On Wed, 27 Nov 2013 11:34:40 -0600, Nightcrawler® wrote:

As long as the voltage is correct, and the form factor fits where you
want to put it, that is your primary concern. Amp-hour rating should
be spec or larger. Terminals are not really an issue.

This is all good information.
I will order a battery, and a new battery-protection board, which,
I'm pretty sure, should solve the remaining problems.