I having been using this product successfully. At 8+hrs/day each battery lasts about 2 weeks. But they're rechargeable.

https://www.amazon.com/Li-ion-Rechargeable-Battery-charger-batteries/dp/B06XCSTSSV/ref=sr_1_3?ie=UTF8&qid=1515295289&sr=8-3&keywords=2032+charger+4