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Baintech 12V 40A DC-DC Battery Charger

price: 469final price: 399
Baintech 12V 40A DC-DC Battery Charger Review  |  Q&A  | 

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Baintech Dual Battery Monitor

Baintech Dual Battery Monitor

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Baintech 12V 40A DC-DC Battery Charger, 2 Year Warranty

Product Description

Baintech 12V 40A DC-DC Battery Charger, 2 Year Warranty. New to the Baintech range, the 40A DC-DC 3-stage battery charger for Flooded cell, Lithium and AGM/GEL chemistries. The BTDC40 is a powerful 40A charger within a compact and rugged unit, able to withstand high temperatures (up to 70°C).

The BTDC40 is able to utilize up to 80A charging to the auxiliary battery using our new boost mode (Kit Sold Separately) and 40A when wired with a standard configuration. This is all still acheived in the same extremely compact package (373cm³) while still boasting all the features of a booster battery charger in a weather, dust and vibration resistant package.


  • 3-stage 12V Booster Charger
  • 40A max output (standard wiring) 80A max. with optional kit
  • Selectable output voltages for lithium, sealed lead acid or vented lead acid
  • Over current and temperature protected
  • High efficiency (Typical >96%)
  • Precise under voltage protection (No external isolator required)
  • Remote charge status LED indicator
  • Very low standby current: <3mA
  • Optional start assist and boost charge features increase amperage output to 80A max (kit purchased separately)


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Short Description

Baintech 12V 40A DC-DC Battery Charger, 2 Year Warranty

GTIN (Global Trade Item Number) 9338936003774
Brands Baintech
Product Type 12v 40Amp DC2DC Battery Charger
Model BTDC40
Output Current Rating (Amps) 40.0 Amps
Charging Control Three Stages
DC Output Single
DC Input Voltage 5V to 17V
Selectable Battery Type Flooded cell, Lithium, AGM/GEL
Standby Current <3mA (Very low)
Charger Efficiency 96%
Temperature Setting Low/ Normal/ High (Battery Temperature Sensor Standard)
Output Current Rating 80A max optional kit, 40A max standard wiring
Output System Voltage 12V
Dimensions 162 x 71.5 x 32.2 (L x W x H)
Charge Voltage Float - Gel/AGM (25 degrees)** 14.3V
Maximum Charge Current 40Amps
Input Voltage 11VDC to 16 VDC
Manufacturers Warranty 2 Years
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Product Faqs

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  • Q:What size battery charger do I need for my lead acid battery I have in my camper?

    A good battery charger rule of thumb for charging a lead acid battery, is using a charger with output current (amps) of 10-20% of the battery total stored capacity (Ah).

    So, for example if the battery is 12V 100Ah, the charger need to be minimum of 10A and maximum of 20A.  Often splitting the difference at 15% (so a 12V ~15A charger) is a good option. Happy charging!

  • Q:Hi can you use the 40a dcdc charger on a 100amp battery .

    Hi There,

    Yes you can use the DC DC charger with a 100Ah battery

  • Q:Will this charger charge without the ignition wire attached or is it voltage sensing Like most other chargers?

    Hi There,

    The charger requires the ignition wire to be connected for it to charge.



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