The real problem is that good quality cells are much of the cost of any cordless tool. And the factory buys them by the million. Thus buying just a few of similar quality for replacements can cost more than the entire drill.
No problem buying replacement cells. Just finding good ones at a good price. Indeed finding good quality ones on sale at any price can be tricky. It's no surprise that most on sale are unbranded.
You might look for any similar complete replacement battery for a decent make on special offer - and rob that of its cells.
I've bookmarked 2 sites as possible sources for the 18V Mak:
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I don't know if either is suitable yet - I took the battery out of its case and decided that I needed more time and a lot more info before risking borking it. Even the stick-backed foam didn't want to move - I blame Blue Peter!
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