I use the tenders to charge the batteries 2 or 3 times over the winter. All the restoration style batteries I have bought tells you in the paperwork to not use battery tenders. As far as fuel I rarely use any stabil type additive but I do try to make sure they have aviation fuel in them before I store them. They say it keeps forever unlike pump gas, standard pump gas kills my accelerator pumps not to mention it looses it strength over time.
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