My battery died over the winter as well since I hadn't driven the car in months and didn't have it hooked up to a battery tender even though I have one (doh!). Anyways, it was a nice excuse to replace the battery with an Antigravity H7 60Ah battery which weighs about 40lbs less than the OEM battery:
https://antigravitybatteries.com/pro...otive/ag-h7-rs