The 61Wh battery is 40%(17% before 55Wh discount) more expensive than 55Wh, and it’s only has 11% more energy.
To make matters worse, as I recently discovered the 61Wh has artificial degradation after 100 cycles, lowering the voltage from 17.8V to 17.6V(55Wh’s Limited Charging Voltage), downgrading the 61Wh battery to 55Wh even if you maintain the battery by only charging to 75% to 80%.
Might as well use a 55Wh and limit 80~85%