Uh oh. A week at fifteen volts may have been the key to the coffin.  When a battery overcharges, the electrolyte is converted to gas, specifically hydrogen. In flooded lead acid batteries, one expects some loss, and simply adds distilled/purified water. In our sealed batteries, keeping the charge below the gassing level prevents the loss, generally speaking.

I don't know any way to determine for certain that you've lost electrolyte to gassing, but a week of overcharge would have me very concerned.

The CycleAnalyst comes in different versions and the one for the Xebra and other EVs is the high-current model, requiring an external shunt.  You can see their site at http://www.ebikes.ca/drainbrain.shtml 

I have a CycleAnalyst in every EV in some form, and in three different revisions of the firmware as well.  Did you see my long dissertation about battery ratings, capacity, depth of discharge and CycleAnalyst monitoring? If not, I'll be happy to elaborate once more. I'm nothing if not verbose.

--- In Xebra_EV@yahoogroups.com, "pastaffo" <pastaffo@...> wrote:
>
>
> I have a PakTrakr on my batteries. I noticed the reduced range after I installed the Delta-Q. It was set to the wrong algorithm and I didn't notice. It was charging the batteries to 15volts for about a week. I've since fixed it, but the range is still down.
> I always charge before it reaches 50%, it did sit for a week when the Chinese charger died...
> Where does one get a CycleAnalyst?
> Thanks
>