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Line of Dell laptops designed for business users, mostly manufactured by Compal and Quanta.

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How much extra runtime does the 60Wh pack provide (Lat 7490/i7-8650U)

I am dealing with a machine that never shipped with a battery (bottom cover is intact, so I believe it may have expanded, or they removed it due to older Dell softcells expanding due to age to avoid UN3841 issues) or cable, so I need to install a battery.

However, I have a choice:

  • Match the original 3 cell 42Wh battery (retains 2.5” HD bay)
  • Install the 60Wh pack (will lose 2.5” HD bay)

On average, how much of a difference does the extra 18Wh gained by giving up the 2.5” bay? With how cheap NVMe SSDs are these days, it’s looking like a compelling upgrade path to me, especially since I’m starting over on SSD storage, RAM (originally 16GB, stripped down to 4GB) and the 2.5” drive if it was ever present and I did not get the drive caddy with the laptop so I think mine never had it but the previous owner decided to leave the option there by getting the smaller pack.

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Hi @nick ,

There may be too many variables to be accurate i.e. system power requirements over the same amount of time in use e.g if gaming then high CPU/GPU/ram demand plus audio and inputs etc versus just browsing or doing less demanding tasks etc.

You’re getting a 30% increase in power availability but this may not translate into the same increase in actual time duration.

Also being of a greater capacity means although it will last longer between charges it will also take longer to fully recharge, when being charged.

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My thinking is even if I only gain a few minutes and I take a hit on charge time, I kill ExpressCharge in the BIOS anyway (on a fresh pack) as it's part of the reason for expanded Dell flatcell packs. It's not an immediate battery killer, but it adds to the problem on aged batteries. It also comes down to my CPU - it's the i7 4C/8T 15W chip, and it's not the less demanding i5 version (same core count) so I may want that 30% bump.

My other reason for at least looking into it is since NVMe is affordable, I may never use the 2.5" option on the laptop anyway.

da

@nick

It may come down to economics then.

If you can afford the larger capacity battery and the NVMe and also if future extra storage is unlikely (although perhaps the prices will come down so that you just then upgrade the existing storage) it may be the way to go rather than ruing the fact that you didn't do it at the time when you could. ;-)

da

@jayeff The only reason I have it is the Win11 8th gen BS - it's licensed for 10 Pro, so I have something here which can be upgraded when Win11 Pro is stable and I know my LJ 1200 will work.

da

@nick

It may then depend on what you want to do with it as a practical working PC where having sufficient battery power is desirable and also whether you have sufficient storage etc for what you need to use the laptop for or whether these aren't that important and you can manage with less.

Cheers

da

@jayeff I looked into the service manual and I no longer see the 2.5" bay option - that ended on some of these newer NVMe laptops. It seems to be more of a thing to accommodate the smartcard reader which mine didn't come with anyway, nor chassis provisions (or TB3; mine has DP/USB-C). Normally I try to be +1 generation over the baseline, but the differences between 8th and 9th gen aren't that great. You already go from 2C/4T to 4C/8T with 8th gen which is the huge upgrade - I may add 7th to the new shortlist if Microsoft realizes their mistake, but still favor 8th for the extra cores.

It basically comes down to price vs CPU installed, it seems. Like I have a high end model, so it may help but on the other hand if I'm running it hard it may not be as big of a gain vs the smaller more common battery. Whereas if I had an i5 I may have more legitimate battery gains - which I normally prefer, but I'll accept battery penalty for no bidding war :-).

da

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Nick sarà eternamente grato.
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