The "Editor's Office" forum is more for communicating with the magazine about what they publish, subscriptions, availability, whatever. You'd be better off in the Keyboard Corner. Use an internet search engine first in case your info has already been asked and answered. Something like (without the quotes)
"hammond xk1 battery replacement site:forums.musicplayer.com"
That will search all of these forums, but the only place the results will likely be are this thread and anywhere on Keyboard Corner.