I’m a psoriatic and even with medicated shampoos, I produce a lot of dandruff. Recently a new younger dermatologist suggested that I alternate between ketoconazole (brand name: Nizoral) and zinc pyrithione (brand name: e.g., Head and Shoulders). Using both, one after the other (probably my dermatologist wants alternate showering days) has really reduced dandruff to point where I don’t find some always sitting in microphone openings. I take HA’s out once a day to recharge following battery management strategy of keeping within 30% to ~70/80% charge range-when I did and noticed excessive wax or dandruff in openings, I’d vacuum the HA’s the better to hear. I’d probably spend 15 to 20 seconds vacuuming each microphone slot from different angles or directions, e.g. rotating the HA body 90 degrees, 180 degrees, etc.!
With all Quattros up to the final “refurbished” HA’s, timing the length of time to go from 60% charge to 40% charge was always very close to 6 hours or more in length (charge checking every minute until 4 LED charger lights come on-means aids just crossed 60% full charge, check every 15 minutes for charge level as 5.5 hours runtime approaches). The refurbished hearing aids I initially checked EVERY 15 minutes or so for their full run-time and estimated full charge span based on discharge to 80%, 60%, 40%, 20%, 10% full-charge (I would shut down and restart the HA’s when I went to sleep, etc.). Unlike REALLY GOOD Quattros, I noticed that the problematic refurbished left ones did not go down evenly between charge levels (they drop from 60% to 40% quite rapidly even though the software/firmware indicates that they last ~6 hours between 100% and 80%. They also “charge up” much more rapidly than a normal Quattro-as one might expect if capacity is defective. I don’t think it’s the normal luck of the draw on Quattros. Every previous Quattro had a great battery lifespan. I decided the discharge to 10% with all BT turned off on iPhone was the fairest away of evaluating the defective (IMHO) refurbished Quattros, since it measures the time to run through 90% of the possible charge capacity and inherently takes into account any uneveness in the 20% decrement ranges. The previous Quattro timings were always done with BT turned on my Galaxy Note 8 or iPhone and with ~1 to 1.5 hours of BT streaming per day. So I gave the refurbished ones much more opportunity to have a longer battery life and, IMHO, they flunked the test.
Um_bongo has noted problems with Quattro batteries over in the U.K. and has stated on the forum that he (or the firm that he’s associated with) extracted an extended warranty out of ReSound, at least with respect to batteries, as a result of uneven battery reliability with Quattros. For me, my refurbished ones are the first Quattros I’ve noticed a battery problem worth complaining about and I’ve been through about half a dozen previous replacements most likely due to some bad usage on my part (like possibly Jodi-Vac way overuse).