Haven’t been in here for a while so good to be back. I have an old Wisper 906XC. I converted it from front hub to a mid drive Bafang Bbso1 with kit from Woosh. It’s been v good but for health reasons now need some more grunt for climbing steep hills on Exmoor. So planning to swap the 36v Bafang for a 48v Tdsv8 from Woosh. But existing Wisper battery is behind the seat post and called I think a Silverfish type. Woosh don’t do those. So can anyone recommend a good 47v Silverfish type - say 15ah and with good cells and BMS. I really like the bike - it looks good and is v comfortable for me so want to keep it - just give it more grunt on hills. Thanks.