Baintech BT-1236-10A Marine DC-DC Battery Charger – 12V Output 10A

Baintech BT-1236-10A delivers professional DC-DC charging for 12V lithium auxiliary batteries in dual battery systems, marine applications and off-grid power setups.

This 10A charger accepts 10-36VDC input from alternators, solar controllers or primary battery banks, converting it to precise 400W output optimized for LiFePO4 and LiMn2O4 chemistry. The waterproof, dust-proof and shockproof marine-grade enclosure withstands engine room heat, salt spray and vibration that destroys standard DC-DC chargers. Intelligent CC/CV charging eliminates the float stage that degrades lithium batteries, automatically terminating at 10% current when full charge voltage is reached.

Designed for Australian marine and 4WD environments where auxiliary lithium batteries replace traditional lead-acid house banks. The wide 10-36VDC input range accepts voltage from 12V and 24V vehicle electrical systems, along with fluctuating alternator output during engine operation. C400L series technology achieves 96% efficiency, minimizing heat generation in confined battery compartments while maximizing charge current delivery during short engine run times.

Key Specifications

• Rated output: 12V DC, 10A (400W)
• Input voltage range: 10-36VDC (multi-voltage compatibility)
• Battery chemistry: LiFePO4 and LiMn2O4 lithium batteries
• Charging profile: CC/CV (Constant Current/Constant Voltage)
• CC cutoff voltage: 14.6V (LiFePO4), 12.6V (LiMn2O4 3-series)
• Charging efficiency: Up to 96%
• Environmental protection: Waterproof, dust-proof, shockproof (marine grade)
• Safety certifications: CE, RoHS, ISO9001-2015
• Protection features: Over-voltage, over-temperature, over-current, short circuit

Features & Benefits

Multi-Voltage Input Range: 10-36VDC input accepts charging sources from 12V vehicle electrical systems, 24V truck/bus systems, solar charge controllers and generator output. Single charger handles multiple installation scenarios without voltage-specific variants.

Lithium-Specific Charging Algorithm: Delivers precise 14.6V cutoff for LiFePO4 or 12.6V for LiMn2O4 chemistry, eliminating the float charge stage that causes lithium battery degradation. Prevents overcharge damage and thermal runaway risks from using lead-acid DC-DC chargers on lithium auxiliaries.

Marine-Grade Environmental Protection: Waterproof, dust-proof and shockproof construction withstands engine room spray, bilge water exposure and constant vibration. Operates reliably in conditions that cause standard DC-DC chargers to fail within months.

High-Efficiency Conversion: 96% efficiency reduces wasted power and heat generation during charging. Critical for confined engine rooms and battery boxes where heat buildup degrades both charger and battery performance.

Intelligent Charge Termination: Automatically reduces charge current to 10% upon reaching full charge voltage, then terminates without float charging. Maximizes lithium battery cycle life by preventing the continuous low-level charging that shortens lithium cell lifespan.

Alternator-Friendly Operation: Draws charging current progressively as alternator output stabilizes, preventing voltage sag and alternator overload during engine startup. Protects vehicle electrical systems while maximizing charge delivery during engine run time.

Technical Specs

• Model: BT-1236-10A
• Series: C400L
• Rated output voltage: 12V DC
• Rated output current: 10A
• Maximum output power: 400W
• Input voltage range: 10-36VDC
• Battery chemistry compatibility: LiFePO4, LiMn2O4
• Charging method: CC/CV (Constant Current/Constant Voltage)
• CC cutoff voltage (LiFePO4): 14.6V
• CC cutoff voltage (LiMn2O4 3-series): 12.6V
• Charge termination: 10% current reduction at full voltage
• Float charging: None (lithium-optimized)
• Conversion efficiency: Up to 96%
• Technology: Advanced switching mode power supply
• Environmental protection: Waterproof, dust-proof, shockproof
• Over-voltage protection: Yes
• Over-temperature protection: Yes
• Over-current protection: Yes (CC mode)
• Short circuit protection: Yes
• Output terminal type: Universal battery system compatibility
• Certifications: CE, RoHS, ISO9001-2015

Compatible With / Goes Well With

• 12V LiFePO4 auxiliary battery systems (50Ah-200Ah typical range)
• 12V LiMn2O4 lithium house banks (marine applications)
• Dual battery systems (vehicle primary to lithium auxiliary)
• Marine electrical systems with lithium house banks
• 4WD and caravan lithium battery upgrades
• Solar charge controller integration (10-36VDC output)
• 24V truck/bus systems charging 12V auxiliary batteries
• Off-grid power systems with mixed voltage sources

Caution: Output is 12V only. This charger cannot charge 24V or 36V auxiliary battery systems. Verify your auxiliary battery voltage before connection.

Frequently Asked Questions

Can this charge from a 12V alternator while the engine is running?

Yes, the 10-36VDC input range accepts 12V alternator output (typically 13.5-14.5V during operation). The charger intelligently regulates current draw to avoid overloading the alternator while maximizing charge delivery to the auxiliary battery.

Will this work in a 24V truck dual battery system?

Yes, the 10-36VDC input range covers 24V vehicle electrical systems (typically 27-28V during alternator charging). The charger outputs regulated 12V to charge a 12V auxiliary lithium battery from the 24V primary system.

Is this suitable for below-deck marine installations?

Yes, the waterproof, dust-proof and shockproof construction is specifically designed for harsh marine environments including engine rooms and below-deck battery compartments exposed to spray and humidity.

What happens if I accidentally connect this to a lead-acid auxiliary battery?

The charger will attempt to charge lead-acid batteries but will not provide correct voltage profiles. LiFePO4 setting (14.6V) may undercharge flooded lead-acid (requires 14.4-14.8V with float). Use lithium-specific chargers only with lithium batteries.

How long does it take to charge a 100Ah lithium auxiliary battery?

Approximately 10-12 hours from empty with the 10A output, accounting for charging efficiency and the CV taper phase. Actual time varies with battery capacity, depth of discharge and input voltage stability.