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Maintaining rechargeable batteries on backup aids

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I currently have Phonak Audéo P90 aids and will be receiving Audéo I90-Spheres tomorrow. I’m wondering about best practices to maintain the batteries in the Audéo P90s that will be the backup set?
I believe for lithium ion, it’s recommended to store long term at 40 -60% charge, and it’s not ideal to store at 100%. Easy enough to accomplish the 40-60% by using them for part of the day, but then how long would they hold that charge before going dead and possibly not being able to be recharged at a later date?
I’m considering recharging them at 6 months then draining to 40-60% again before they go back in storage. Any experts care to weigh in?

The programming software (Target) has a feature called “Stock mode” which is used when the aids are not going to be used for a long time. The stock mode disables when you put the aids in the charger.

This thread was about the same topic:

Long Time Storage of Rechargeable Hearing Aids
I’m about to acquire new rechargeable ha’s, but haven’t picked one as yet. But that means my current Phonak Paradise ha’s will be needed as a back up. How should they be stored? Should they be in the plugged in charging box or just left to drain?

Thats real good to know, thanks. I missed that post when looking for answers. Still a little curious because it doesnt mention anything about about storing at 40 - 60% charge. Perhaps they’re not overly worried about some battery degradation that occurs when stored with a full charge.

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