Current consumer friendly rack battery LFP prices are at around 400 EUR/kWh, here an example of a 5.12 kWh for 2100 EUR: https://www.europe.sokbattery.com/prod

Current consumer friendly rack battery LFP prices are at around 400 EUR/kWh, here an example of a 5.12 kWh for 2100 EUR: https://www.europe.sokbattery.com/product-page/sok-battery-100ah-48v-server-rack-battery https://www.europe.sokbattery.com/product-page/sok-battery-1... These are rated for 6000 cycles to 80% degration, so if we take an average of 90% assuming linear degration we will be able to output 6000 by 0.9 so 5400 kWh for each kWh of battery capacity before the battery reaches 80% of its original capacity. 400 EUR divided by 5400 is 0.074 EUR per kWh out the the battery, an order of magnitude lower than the 0.80 EUR per kWh you quoted. These have low self discharge but capacity prices (price per kWh stored in the battery) are way too high to do seasonal storage. Note: if you DIY the battery it's half the price: 150-200 EUR/kWh at the cell level currently.