Bodycontactau saidSearch around for battery suppliers, they may be able to replace them for you.
Yes, but the battery might be counterfeit; it happened to me.
The batteries for my cordless 'phones had lost capacity so I got on the Internet to find replacements. I ordered them and the arrived. They looked exactly like the original batteries except for some minor difference in the name. They worked at first but during recharge they became quite warm then would operate the cordless 'phones for only a few minutes. I concluded that instead of being proper rechargeable batteries they were probably regular dry batteries.
The Internet can be a good source of items, but what you get can be counterfeit. That applies to batteries, medications, clothing, etc. etc.
Also, in some cases, the real replacement batteries may cost almost as much as replacing the device itself. Sometimes it makes more sense to get equipment powered with a power cord connected to the wall outlet.
I have Oster clippers which were recommended by someone here. They work fine although the cord is a slight nuisance. Also, they are not continuous duty; they will overheat which is why the instructions state a maximum run time. However, they will generally do the job before overheating.