I have 115mm Ryobi,and find it about right for most DIY jobs, sometimes I can imagine the next size up would help with speed- and as Charlie George says above, Lidl always have plenty of 125mm discs
general comments
a 125 will only give 5mm more cutting depth over a 115mm disc
i dont know the wattage off the ryobi but iff we assume 500w and a 5ah battery we have 5x18vx60mins =5400w for a min so around 10 mins on a full battery on full load so on half load perhaps 20 mins or light load perhaps 40 mins
this can further be reduced by perhaps 10-15% for every year off the battery age assuming li-ion if its nicad it will be seconds as an old hat
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