Optimum percentage to recharge Ring video doorbell v.4

Is there an ‘optimum’ percentage at which I should aim to recharge the battery on a Ring video doorbell Version 4, to maximise the lifespan of the rechargeable batteries?
I have a second battery so 1 is always ready to replace the discharged battery when necessary.

Hi @user12385. There is not an optimum point for recharging your batteries. The batteries can be recharged on a “as needed” basis. Batteries that are connected to solar or hardwired are constantly being charged.