Sena says these 20S units are nonserviceable...you decide!
Sena customer service, said they do not sell the replacement battery for their 20S com set...so I took things into my own hands.

This is the link for the battery that I used:
https://vod.ebay.com/vod/FetchOrderDe...


Should you have any problems with this modification....you accept all responsibility since I can not assure that you will not make a mistake.

UPDATE: A viewer Chris found that the battery that is needed can be found at:
https://www.amazon.com/BrightTeaLith...