We have several BladeZ XTR Street II. The power is very off / on as you are gong it feels like it looses power , what part do i need to order to fix that?

[philpalm]

If you have more than one BladeZ are they the same models and have similar problems? Most likely you are refering to only one of the BladeZ so the simple test would be to switch the batteries and see if it is a battery problem or that particular BladeZ. Caution if it is not the same model it might not use the same battery, and it would be ill advised to put a different voltage or amperage battery in another scooter.

If you have a voltage meter you can check how long it takes for the voltage to drop after usage. As a battery gets older it holds a charge not as long as a new battery.