proper way to charge lepton with the evercell baTTERIES

Very familiar with the Evercel Nickel-Zinc been using them for over 8 years ,.
Should use CC and CV temperature monitoring is mandatory ! .
Before starting , check that the cells capacity are close ( less 3% variations) and they are in the same charge condition
If the cells capacity are not close , will end up overcharging some cells , damaging them . further reducing their capacity .
The Nickel-Zinc cells are very good overall chemistries for traction application ( car , scooter , wheelchair etc) however they require close attention to charging .They presently being used in a......... Electrum Spyder ............. www.universalelectricvehicle.com ,also have heard that they are in use in a electric TaxiCab , due to they ability to be quickly recharged , less than 30 minutes with the proper temperature and heat management .
Have a number of good 24 volt 30 amp Evercel pack for the Lepton scooter that are meeting the original manufacture specification .
I can be reached at (203)627-8426
Regards
Andre

Here is some basic info that I was able to find on the net but have no actual experience myself.

Nickel Zinc Battery Charging

Basics
Nickel zinc batteries tend to want to be charged at high rates. For example they can be charged at C/2 for 2.5 hours. This indicates a charge efficiency of 80% at this charge rate. After charging at C/2 for 2.5 hours a 5 minute rest is included in the algorithm. The voltage is then set at 2.05 volts per cell, allowing the current to taper, and thus top off the battery.

The termination voltage is a strong function of temperature. It is possible to eliminate the top-off portion of the charge, since it only adds about 5% to the total capacity. Undercharging will not damage this battery.

Fast Charging
The Ni-Zn batteries can be charged in as little as 2.5 hours at a charge rate of C/2. But
cells temperature must be checked out when higher currents are being applied. Fast
charging may be applied up to a 95% SOC. Final 5% is achieved by a C/4 rate after a five
minute rest. Complete fast charge is expected to last less than three hours.

Various sources reported the cutoff voltage at about 1.94V/cell at C/2 then a 5 minute rest or until voltage falls below 1.78V/cell then a constant voltage charge at 2.05V/cell until current drops off.

I bought an Oxygen Lepton in March. The seller (Electric Motor Sport) warned me that I would need to break in and maintain the Evercell batteries with regular usage, initially draining them as much as possible.

Unfortunately, my actual usage pattern has not been what I anticipated (due to a number of life changes). So now my poor Lepton sometimes sits in the garage for weeks at a time before I get to try and "break it in"... so I have yet to ride more than a half mile before running out of juice.

Is there some charger I can purchase that will break in and maintain these NiZn batteries?

Hey gerwitz, long time no hear. You still in the STL?

Recomend that you check the impedance of each cells ( normally they should be between when charged 1-1/2 - 3 milliohms to 4-6 milliohms in discharged state) before doing any charging cycle .
The 48 volt pack is arround 50-80 milliohms when charged up
I am interested in the figures and may be able to get your scooter going again e-mail the figures.
Is it safe to assume that the internal charger in the scooter is functional ?.