Battery Headed South for Winter

[Greg Johnson <gregsj@iea.com>]

Fellow Audians;

The battery in my '91 200-20v tqa is heading south for the
winter. Any BTDT with Optima batteries? If so, which model should
I be getting and what should I expect to pay for it?

Ned Ritchie mentioned Blue something or others a while back
(canadian company started by folks who left Optima)  Any BTDTs
with this company?

TIA for your collective help and wisdom.  If you subscribe to
multiple lists, please forgive the multiple mail.

GregJ