OPTIMATE 4 BMW CANbus 12V Battery Charger Tester Maintainer

OptiMate has 9 Manufacturer Endorsements, 20+ years development, Over 1,500,000 happy customers, MCN Product of the Year Award Winner and British Dealer News Best Retail Product Award Winner!


The OptiMate 4 BMW CAN-bus package is the latest version of the multiple award-winning OptiMate 4 Dual Program pre-packed with O9 DIN plug cable and with CAN-bus mode pre-selected, ready for use with BMW CAN-bus motorcycles out of the box. This is a hassle-free solution for owners of CAN-bus equipped BMW bikes to charge via the 12V power socket. This model can also be used in normal mode with other bikes and cars using the supplied clamp lead however please note the battery eyelet lead is not included in this package as it is assumed the O9 lead will normally be used.

The REAL & unique 6-step battery optimiser specially designed for all modern 12V starter batteries from 2.5 to 50 Amp-hours capacity.

Diagnoses, recovers, charges, checks & maintains your battery automatically for months. All major battery manufacturers recommend maintaining starter batteries FULLY CHARGED during periods of non-use. OptiMate 4 is totally safe for months-long connection and maintenance of irregularly or seasonally used batteries even while still connected to the vehicle. The sophisticated charging algorithm ensures no risk of over-charging.

Suitable for all types of rechargeable 12V lead-acid batteries: filler cap types; absorbed glass mat (AGM or "MF"); valve regulated (VRLA); GEL-electrolyte. As simple as 1-2-3: Just connect OptiMate 4 to your battery, the rest is automatic. Electronically protected against user errors. There is no switch, no fuse and there are no sparks.

Delivered with two interchangeable connection sets, one with clamps for bench charging, the other with DIN plug for connection to BMW 12V auxiliary power socket.

How it works

1. Switch between STANDARD or CAN-BUS program with a simple procedure: connect clamps together, connect to mains, wait for the LED’s to confirm program change, disconnect clamps. LED indication confirms the CAN-BUS program is active. Once selected, the chosen program is saved as the default mode for next use, but you can switch programs as many times as you want. The OptiMate 4 BMW CAN-bus model is delivered preset in CAN-bus mode.

2. Safety check: OptiMate 4 will proceed to charge if the battery voltage can maintain above 2V during the initial start up diagnosis, even if the battery was at 0.5V before connection.

3. Functionality: OptiMate 4 microprocessor checks the system for correct operation (LEDs flash briefly to confirm).

4. Pre-qualification test: OptiMate 4 indicates the battery condition prior to charging.

5. Desulphation and recovery: STANDARD (up to 16V) engages automatically to recover neglected, flat batteries from a sulphated to a chargeable state. For badly neglected batteries the TURBO stage (max 22V) engages if vehicle electronics are not detected or the battery is out of the vehicle. The turbo stage is disabled in CAN-bus mode. The safe low voltage PULSE recovery engages for the final 15 minutes.

6. Bulk charge: a constant current of 1A is delivered until the voltage reaches 14.3V.

7. Absorption and equalisation: Current is delivered in pulses to bring the battery to full charge in the shortest possible time.

8. Charge verification and short circuit / dead cell check: Charge acceptance is monitored, to detect internal damage and prevent unnecessary charging of an unrecoverable battery that cannot be recovered. An undamaged battery requiring further charging will revert to pulsed absorption.

9. Voltage retention test: is conducted for 30 minutes during which no charge current is delivered, with 5 possible test results indicating the battery's general state of health. The pre-qualification test can be used to detect batteries that may hold a charge initially, but lose charge overnight.

10. Charge maintenance: a voltage of 13.6V is delivered for 30 minutes following each voltage retention test, with sufficient current to sustain it against natural self-discharge or drain from permanently active vehicle components or connected accessories (alarm, immobiliser). The voltage retention test and charge maintenance periods continue alternating half-hourly until the battery is disconnected. The test result is updated during each subsequent test.

11. CAN-bus program: the KEYLESS activation program guarantees automatic re-opening of the connection even with the ignition turned off.

12. The alternating test and charge maintenance program is designed to provide the recommend maintenance voltage for AGM / GEL batteries whilst reducing the average voltage as required by STD filler cap batteries, making it ideal for indefinite and 100% safe long term maintenance charging of any type of 12V lead-acid battery.
Technical Specifications

Recommended for: AGM/MF, STD, GEL and spiral cell batteries from 2Ah to 50Ah
Long term maintenance: Up to 75Ah
Programme control: Microprocessor, 6 stages, fully automatic
Input Voltage: 100–240V; 50-60Hz
Input current max: 0.15A @ 230V; 0.27A @ 100V
Typical annual energy cost: Less than £1.00 per year (continuous maintenance)
Reverse drain current: Less than 0.5mA
Output current (bulk charge): 1A
Automatic desulphation: 2 stages (recovery and Turbo-recovery)
Charge time limit: 48 hours (maintenance time: unlimited)
Maintain / test cycles: 30 min/30 min (alternating hourly)
Charge retention test: 5 possible results from ‘good’ to ‘bad’
Size: 200 x 75 x 61mm
Weight: 1000g
Enclosure classification: IP54
Mounting: Easy direct wall mounting
Input cable length: 2m
Output cable length: 2m
Included Accessories: O9 DIN Plug Lead; O4 Clamp Lead for bench charging
Operation temperature range: -40°C / +40°C
Warranty: 3 years