Maintenance and Non-OEM spares

So I need to replace the battery on my trusty vacuum bot iRobot Roomba 780. Judging from my purchase history, I have had the robot for approx. 18 months when I replaced the old original battery with a knock-off spare claiming 50% more capacity (4500mAh vs 3000mAh on the original pack).

By now, 25 more months have passed and I need to get another replacement. Just looking at the timeline, there is precious little reason to even think about getting the original part when the knockoff lasted longer than the original one.

So in case anyone is wondering, here’s what I’m getting:

-Jan