It depends on the reseller. These are not original batteries, but generic aftermarket batteries for Huawei phones. Incidentally they have the same polarity and (almost the same width of the FP1 battery, but the height is about 1 cm smaller. That’s why you will need a spacer.
Find more compact information here:
@BertG @paulakreuzer Let’s no longer link to the other topic as its length can be intimidating and it is hard to find the information there quickly.