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I received notice just today from these guys and it has a discount code: 15% off with "RENN15"

LITHIUM BATTERIES, MICRO-STARTS

Smallest, Lightest, Most Powerful Lithium Motorsports Batteries - the First with Built-In Jump-Starting! Top Rated MICRO-START Jump-Starter Power Supplies

antigravitybatteries.com

This is my next battery when my Optima runs down.

That looks very nice
I will add this to my wish list with my vehicles