a battery with more voltage AND a controller with more voltage. Only changing one thing or the other isn't going to give you more speed.

You cannot increase the battery without damaging the existing system. You MAY be able to change the controller and use a 36V battery but I suspect there is not much to gain. You bought a 15MPH bike. Without a motor capable of higher voltages, it is what it is. Enjoy it. It looks like a nice bike. Or if possible sell it and use your skills and this forum to build a faster bike..

Hang on you'll get even more opinions.

Pinesal said:

I am by no means an expert but I am pretty sure the answer to all your questions is NO.

In order to make the bike go faster, you must increase the voltage to the motor. You do this by having a battery with more voltage AND a controller with more voltage. Only changing one thing or the other isn't going to give you more speed.

Click to expand...

tomjasz said:

You cannot increase the battery without damaging the existing system. You MAY be able to change the controller and use a 36V battery but I suspect there is not much to gain. You bought a 15MPH bike. Without a motor capable of higher voltages, it is what it is. Enjoy it. It looks like a nice bike. Or if possible sell it and use your skills and this forum to build a faster bike..

Hang on you'll get even more opinions.

Click to expand...

thank you guys, so if I add more 16 Samsung IRC18650-26F batteries into the current 36v 10 AH it will be 48V 10AH, and if i replace the current controller with this one http://www.aliexpress.com/item/Motor-Brush-Speed-Controller-for-Electric-Bike-Bicycle-Scooter-36V-500W/1395902903.html it will be faster ? and how much faster ?
and the serious problem here is they don't sell e-bike parts I have to buy it from China and the shipping is so expensive and it takes a month or so to arrive, for example this:
http://www.aliexpress.com/item/new-wholesale-bafang-8fun-36V500W-CST-motor/2000451217.html 500w 36v motor costs 200$ and the shipping 70$ and it does not even come in wheel,

Get a bigger motor. A motor to match the voltage of the battery. You are going to burn up the existing motor. You bought a 15MPH motor. It will no run at 25. If it does it will be a rather short ride.

Welcome to the forum. Your bike is near the limits of what it was designed for. However, there is likely an electronic governor of some kind that limits the speed to 25kph. Some controllers do it internally, others have a bypass that can be used to increase the speed a little. Check your controller for a white wire. If it has a single white wire, with a single connector plugged into another white wire that returns to the controller, then simply unplugging the connector removes the speed limit, and you may gain a little more speed.


The 250w motor can't handle much more power, and the battery likely can't handle putting out much more amperage needed for more speed, so if the wire trick isn't enough, you will need a new motor, controller, and battery to get much more speed and power.

tomjasz said:

Get a bigger motor. A motor to match the voltage of the battery. You are going to burn up the existing motor. You bought a 15MPH motor. It will no run at 25. If it does it will be a rather short ride.

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Drunkskunk said:

Welcome to the forum. Your bike is near the limits of what it was designed for. However, there is likely an electronic governor of some kind that limits the speed to 25kph. Some controllers do it internally, others have a bypass that can be used to increase the speed a little. Check your controller for a white wire. If it has a single white wire, with a single connector plugged into another white wire that returns to the controller, then simply unplugging the connector removes the speed limit, and you may gain a little more speed.


The 250w motor can't handle much more power, and the battery likely can't handle putting out much more amperage needed for more speed, so if the wire trick isn't enough, you will need a new motor, controller, and battery to get much more speed and power.

Click to expand...

So if I use 36V 10AH Battery with 500w controller and 500W motor the bike will be faster ?
and what does increase the motor speed the voltage or the amperage or both ?

bahaa.zahika said:

So if I use 36V 10AH Battery with 500w controller and 500W motor the bike will be faster ?
and what does increase the motor speed the voltage or the amperage or both ?

Click to expand...

Best to think in terms of watts - power. Watts = voltage * amperage. You can get more power by increasing either V or A. More volts by increasing the battery. More amps by upgrading the controller, which by definition are amperage control devices. Motors are rated for maximum watts for a reason - they will over-heat and destruct if you deliver more. Nonetheless, most motors can handle more than they are rated for. Same for controllers, a maximum amperage. But its best to get a matched set of motor, controller and battery, which is the way most eBikes are made, whether as a production or DIYer hobbyist.

Drunkskunk said:

Welcome to the forum. Your bike is near the limits of what it was designed for. However, there is likely an electronic governor of some kind that limits the speed to 25kph. Some controllers do it internally, others have a bypass that can be used to increase the speed a little. Check your controller for a white wire. If it has a single white wire, with a single connector plugged into another white wire that returns to the controller, then simply unplugging the connector removes the speed limit, and you may gain a little more speed.


The 250w motor can't handle much more power, and the battery likely can't handle putting out much more amperage needed for more speed, so if the wire trick isn't enough, you will need a new motor, controller, and battery to get much more speed and power.

Click to expand...

No white wires.

arkmundi said:

bahaa.zahika said:

So if I use 36V 10AH Battery with 500w controller and 500W motor the bike will be faster ?
and what does increase the motor speed the voltage or the amperage or both ?

Click to expand...

Best to think in terms of watts - power. Watts = voltage * amperage. You can get more power by increasing either V or A. More volts by increasing the battery. More amps by upgrading the controller, which by definition are amperage control devices. Motors are rated for maximum watts for a reason - they will over-heat and destruct if you deliver more. Nonetheless, most motors can handle more than they are rated for. Same for controllers, a maximum amperage. But its best to get a matched set of motor, controller and battery, which is the way most eBikes are made, whether as a production or DIYer hobbyist.

Click to expand...

thanks bro, do you know any good website that ships worldwide for 500w kit or more ? it will be great if the shipping is not expensive.
as far as i understand from you is the battery amperage only affects the range of the trip ?

bahaa.zahika said:

thanks bro, do you know any good website that ships worldwide for 500w kit or more ? it will be great if the shipping is not expensive.
as far as i understand from you is the battery amperage only affects the range of the trip ?

Click to expand...

I list a lot of good kits in my Top 10 eBike Conversion Kits & Where to Buy thread. The usual metric for battery range is amp-hours. You may also see watt-hours or kwh, a thousand of those. Latter is how electricity is metered. Note that the upgraded MAC 8T (which I use) could be run at 30 amp or 40 amps, depending on the controller you get. If at 40, you'd have more speed but less range, one third less. So these decisions matter. It depends on your individual needs & riding style. I run at 48 volts and 40 amps and have a great battery that can deliver the juice. That's about 2000 watts of power. Hence I need 1 kwh for every half hour of run time at full throttle.

.. after skype chat, I've concluded that your approach is doomed. You're getting various components from different companies because you think you can save a few bucks. Worse, they're not well matched components with regards to watts, volts and amps. You won't be saving any money in the long-run and risk blowing your investment completely trying. Go to http://em3ev.com/store/ and get a kit from them that includes everything. Buy what you can afford and no more. One vendor, one shipment. Done. Try to recoup your investment in sh*t from china through eBay or forum-for sell ad. For instance
Upgrade Mac Kit with 36V Frame Battery (up to 40km/h/25mph)

The combination of controller, battery and motor have been selected to ensure all parts are suitably matched and working within the recommended limits.

Click to expand...

That's a great starter package including everything, motor, controller, battery, charger, frame pack, laced into an Alexrim with Sapim spokes. Since its the upgraded Mac, it can latter be made more powerful when the money allows, by getting a higher amp controller and a 48V battery. Guaranteed to work, quality components, no fuss. Whatever, good luck!

I think that there's loads you could do with that bike to get more speed. The controller looks identical to the BMSBattery S06S or S06P. They have a programmable speed limit that you access through the LCD, but yours has the LED panel, so you can't gain access. I think you have 5 wires to the LED panel, in which case you could upgrade to a LCD to access all the programmable parameters. This one should do it:

http://www.aliexpress.com/store/product/KT-LCD2-B-DISPLAY-METER/914437_690420815.html

Until the speed limit is released, it's difficult to say how fast it will go. Most of the SWXH motors I tried were good for about 20 mph at 36v.

The controller will handle another two cell-groups to take you ip to 12S (44v), which will give you 20% more speed and 20% more torque. Some people have wired in a 2S lipo pack as a booster battery or made one out of those Samsung cells. If you do that, you need to manage the booster battery carefully with a voltmeter because it won't have a BMS. If you go up to 13S, you'll get 30% more, but you need the 48v version of the controller:

http://www.aliexpress.com/store/product/Regeneration-Electric-Bicycle-Brush-less-Controller-48V-6-MOSFET/914437_1749495210.html

arkmundi said:

.. after skype chat, I've concluded that your approach is doomed. You're getting various components from different companies because you think you can save a few bucks. Worse, they're not well matched components with regards to watts, volts and amps. You won't be saving any money in the long-run and risk blowing your investment completely trying. Go to and get a kit from them that includes everything. Buy what you can afford and no msore. One vendor, one shipment. Done. Try to recoup your investment in sh*t from china through eBay or forum-for sell ad. For instance
That's a great starter package including everything, motor, controller, battery, charger, frame pack, laced into an Alexrim with Sapim spokes. Since its the upgraded Mac, it can be latter be made more powerful when the money allows, by getting a higher amp controller and a 48V battery. Guaranteed to work, quality components, no fuss. Whatever, good luck!

Click to expand...

Best advise. I so hate cobbled up messes. These failure are what give ebikes a bad name. I'm so glad my first kits were plug and play. Now as I experiment and learn I am still certain to have a reliable ride.

tomjasz said:

arkmundi said:

.. after skype chat, I've concluded that your approach is doomed. You're getting various components from different companies because you think you can save a few bucks. Worse, they're not well matched components with regards to watts, volts and amps. You won't be saving any money in the long-run and risk blowing your investment completely trying. Go to and get a kit from them that includes everything. Buy what you can afford and no msore. One vendor, one shipment. Done. Try to recoup your investment in sh*t from china through eBay or forum-for sell ad. For instance
That's a great starter package including everything, motor, controller, battery, charger, frame pack, laced into an Alexrim with Sapim spokes. Since its the upgraded Mac, it can be latter be made more powerful when the money allows, by getting a higher amp controller and a 48V battery. Guaranteed to work, quality components, no fuss. Whatever, good luck!

Click to expand...

Best advise. I so hate cobbled up messes. These failure are what give ebikes a bad name. I'm so glad my first kits were plug and play. Now as I experiment and learn I am still certain to have a reliable ride.

Click to expand...

I'm not sure what you're saying there. You gave a quote that says not to experiment, yet you said that you're pleased you experimented to get a nice ride. Personally, I don't agree with the quote at all. People learn a lot by hacking and experimenting, then they can pass on the knowledge so that others can benefit. If it weren't for that, this forum would be a very boring place.

For OP, changing his LED display to a LCD one won't result in a cobbled mess because it's designed spefically for his controller by the same manufacturer. It should be as simple as unplugging the LED one and plugging in the LCD. It should at least allow him to release the speed limit, which might be all he needs, and at the same time it will give him extra functions to experiment with.

Your small controller can be easily modified to feed much higher power, and can take higher voltage to attain higher speed. Yet, that is the only component of your system that can handle better performance. The motor is too small and the battery can't feed much more power, so they will fail soon if you succeed upgrading the controller to increase performance. That is the common problem with ugrading most commercial ebikes.

That is why most of us prefer to build our own. Upgrading yours will require fitting a more poweful kit, not difficult to do but extra money to spend.

First target your requirements. What speed you want to achieve, how much more acceleration you want to have and how far you want to go. Then we can suggest the appropriate components for your upgrade.

tomjasz said:

arkmundi said:

.. after skype chat, I've concluded that your approach is doomed. You're getting various components from different companies because you think you can save a few bucks. Worse, they're not well matched components with regards to watts, volts and amps. You won't be saving any money in the long-run and risk blowing your investment completely trying. Go to and get a kit from them that includes everything. Buy what you can afford and no msore. One vendor, one shipment. Done. Try to recoup your investment in sh*t from china through eBay or forum-for sell ad. For instance
That's a great starter package including everything, motor, controller, battery, charger, frame pack, laced into an Alexrim with Sapim spokes. Since its the upgraded Mac, it can be latter be made more powerful when the money allows, by getting a higher amp controller and a 48V battery. Guaranteed to work, quality components, no fuss. Whatever, good luck!

Click to expand...

Best advise. I so hate cobbled up messes. These failure are what give ebikes a bad name. I'm so glad my first kits were plug and play. Now as I experiment and learn I am still certain to have a reliable ride.

Click to expand...

I'll will give it a try anyway and if i feel any extra heat coming from the motor ill try to buy a new one.

I have bought these things:

http://www.aliexpress.com/item/Freeshipping-Battery-Balance-Charger-Original-IMAX-B6-Lipo-Digital-Balance-Charger-Charging-adapter-Wholesale/999931259.html
http://www.aliexpress.com/item/Newest-Original-Imax-B6-Balancer-Charger-12V-5A-Power-Adapter-supply-adaptor-Good-quality-With-Free/1265976224.html
http://www.aliexpress.com/item/DMM-Digital-Multimeter-A830L-Ammeter-Multitester-Voltmeter-Megohmmeter-Ohmmeter-hFE-Current-Tester-w-LCD-Backlight/32268733259.html
to test the batteries that i have bought .
I have bought 2 lots of this: http://www.aliexpress.com/item/10pcs-lot-Original-Samsung-18650-ICR18650-26F-2600mAh-Li-ion-3-7v-Battery-Free-Shipping/32310978289.html
and I have bought this controller http://www.aliexpress.com/item/Motor-Brush-Speed-Controller-for-Electric-Bike-Bicycle-Scooter-36V-500W/1395902903.html
can any one tell me if it will make my motor smoke or not ?
and I have bought 1 lot of these batteries which i doubt that they are real: http://www.aliexpress.com/item/Free-shipping-2pcs-lot-18650-rechargeable-batteries-3-7v-5800-mAh-Lithium-li-ion-battery-for/32243013002.html
and I have bought the display which d8veh recommended.

now to make my battery 48v i only have to add more 9 batteries to my current 40 Samsung batteries, but I wont be able to charge them with my current charger.
I have found this charger: http://www.aliexpress.com/item/E-Bike-Lithium-battery-48V-charger-54-6V-2Amp-13S-battery-charger-High-Quality-with-Aluminum/947120467.html?spm=2114.32010308.4.2.CjoA2S
do anyone recommend it to me ?
I am doing this in sake of experimenting and learning, if I fall maybe ill buy a new ready kit

MadRhino said:

Your small controller can be easily modified to feed much higher power, and can take higher voltage to attain higher speed. Yet, that is the only component of your system that can handle better performance. The motor is too small and the battery can't feed much more power, so they will fail soon if you succeed upgrading the controller to increase performance. That is the common problem with ugrading most commercial ebikes.

That is why most of us prefer to build our own. Upgrading yours will require fitting a more poweful kit, not difficult to do but extra money to spend.

First target your requirements. What speed you want to achieve, how much more acceleration you want to have and how far you want to go. Then we can suggest the appropriate components for your upgrade.

Click to expand...

How could I modifie the controller ? if you want a picture with the controller opened ill take one for you, for now i want to go faster than 15mph with the current motor something like 19 mph.
and I would like to reach 24 mph to 31 mph and so in future even if it requires me to buy new things.

The controller is the wrong one. It's for a brushed motor. You have a brushless one. Yoy should get the 48v version of your controller, which I linked to above. Don't worry too much about power ratings at this stage. The one I recommended is well suited to your motor. If you find the 30% gain in speed and power not enough ,there's more you can do to get a bit more.

Forget those Ultrafire batteries. They don't meet the specifications in the listing and can't give enough current. They're for great phone power packs and flashlights.

Be careful when soldering wires to the Samsung cells. Use a hot soldering iron and be quick so that you don't damage them.

d8veh said:

The controller is the wrong one. It's for a brushed motor. You have a brushless one. Yoy should get the 48v version of your controller, which I linked to above. Don't worry too much about power ratings at this stage. The one I recommended is well suited to your motor. If you find the 30% gain in speed and power not enough ,there's more you can do to get a bit more.

Forget those Ultrafire batteries. They don't meet the specifications in the listing and can't give enough current. They're for great phone power packs and flashlights.

Be careful when soldering wires to the Samsung cells. Use a hot soldering iron and be quick so that you don't damage them.

Click to expand...

x.x Thanks brother I have not pay attention, you mean by the hot soldering iron, this ?
http://www.aliexpress.com/item/0-8mm-New-Tin-Lead-Tin-Wire-Melt-Rosin-Core-Solder-Soldering-Wire-Roll-S7NF/1216705230.html?spm=2114.32010308.4.2.QvSvAJ

and which charger do you recommend me to use with 48v 10 ah battery ?

and what is best brush-less motor or brushed motor ?

Where do you live ?

999zip999 said:

Where do you live ?

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EDITED