bioenno power
reasonable price. life expectancy of 2000 - 3000 charges / 7-10 years. made specifically for marine application. warranty is good and customer service is exceptional. these battery's are built for marine applications with safety in mind, eliminating the possibility of fire. there is a chart on their web page which recommends a specific battery based on your head unit model and gives estimated hours of operation per charge based on your head units power consumption. these batters are high capacity batteries with a long life. also half the weight of SLA battery. you will need to buy the charger initially.
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