OptiMate 4 Quad Program TM-638 Premium BMW inc O19

Good purchase quality service and delivery

Great product. Easy to understand and use. I have it hooked up to my bike, which has a lithium battery and it’s working like a charm.

Does exactly as described, can't fault it. I particularly like the way I can use the accessories socket on my BMW to charge the battery, no messing around with removing the seat to get to the battery.