Eranger Montana Ladies E-Bike
Part of the problem with new technologies is that it is difficult to have a universal standard. Also the as the technology improves things get smaller  stronger,cheaper,etc. This causes items to become obsolete quickly. In the U.S. there are several  battery specific retailers (Interstate Battery for one) that have the ability to repair or rebuild batteries packs. They open the case replace damaged or worn out cells and reassemble them. This can be a pricey purchase . My employer spent $800 U.S. for a rebuilt battery pack for a Infra-Red camera that was $14,000 when new. In that case, a worthwhile investment. Depending on how many damaged cells need replacement it it may or not be cost efficient in your case.