Please note: This is based on my experience in dealing with Dell and not necessarily Dell’s Official stance on laptop batteries.

Dell will only consider replacing a battery under warranty if the laptop is still within the first 12 months of  it’s initial warranty.

Due to the nature of batteries they deplete over time and will eventually no longer successfully hold a charge.

So if you plan to own a laptop you should factor in the cost of a new battery every 12 to 18 months.

However if you are well within the first 12 months and you get either a warning from the Dell support software basically saying “your battery is nearly at the end of life, buy a new one”.

Contact technical support and ask for a replacement under warranty.

I have had to do this several times from my fleet and each time they capitulate almost immediately.