I have an electric grass cutter for my two allotments. Alas, the battery needs charging every twenty five minutes so it takes over a week of trips to an fro to do the full job. Our banknote collections need re-charging every so often as well. IT’s good to sort out the notes and keep them in order in suitable albums or folders and then to ponder over which gaps need to be filled and by doing so we give the collection a new ‘charge’ pf energy.