After my initial problems with handlebar battery connectors, I have been very pleased with the entire kit on all three of my bicycles. The batteries have out performed the distances indicated and the speeds are as specified. My only critique is that you have not informed me as to how I can transition from my old batteries to the new batteries as the old begins to lose their efficiency, i.e. on shorter rides use the old and longer rides use the new. Can you please advise me of how to manage this transition. I have attached photos of one of my current applications. Thank you.