I can recommend LVBU Technologies.
I can recommend LVBU as a company to purchase an Ebike conversion kit from. I purchased the KF series battery with a front wheel motor 250 Watts power in July 2022 for £360 US $. I ordered directly from China. Shipping took approximately 7 weeks. The motor is still excellent after two and a half years. With my LVBU conversion kit fitted cycling up hills or into the wind is noticeably easier. The batteries provided have proven safe to charge. I managed to ride 60 miles at 50% assist on one journey. I’m a fit man though and capable of comfortably riding long distances with or without a motor on a bicycle. I’ve corresponded with Miya and Roa, mostly with Miya using Wattsapp. LVBU Technologies provides an after sales service. For example I ordered another battery, the F30 battery. The battery represents an upgrade to the batteries supplied in my original order. So yes I can only offer positive words about LVBU Technologies as a company to order their ebike conversion kits from. P.S. I ride in the UK.