Update: Deal over. We’ve seen a handful of deals lately on your favorite rechargeable batteries, but if you haven’t begun collecting them yet, the Eneloop Power Pack is the best place to start.

Amazon has the whole box for $31 today, which is an all-time low, and to add more urgency, the Power Pack in notorious for selling out almost immediately.

Inside, you’ll find eight AAs, two AAAs, two C spacers, two D spacers, and a charger. Plus, you can feel like a good steward of the planet knowing that they were all pre-charged in Japan using renewable solar power, and can be reused for 2100 cycles. That’s about as eco-friendly as batteries get.

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