12V to 13.8V 10A DC-DC Lead-Acid Battery Charger | Step up DC DC Converter

Charge Your Lead-Acid Battery Faster — Directly from Your 12V Power Source

Whether you're managing a dual-battery RV setup, charging a deep-cycle marine battery underway, or building a solar energy storage system, the Jason Bang 12V to 13.8V 10A Battery Charger delivers consistent, battery-safe charging current at the correct lead-acid voltage — no AC outlet, no bulky charger, no complexity.

At 138W continuous output, this module charges batteries up to 500Ah meaningfully and can maintain anything from a small engine start battery to a large AGM house bank. Mount it permanently in your installation or use it as a portable charging solution — the rugged aluminum-alloy case handles road and marine vibration without complaint.

Key Features

• 13.8V Fixed Output: Matches absorption/float voltage for all standard lead-acid chemistry — prevents overcharge damage and battery sulfation
• 10A / 138W Continuous: Suitable for charging or maintaining batteries from 50Ah to 500Ah capacity
• 8–12V Input: Works on 12V vehicle systems, 24V truck electrical, and solar charge controller outputs
• Compact & Mountable: 74×74×32mm footprint with mounting flanges — installs anywhere in battery compartments, junction boxes, or under seats
• Full Protection: Reverse polarity, short-circuit, overcurrent, and thermal shutdown keep both the module and your battery safe
• High Efficiency ≥93%: Very low heat generation — runs cool even in enclosed installations

Technical Specifications

Typical Use Cases

• 🚐 RV house battery charging — maintain 12V AGM house bank while driving or from solar
• ⛵ Boat underway charging — charge service battery from engine alternator or small solar panel
• ☀️ Off-grid solar storage — regulated 13.8V charge input for lead-acid battery banks
• 🔧 Workshop battery maintainer — keep fleet vehicle batteries topped up between uses
• 🏕️ Overlanding & camping — charge aux battery from starter battery or roof-mounted solar

Note: For LiFePO4 (lithium iron phosphate) batteries, 14.6V is the correct charge voltage. Please see our 14.6V LiFePO4 Charger to avoid cell damage.