The NAPA Legend Premium BAT842575 is a marine-grade AGM deep-cycle battery designed for demanding applications like boats and RVs. Using absorbed glass mat (AGM) technology, it provides spill-proof construction and deep discharge recovery ideal for trolling motors and off-grid power systems. With a typical 12V configuration and 100–120Ah capacity, it offers 800+ cycles at 50% depth of discharge. Pro Tip: These batteries excel in vibration-prone environments due to their high-density plate stacks.
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What distinguishes the BAT842575 from standard marine batteries?
The BAT842575 uses AGM technology for maintenance-free operation and deep-cycle endurance. Unlike flooded batteries, its sealed design prevents acid leaks during rough waters. With 30% faster recharge rates and 3× longer cycle life compared to conventional marine batteries, it withstands constant charge/discharge cycles common in maritime use.
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Technically, the BAT842575 employs lead-calcium grids that reduce gassing and water loss. Its compression ratio exceeds 20 kPa—crucial for resisting plate shedding during high-current draws. For example, powering a 60lb thrust trolling motor for 5+ hours requires this structural integrity. Transitioning to real-world benefits, boaters appreciate its 2-year shelf life when stored at 50% charge. But how does this compare to lithium alternatives? While lithium batteries offer lighter weight, the BAT842575’s -40°C to 60°C operating range suits extreme climates better. Warning: Never charge AGM batteries above 14.8V—use temperature-compensated chargers to prevent overvoltage damage.
What are the maintenance requirements for this battery?
NAPA’s AGM design eliminates electrolyte refilling and terminal corrosion concerns. The recombination efficiency exceeds 99%, meaning virtually no water loss. Monthly voltage checks (12.6V+ at rest) and annual load testing suffice for maintenance.
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| Parameter | BAT842575 | Flooded Equivalent |
|---|---|---|
| Water Refills | 0 | 4–6/year |
| Self-Discharge | 3%/month | 5–8%/month |
| Terminal Cleaning | Biannual | Quarterly |
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FAQs
Yes, AGM batteries function in any orientation except inverted—ideal for tight marine engine compartments.
What’s the warranty period?
Typically 36 months with proper registration, but validate through NAPA’s warranty portal post-purchase.
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