[emeritus]

From memory, the white metal-cased U2 replacement (SP2) cells did not actually claim to be leakproof. The ones I bought in the late 1960's just said "sealed". They used to cost me 5/- for a set of 6 for my tape recorder, compared with 4/- for six U2 cells. I never ever had any of the old cardboard-cased blue U2 batteries leak and only used SP2s (which did sometimes leak) after ordinary U2s were discontinued. Both types only yielded about 2Ah at the 100mA rate.