By replacing the Pb accumulators shipping with Robotino with the NiMH accumulators the time of autonomous operation can be doubled. While the Pb accumulators have a capacity of 9.5Ah and an average voltage of about 23V the NiMH accumulators have a capacity of 18Ah at an average voltage of about 22.5V. The available energy of the Pb accumulators is therefor 218Wh and the energy of the NiMH 414Wh. Furthermore the NiMH cells show a much better performance over time, i.e. the amount of energy that can be stored by the NiMH remains almost unchanged after hundreds of charging cycles.
Robotino v3 is designed to load up to three NiMH accumulator packs. We recommend to install two NiMH accumulator packs because the installation of the third pack is quite complicated. Also we think that the autonomous operation time of about 8 hours and more with two NiMH packs is a reasonable value. This kit contains two packs.
The installation instructions can be found at