Currie Ezip 750 questions

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creamsoda08
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Joined: 05/05/2012
Points: 3

Howdy! i just purchased an ezip 750 -
https://www.curriestore.com/product/eZip-E-750/825/
a parts list -
https://www.curriestore.com/parts-accessories/ezip-parts/ezip-scooter/?year=2011&model=EZ-750-RD

Ive tried to find more information about adding another battery. My understanding is that one of two things will happen-
1. add another SLA 12v10a battery, (series/paralel, cant remember), and it will run @ 36v. This will give higher top speed, and better acceleration (also more heat etc)

2. Magic smoke, followed by purchasing a new controller and throttle and batteries, the motor will likely be fine.

As for the sprockets, more teeth = more torque, less teeth = more speed ?

Is it safe to replace the SLA batteries with the lifpo ones i keep reading about? ie will it shorten motor life, controlelr life etc etc or is it like i think, and that it doesnt care what the source is, as long as its 12v10a DC ?

Side note- florida sucks =-( so many crazy laws here about what you can and cant ride/drive etc. Im disabled, and very young, i REALLY dont want to ride a dang old-person scooter..... so this is my solution lol

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LeftieBiker
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Joined: 07/09/2011
Points: 845
Re: Currie Ezip 750 questions

I can't address the controller issue, but if you replace the batteries with LiFePo batteries, you will also need an expensive battery management system (BMS). You can buy it all as an integrated unit, but it isn't cheap.

As for sprockets, it depends which one you mean. With the front sprocket, which is the cheaper one to replace, fewer teeth means more torque and less speed, and vice versa. The problem is that each tooth added or removed has a large effect, so you can only change the front sprocket if you need a fairly big change. With the rear sprocket the more teeth you add, the higher the torque and the lower the speed, and vice versa. Rear sprockets are more expensive, and you often have to either lengthen or shorten the chain, but you can "tune" the drive ratio more finely, because each tooth added or removed makes a much smaller difference.

jthmi
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Joined: 02/12/2010
Points: 38
Re: Currie Ezip 750 questions


1-it's a 24 volt design, not 12
2-if you add a third cell, where's it gonna go
3-overvolting will torch the controller/throttle but the batteries will survive and the motor might
4-what is your goal? Save your money before you start sparks...contact me off list
sales@ampbros.com

__________________

JTH/Amp Brothers Electric Cycles/MI

Warrior
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Joined: 03/06/2016
Points: 13
Re: Currie Ezip 750 questions

Hi there, first post and for some reason the forum will not let me start a new thread!!

Anyway along the lines of the original thread starters enquiry, I have a 60v Dayun scooter, it has a1200w in-hub motor, it is powered by 5 x 12v 20ah SLA batteries which, as you can imagine, means it is very heavy, I would like to change these for LifeP04 or similar to,save some weight which will hopefully increase acceleration a little, and maybe give a little more speed up hills, if I do this do I simply swap like for like battery sizes with the same output etc, or do I also need a new charger, and any other things?

I would also like to try and increase the top speed, it currently runs at 30mph on the flat, but I understand some of these can be tweaked to travel at around 40mph without changing any hardware?? It would be great to have that little bit of extra speed for short periods when required, just to be safe in traffic, I appreciate there will be a trade off in range.

Any advice would be appreciated.

LeftieBiker
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Joined: 07/09/2011
Points: 845
Re: Currie Ezip 750 questions

With new lithium batteries you'd also need a lithium-specific charger and a battery managements system (BMS) to keep the cells in balance and prevent overcharging. You might also need a new controller, and that would be the way to add speed and power - with a controller that can be adjusted.

Warrior
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Joined: 03/06/2016
Points: 13
Re: Currie Ezip 750 questions

Many thanks for the reply, it now seems a new model of my current scooter is on the horizon, with lithium ion batteries and other improvements, and the cost difference roughly equates to what I would spend on modifications, so I'm thinking of taking the easy route and buying one when they are released.

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