I've seen plenty of posts online saying you absolutely need to buy a name brand, but they always assume you're running tools all day on a job site. If you're not, that advice doesn't apply, and following it will cost you money you don't need to spend. Off-brand power tool batteries have a bad reputation that made more sense when third-party manufacturing was less reliable than it is now. You need to consider whether your situation actually calls for a name-brand battery.
Contractors and tradespeople beat up their batteries, and from what I've seen, it's only getting worse. They run them all day, charge them back-to-back, and push them hard with high-torque loads. If you are a true tradesperson who works all day, spending extra on a name-brand pack makes total sense. If you work with these tools regularly, buy extra batteries.
But if you're a homeowner who grabs a drill three or four times a year to hang shelves or assemble some flat-pack furniture, you shouldn't waste your money. You're just never going to stress the battery enough to justify the premium.
By light use, I mean driving screws into soft wood, a little drilling here and there, hanging a picture, running a work light or a jobsite fan. That basically means you have nothing demanding to do. If the battery is barely working and only drawing a fraction of what it can handle, you can probably save money on batteries.
Heat builds up inside a cell based on how much current you're pulling and how much internal resistance the cell has .
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