Oh!, according to supplier, it should last 30mins++, but yet to fully test it, kindda think about 20mins++ depending on your work loading/running style, let me test and confirm first. Fyi, i'm splitting the battery load by 2, that's why i'll hv 2 batteries, bigger one for hyd functions while the smaller one for undercarriage tasks. It should last longer i hope.
And I also planning to put 12VDC inlet power jack/port at back cover for DC cable to connect to a household transformer, so no need to worry about run time out, as you'll have continuous supply. it may not be that cool with the cable dangling around at the back, but i think it worth the fun, what do you think..?