Battery Tender® 3-Bank Selectable 12V or 6V, 9 AMP Battery Charger

Three battery banks. Three independent ISM charging circuits. The Battery Tender® WaveCharge 3-Bank delivers simultaneous independent charging at 3 Amps per bank to boats and vehicles running a starting battery, a house battery bank, and a dedicated electronics, trolling motor, or auxiliary battery — each maintained with the correct chemistry profile and charge stage without interference from the others.

Three-Bank Charging for Marine and Automotive Applications

Larger powerboats, cruising sailboats, overlanding vehicles, and custom builds with dedicated accessory battery systems routinely run three separate 12V battery banks with different usage patterns and charge requirements. The WaveCharge 3-Bank runs three completely independent ISM cycles at full 3 Amps output per bank — three batteries charging at their own rate, in their own stage, with their own chemistry profile, simultaneously.

Independent Banks at Full Output

No bank shares output with another. Each of the three banks runs its own complete 3 Amp ISM circuit independently. A bank recovering a depleted trolling motor or auxiliary battery at full 3 Amps bulk charge does not reduce output available to the bank holding a fully charged starting battery in float maintenance. All three banks operate at full capacity simultaneously.

Multi-Chemistry: Lead-Acid and Lithium Per Bank

Each bank has its own chemistry selector — lead-acid or Lithium (LiFePO4). A boat or vehicle running a lead-acid starting battery, a lead-acid house bank, and a Lithium auxiliary battery can configure each bank independently for the correct charging profile. Full 3 Amps output at the correct chemistry and maintenance protocol on all three banks simultaneously.

ISM: 4-Stage Charging on Each of Three Banks

• Initialization — Individual health check before current flows on each bank
• Bulk Charge — Full 3 Amps output per bank restores depleted capacity independently
• Absorption — Current tapers per bank as each battery approaches full charge
• Float Maintenance — Correct protocol for lead-acid or Lithium on each bank, 24/7, indefinitely

Compatible per bank: 14Ah to 100Ah at 12V. Lead-acid: flooded, AGM, gel cell, sealed MF. Lithium: LiFePO4.

IP67 Marine and Weatherproof Construction

IP67 certified for complete dust protection and water immersion resistance to 1 meter for 30 minutes. Designed for permanent installation in engine compartments, battery bays, and below-deck or under-vehicle locations where moisture exposure is routine.

Applications

• Boats with three-bank electrical systems
• Trucks, SUVs, and overlanding vehicles with starting, house, and auxiliary battery banks
• Camper vans and custom builds with three independent battery circuits
• RVs and campers with separate starting, house, and chassis battery banks
• Any three-bank 12V application with mixed or matched battery chemistries

Automatic Temperature Compensation

Each bank adjusts charge voltage automatically based on ambient temperature for lead-acid applications — ensuring correct charging across all three banks in any environment.

Safety Features

• Spark-proof connection on each bank
• Reverse polarity protection per bank
• Short-circuit protection per bank
• IP67 sealed housing

2-Year Limited Warranty | DeLand, Florida Since 1965