According to the operators manual:
"Because the power handle is a sealed unit for protection from moisture, and for infection control and protection of the patient and our employees, the power handle is not repairable and the battery may not be replaced"
http://healthygumsandteethnow.com/services/rotadent-step-electric-toothbrush/rotadent-step-electric-toothbrush-faq/
No it is an internal battery and the manufacturer, although realizing that the battery life seems to be an issue, has not offered a fix for the problem.
If a Rota-Dent electric toothbrush isn't holding its charge, it could be due to a few reasons: the battery may be old or defective, leading to diminished capacity; the charging contacts might be dirty or misaligned, preventing proper charging; or it could be experiencing a software glitch. Regular maintenance, like cleaning the charging contacts and replacing the battery if necessary, can often resolve these issues. If problems persist, contacting the manufacturer for support or a replacement may be necessary.
To replace the battery in a Casio 1827 watch, place a soft cloth under the face of the watch to prevent scratches. Locate the small dent on the back of the watch and slide the blade of the knife under the back so that it pops off. Remove the old battery, replacing it with a new one and returning it to the same position. Replace the back of the watch.
If you need a battery then there is nothing that can replace it.
Nino Rota's birth name is Giovanni Rota Rinaldi.
if the battery gets weak and useless, then you have to replace it...
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Titina Rota was born in 1899.
Randy Rota was born in 1950.