Also I am not sure if they are the exact same size as your LR44 cells. And NiMH has slightly lower voltage than alkaline. So there is a chance that the rowing machine won't like them. All in all, it would be better to frankenstein a 3 cell AA or AAA holder to the rowing machine, as Chris suggested. \$\endgroup\$ – NiZns have the highest initial voltage of any rechargeable AA or AAA battery. The nominal voltage is 1.65, and fresh out of the charger the voltage is as high as 1.85V. ( PowerGenix , PDF, and my tests) This is way higher than the 1.5V for alkalines. The higher voltage can be both a blessing and a curse. Anexample of a BCI group number is 94R. This battery group has dimensions of 12.4 x 6.9 x 7.5 inches. Its posts are located on the top and the right post is the positive terminal. Another example is a 4D group. This type of battery is intended for a commercial vehicle and has dimensions of 20.75 x 8.75 x 9.8 inches. AAAbatteries are one of the most commonly used battery sizes and our non-rechargeable product range includes single use alkaline and lithium batteries. To ensure you can always rely on our products we only stock high quality AAA batteries from market leading brands Energizer, Duracell, Panasonic, Varta, and GP. SizeMatters: In terms of size, AAA batteries are quite compact. They typically have a diameter of about 14.5mm and a height of around 50.5mm. Easy to carry around and fit QgbsF9.