Hitting a lot of dead ends. Has anyone tried using an Antigravity ATZ-7? I am in the United States and the only direct lithium replacement I've found are either the stock Eliiy HY110, a Morobatt MPLX6.0-HP or a Shido LTZ8V Unfortunately, the last two, affordable options, are not currently available. The Antigravity battery looks to be just slightly too long, but maybe it will fit. Let me know if you have experience using this battery with your AT 1100 or can recommend another readily available lithium battery. Thank you so much!!!