I see that there are a lot of different solutions on the Lipo front. The M10 Lipo's have a 14,8V Voltage and 2.6 Ah. Is it stupid when I say it's possible to use other Lipo's with the same voltage but with higher Ah, so they will last longer on the job?
Yes they would last longer. And depending on the battery charger you are using would also take a proportionally longer time to charge.