if you compare the yuasa ytz7s and antigravity atz7 specs, some apparent differences might help you decide. the yuasa ytz7s is an agm battery known for reliability and resilience in high performance situations. it has a steady output and works well for riders who prefer minimal maintenance. on the other hand the antigravity atz7 has a lithium battery which is much lighter and offers faster starting power. lithium batteries also have lower self discharge rates making them a good choice if your yfz450r sits idle for weeks.
the draining issue you mentioned could be solved with a lithium battery like the Antigravity since it handles storage better. but due to their durability agm batteries like yuasa can last longer in more rugged conditions. if youre looking for something lightweight and efficient the atz7 might be a great fit. for heavy duty reliability the ytz7s could serve you better. either way check the recommended cold cranking amps and dimensions for your model to avoid compatibility issues. let me know what you decide. happy riding!