Pro Batt Ultra Battery to Battery Chargers, Green Label, 2 Year Warranty


Green BB1230/60 (Very Latest) Instructions Version 69+

Blue Stripe 2022 Model Instruction Manual

Product Information PDF

V51 April 2017 onward + OEM lock edition Instructions PDF


V62 September 2017 onward + OEM lock edition Instructions PDF



Pro Batt Ultra This Battery to Battery Charger is Regenerative Braking / Smart Alternator Friendly - ideal for Euro 5 / 6 + engines.

Please read about Regenerative Braking

Regen Compatability.


E marking Certificates for the BB1230 | BB1260 | BB122470

BB1230 E mark certificate


BB1260 E mark certificate

BB122470 E mark certificate



Sterling's range of Battery to Battery Chargers (B2Bs) has grown significantly over the past few years.  This is in an effort to supplement the ever growing demand from the commercial vehicle, recreational vehicle and marine industries.  The B2Bs have become extremely popular as they fast charge batteries as you cruise along without the need for complex wiring, touching your alternator, voiding the alternator's warranty and tampering with the electronic control units (ECUs).  You can provide the onboard batteries with a fast 4 stage charging profile with a very simple and speedy installation.  All of the benefits of advanced charging without any of the drawbacks.  Simply connect the B2B between the battery being charged and the battery you wish to charge. 


DC V (In) DC V (Out) Amps In Weight Kg L x W x D mm Part Number
12 12 30 1.2 190 x 160 x 70


12 24 30 1.2 190 x 160 x 70


12 12 60 1.4 190 x 160 x 95 BB1260
12 24 70 1.4 190 x 160 x 95 BB122470
12 36 70 1.4 190 x 160 x 95 BB123670
12 48 70 1.4 190 x 160 x 95 BB124870
24 24 35 1.4 190 x 160 x 90 BB242435
24 12 35 1.4 190 x 160 x 95 BB241235
Remote Control with 10m cable BBURC



1) Multiple Activation Modes: Automatic for most non vehicle applications,

    Manual for remote activation. 

    Regenerative braking (requiring ignition feed),

    Automatic regenerative braking, requiring no ignition feed.

2) Output charging at 12V, 24V, 36V and 48V.  Input voltages at 12V and 24V, Up to 800W rating.

3) Much larger model up to 3000W coming soon.

4) Current is NOT taken from the input battery and given to the output battery.  The B2B uses alternator power to charge the output battery.  Manual mode and regenerative braking mde allows you to override this.

5) Safety features:

100% fire proof plastic box.

No screws to corrode.

Thermal power reduction.

Multi stage fan cooling

6) Night Time Setting: Allows the unit to ran at half the power so the fan noise is kept down.

7) Boost / Reduce Charging: The B2Bs ensure batteries get the correct charging profile irrespective of high or low input voltages.

8) B2B turns on at 13.3V and turns off at 13.0V (x 2 for 24V).  Thus, does not drain input battery.  Regenerative braking mode allows the input voltage to drop to 12.2V (x 2 for 24V).

9) Customizable Profile: Choose your own charging profile on the front panel.

10) 9 preset battery chemistry options: Including AGM, LiFePO4, Gel, Flooded and sealed lead acid.

11) 4 stage battery charging: Thge B2B charges batteries between 5-20 times faster than a stand alone alternator.

12) Very Simple to install: No electronic Control Unit (ECU) issues.  No complex wiring.  No warranty issues.  Fully prepared for smart alternators (regenerative braking).

Remote control optional.


Spare parts also available in drop-down menu. Fan dimensions are ::

40mm x 40mm x 28mm   - 2w rated.