For 2pcs AAA, 47x28x15mm/1.85x1.1x0.59". For 4pcs AAA, 50x48x15mm/1.97x1.89x0.59". For 8pcs AAA, 91x53x16mm/3.58x2.1x0.63". For 2pcs AA, 54x38x18mm/2.08x1.45x0.71". Can effectively avoid causing a short circuit, safe to protect the battery and you.