There are a lot of off-the-shelf controllers out there now, see if this helps:
https://www.monsterscooterparts.com/trsc/rec-categories/controllers1

You may end up having to replace the motor as well.

Best of luck!
    Peter

On 10/15/18 12:38 PM, Artur Kubik via EV wrote:
I bought Zap at 2010 from China (Mountain Chan). They sent me e-scooter with 19xLiFePO4 
(40Ah) and witch lead battery charger. Now I know It but a bit too late and cells are dead. 
This e-scooter has 2500W/60V motor, not popular because is it six phase. I bought new 
batteries and try to use it but after seven years staying at garrage the controler is 
broken - I have message like  "current controll sensor error - start power again or 
replace controller". Since year I am looking for spare controller for replace this 
broken one but I can't find it  :(
Dnia 15 października 2018 19:36 Eduardo Kaftanski via EV <ev@lists.evdl.org> napisał(a): Hi list, In one strange turn of events, I am now the owner of a Chinese electric
  scooter. It’s a 72v lithium system with a rear hub motor. As far as I know
  it’s the only one of its kind in the country (Chile) as it was brought as a
  demonstrator for a business that ultimately failed.
It’s sold with a bunch of different names and I’ve found it’s based on a
  generic gas scooter. This one has a Zap vin plate riveted in. It has never
  been registered but I am working of that.
I kind of like driving it, but I would like to hack it and reuse the parts
  to convert a Kawasaki 250 or 300 from gas to ev.
Problem is, I now almost nothing about it. Is there some site or sites
  where I can learn about this Chinese ev setups?
Are hub motors interchangeable? I would need to buy a 17” one for the
  Kawasaki but I would like to reuse all the other parts.
Any info and pointers are welcome! Thanks! --
  Eduardo Kaftanski
   edua...@kdi.cl
   ekaf...@gmail.com
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