ProTrek Batteries Baby-G Batteries Battery type Size Price CR1025 10 x 2.5 mm $3+ on Amazon CR1216 12.5 x 1.6 mm $3+ on Amazon CR1220 12.5 x 2.0 mm $4+ on Amazon CR1616 16.0 x 1.6 mm $3+ on Amazon CR1620 16.0 x 2.0 mm $4+ on Amazon CR2012 20.0 x 1.2 mm $5+ on Amazon...