Replacement battery no good

Please can you confirm the Make Model and OS, along with any configuration details like touch screen, backlit keyboard, SFF or tower etc etc.

Precision 7740 laptop running Win 11. Backlit keyboard. No touch screen.

The point is that its a like-for-like environment. One battery lasted 4 years; one lasted 4 months.  Same machine, same environment, same usage pattern.  In my mind, the only difference is the battery.

Hi

In my mind...

Was it a DELL or lookee-likee replacement?

Is there a fault on the Main Board causing the early demise of the replacement (and perhaps the previous),and don't rule out the PSU?

4 months, still under warranty/guarantee.

Thanks.

Genuine Dell.  A main board fault is possible.  How would I investigate?

The battery report still suggests that battery is OK, so the customer service bots declined to get involved.

I've attached the battery report that shows predicted battery life of 5+ hours plus recent usage report of < 2 hours.

As this is a system that's about 6-7 years old, even if it was sold as "new", it's very possible the battery could be aged -- batteries deteriorate from age as much as they do from use.

On the battery is the Dell part number -- post that and someone can look at the string and determine the date of manufacture of the battery.

Thanks. It was bought as a genuine replacement battery from Dell on 09/02/26. 

It could still be multiple years old -- you will need to supply the complete Dell part number on the battery, not just the order number, for anyone to advise.

Generally, new OEM batteries are produced for 3-4 years following a system's release, meaning the battery could date from anywhere between 3 years ago and 6-7 years ago - in other words, it may have been sold as new but could have been old stock.

Is this the part number? CN-00WMRC-SLW00 58L-400S-A11

If this was sold from a stock of old batteries (as new), how can I ensure it doesn't happen again if I order another one?