I don't know about this. You may want to call Bose customer service and ask them about this.

Today, I swiped down my the top of my smart phone and it revealed that I had 50 percent of my battery level remaining in the hearing aids. This was just prior to 12 noon. At 8 O'clock tonight I was down to 13 percent. The batteries were the ones I installed yesterday. I am really happy with these hearing aids.

Good luck,

Gary cool
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!

K+E=W (Knowledge Plus Experience = Wisdom.)