Some students are Botany Downs Secondary College are upset at their school’s requirements for them to set the NCEA Level 1 science exam <https://www.nzherald.co.nz/nz/news/article.cfm?c_id=1&objectid=12110032>. Their problem is with the ban on chargers, because the school says they cannot provide outlets for 450 students. So laptops have to have a 5-hour battery life to make it through the exam. Which leaves out older machines with batteries in less-than-tiptop condition. Would there be a problem allowing them spare batteries? (And temporary use of an outlet while switching over, to avoid the need to power down?) Come to think of it, do they know they can buy spare batteries?