Roku has known about their remotes being battery killers for years, they've literally done nothing. When you complain about these things eventually a useless Roku moderator will come along and copy and paste troubleshooting steps that never work. They will tell you to restart your device, repair your remote, put in new batteries, basically all common sense stuff you try first before even coming here to complain.
Then once you report back that you have tried those things and they don't work the Roku moderator will respond with useless questions like asking you to provide the serial number of your device, software version, all which have nothing to do with the issue.
So you comply and give them what they want and then nothing happens, sometimes you can get them to send you a replacement remote for free, but the replacement has the same problem as the original remote you came here to complain about.
Then the cycle repeats with the next person who has a remote problem and it goes on and on for years. Roku won't actually fix the problem because they are either too stupid to know how, or they just don't care and think it's not worth the money to redesign remotes that actually work.
Even the rechargeable battery version is full of problems, mine has never fully charged to 100% ever since I got it brand new and the charge dissipates very quickly with minimal remote useage.
Bottom line is the Roku remotes are a flawed design, everybody knows it including Roku and they will not fix it. It says a lot about the company!
It's probably best to look for alternative devices at this point because this will never change with the way Roku operates. There is no true customer support here, just the illusion of it with moderators who parrot the same script lines of steps that don't work again and again, it's very sad and pathetic.