Bought this battery in January of this year. Now it is November and the battery, when the car is idle for a day, drops the voltage to 11.9-11.8. A month ago, before the cold season, I charged it from a stationary charging station (it is supposed to charge it several times a year). Now it's -4 outside and it already shows 11.9. And when will the frosts be stronger? This battery is not worth the money I bought it for.