Replace puffy batteries

[tpoomlmly]

Lots of batteries are too puffy and we won't have enough if we just throw them away

We should add replacement batteries to the next Smallpeice budget

[tpoomlmly]

(we didn't get any replacement batteries for SP2023)

[tpoomlmly]

We have about 25 batteries at the moment (down from about 45)

We should make sure we have at least 30