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Extra battery in the gap of an HDD

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5

Some modern laptop ship with an interface M.2 NVMe for an SSD and an SATA for an HDD.

Is there ever possible to embed an extra battery in the gap of the HDD, so as to have two internal batteries? I'm all pro long battery working hours, and SSDs have become affordable. It's a pity that a gap remains empty when you don't need the HDD. It seems like a waste to me, especially when designers work hard to make laptops thinner and thinner.

hard-drive battery

share|improve this question

edited 11 hours ago

Attie

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• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Because of the nature of the HDD connection inside, such a battery accessory would be entirely unique by manufacturer. No such generic device (because of the damage that could ensue if connections were incorrect)
  
  – John
  11 hours ago
  

  
  
  
  


• 
  
  
  

  
  4
  

  
  
  
  
  
  

  
  
  For IBM/Lenovo laptops there exist(ed) Ultrabay batteries to replace an optical drive with a battery (and adapters to replace an optical drive with a HDD), but I don't know any battery that would replace just a HDD.
  
  – Freddy
  11 hours ago
  

  
  
  
  


• 
  
  
  

  
  3
  

  
  
  
  
  
  

  
  
  Ironically this used to be the norm many years ago. My Dell Latitude C-series laptop circa 2005-ish had an accessory bay where you could swap the optical drive for a floppy module or an extra battery module. Older Apple PowerBooks from the early 2000s had this feature too. The industry has simply moved away from this design due to the never-ending quest for smaller and lighter computers.
  
  – Wes Sayeed
  10 hours ago
  

  
  
  
  

add a comment
 | 

5

Some modern laptop ship with an interface M.2 NVMe for an SSD and an SATA for an HDD.

Is there ever possible to embed an extra battery in the gap of the HDD, so as to have two internal batteries? I'm all pro long battery working hours, and SSDs have become affordable. It's a pity that a gap remains empty when you don't need the HDD. It seems like a waste to me, especially when designers work hard to make laptops thinner and thinner.

hard-drive battery

share|improve this question

edited 11 hours ago

Attie

13.9k44 gold badges3737 silver badges5252 bronze badges

asked 11 hours ago

Quora FeansQuora Feans

27533 silver badges1616 bronze badges

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Because of the nature of the HDD connection inside, such a battery accessory would be entirely unique by manufacturer. No such generic device (because of the damage that could ensue if connections were incorrect)
  
  – John
  11 hours ago
  

  
  
  
  


• 
  
  
  

  
  4
  

  
  
  
  
  
  

  
  
  For IBM/Lenovo laptops there exist(ed) Ultrabay batteries to replace an optical drive with a battery (and adapters to replace an optical drive with a HDD), but I don't know any battery that would replace just a HDD.
  
  – Freddy
  11 hours ago
  

  
  
  
  


• 
  
  
  

  
  3
  

  
  
  
  
  
  

  
  
  Ironically this used to be the norm many years ago. My Dell Latitude C-series laptop circa 2005-ish had an accessory bay where you could swap the optical drive for a floppy module or an extra battery module. Older Apple PowerBooks from the early 2000s had this feature too. The industry has simply moved away from this design due to the never-ending quest for smaller and lighter computers.
  
  – Wes Sayeed
  10 hours ago
  

  
  
  
  

add a comment
 | 

Some modern laptop ship with an interface M.2 NVMe for an SSD and an SATA for an HDD.

Is there ever possible to embed an extra battery in the gap of the HDD, so as to have two internal batteries? I'm all pro long battery working hours, and SSDs have become affordable. It's a pity that a gap remains empty when you don't need the HDD. It seems like a waste to me, especially when designers work hard to make laptops thinner and thinner.

hard-drive battery

share|improve this question

edited 11 hours ago

Attie

13.9k44 gold badges3737 silver badges5252 bronze badges

asked 11 hours ago

Quora FeansQuora Feans

27533 silver badges1616 bronze badges

share|improve this question

edited 11 hours ago

Attie

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asked 11 hours ago

Quora FeansQuora Feans

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share|improve this question

edited 11 hours ago

Attie

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asked 11 hours ago

Quora FeansQuora Feans

27533 silver badges1616 bronze badges

edited 11 hours ago

Attie

13.9k44 gold badges3737 silver badges5252 bronze badges

edited 11 hours ago

Attie

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asked 11 hours ago

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asked 11 hours ago

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2 Answers
2

active

oldest

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5

This is an interesting idea but isn't feasible for multiple reasons.

Limited capacity:

The laws of physics aren't on your side here.

Battery energy capacity is directly proportional to size and weight. In this case, the dimensions are particularly small and the weight can only be increased to compensate for the small size to a very limited extent:

Electrical connection challenges:

Another problem would be connecting the battery electrically, which would be difficult, if not impossible. Battery connections vary from manufacturer to the next, making it impossible to design a one-size-fits-all solution.

Better options already exist:

For some laptop models, it's possible to buy oversized laptop batteries that extend beyond the laptop chassis:

Alternatively, many ultrabook lines, such as the HP Envy 13, are designed without a redundant 2.5" hard drive slot altogether, offering only M.2 NVMe storage.

For these models, the problem has already effectively been engineered out of existence and there is no wasted space to begin with:

share|improve this answer

edited 6 hours ago

answered 11 hours ago

wreccleshamwrecclesham

1,50433 silver badges1717 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I would mention here that battery capacity is directly related to weight. Energy density is expressed in joules per kilogram (j/Kg) and is a hard physical property for a given battery chemistry. If you want extra energy, you need extra weight and volume, no two ways around it.
  
  – Wes Sayeed
  10 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Good point. I've included a mention of battery weight as well. 🔋
  
  – wrecclesham
  9 hours ago
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  I don't really buy the size argument. Consider that I can fit a phone battery (~15 Wh) in the standard dimensions of a 2.5" HDD, with room to spare. It's common for laptops these days to come with a ~45 Wh (or even 30 Wh, though those tend to be smaller laptops without the 2.5" bay) battery. That's 30% extra capacity. Anywhere from an extra 1 to 3 hours depending on usage.
  
  – Bob
  2 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Bob that's my point. A meagre ~30% extra battery life probably wouldn't justify spending much money for the average consumer. The limited space severely limits the potential battery life extension and is likely to be a contributing factor, although certainly not the only reason, why such a product does not exist.
  
  – wrecclesham
  1 hour ago
  

  
  
  
  

add a comment
 | 

3

"designers work hard to make laptops thinner and thinner" … sure, but that's so you buy this year's model, not so you can stuff extra batteries in an old one.

Market forces + difficulty in making anything like that with a 'universal fit' makes this extremely unlikely to ever happen.

share|improve this answer

answered 11 hours ago

TetsujinTetsujin

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add a comment
 | 

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5

This is an interesting idea but isn't feasible for multiple reasons.

Limited capacity:

The laws of physics aren't on your side here.

Battery energy capacity is directly proportional to size and weight. In this case, the dimensions are particularly small and the weight can only be increased to compensate for the small size to a very limited extent:

Electrical connection challenges:

Another problem would be connecting the battery electrically, which would be difficult, if not impossible. Battery connections vary from manufacturer to the next, making it impossible to design a one-size-fits-all solution.

Better options already exist:

For some laptop models, it's possible to buy oversized laptop batteries that extend beyond the laptop chassis:

Alternatively, many ultrabook lines, such as the HP Envy 13, are designed without a redundant 2.5" hard drive slot altogether, offering only M.2 NVMe storage.

For these models, the problem has already effectively been engineered out of existence and there is no wasted space to begin with:

share|improve this answer

edited 6 hours ago

answered 11 hours ago

wreccleshamwrecclesham

1,50433 silver badges1717 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I would mention here that battery capacity is directly related to weight. Energy density is expressed in joules per kilogram (j/Kg) and is a hard physical property for a given battery chemistry. If you want extra energy, you need extra weight and volume, no two ways around it.
  
  – Wes Sayeed
  10 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Good point. I've included a mention of battery weight as well. 🔋
  
  – wrecclesham
  9 hours ago
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  I don't really buy the size argument. Consider that I can fit a phone battery (~15 Wh) in the standard dimensions of a 2.5" HDD, with room to spare. It's common for laptops these days to come with a ~45 Wh (or even 30 Wh, though those tend to be smaller laptops without the 2.5" bay) battery. That's 30% extra capacity. Anywhere from an extra 1 to 3 hours depending on usage.
  
  – Bob
  2 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Bob that's my point. A meagre ~30% extra battery life probably wouldn't justify spending much money for the average consumer. The limited space severely limits the potential battery life extension and is likely to be a contributing factor, although certainly not the only reason, why such a product does not exist.
  
  – wrecclesham
  1 hour ago
  

  
  
  
  

add a comment
 | 

5

This is an interesting idea but isn't feasible for multiple reasons.

Limited capacity:

The laws of physics aren't on your side here.

Battery energy capacity is directly proportional to size and weight. In this case, the dimensions are particularly small and the weight can only be increased to compensate for the small size to a very limited extent:

Electrical connection challenges:

Another problem would be connecting the battery electrically, which would be difficult, if not impossible. Battery connections vary from manufacturer to the next, making it impossible to design a one-size-fits-all solution.

Better options already exist:

For some laptop models, it's possible to buy oversized laptop batteries that extend beyond the laptop chassis:

Alternatively, many ultrabook lines, such as the HP Envy 13, are designed without a redundant 2.5" hard drive slot altogether, offering only M.2 NVMe storage.

For these models, the problem has already effectively been engineered out of existence and there is no wasted space to begin with:

share|improve this answer

edited 6 hours ago

answered 11 hours ago

wreccleshamwrecclesham

1,50433 silver badges1717 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I would mention here that battery capacity is directly related to weight. Energy density is expressed in joules per kilogram (j/Kg) and is a hard physical property for a given battery chemistry. If you want extra energy, you need extra weight and volume, no two ways around it.
  
  – Wes Sayeed
  10 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Good point. I've included a mention of battery weight as well. 🔋
  
  – wrecclesham
  9 hours ago
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  I don't really buy the size argument. Consider that I can fit a phone battery (~15 Wh) in the standard dimensions of a 2.5" HDD, with room to spare. It's common for laptops these days to come with a ~45 Wh (or even 30 Wh, though those tend to be smaller laptops without the 2.5" bay) battery. That's 30% extra capacity. Anywhere from an extra 1 to 3 hours depending on usage.
  
  – Bob
  2 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Bob that's my point. A meagre ~30% extra battery life probably wouldn't justify spending much money for the average consumer. The limited space severely limits the potential battery life extension and is likely to be a contributing factor, although certainly not the only reason, why such a product does not exist.
  
  – wrecclesham
  1 hour ago
  

  
  
  
  

add a comment
 | 

This is an interesting idea but isn't feasible for multiple reasons.

Limited capacity:

The laws of physics aren't on your side here.

Battery energy capacity is directly proportional to size and weight. In this case, the dimensions are particularly small and the weight can only be increased to compensate for the small size to a very limited extent:

Electrical connection challenges:

Another problem would be connecting the battery electrically, which would be difficult, if not impossible. Battery connections vary from manufacturer to the next, making it impossible to design a one-size-fits-all solution.

Better options already exist:

For some laptop models, it's possible to buy oversized laptop batteries that extend beyond the laptop chassis:

Alternatively, many ultrabook lines, such as the HP Envy 13, are designed without a redundant 2.5" hard drive slot altogether, offering only M.2 NVMe storage.

For these models, the problem has already effectively been engineered out of existence and there is no wasted space to begin with:

share|improve this answer

edited 6 hours ago

answered 11 hours ago

wreccleshamwrecclesham

1,50433 silver badges1717 bronze badges

share|improve this answer

edited 6 hours ago

answered 11 hours ago

wreccleshamwrecclesham

1,50433 silver badges1717 bronze badges

answered 11 hours ago

wreccleshamwrecclesham

1,50433 silver badges1717 bronze badges

answered 11 hours ago

wreccleshamwrecclesham

1,50433 silver badges1717 bronze badges

3

"designers work hard to make laptops thinner and thinner" … sure, but that's so you buy this year's model, not so you can stuff extra batteries in an old one.

Market forces + difficulty in making anything like that with a 'universal fit' makes this extremely unlikely to ever happen.

share|improve this answer

answered 11 hours ago

TetsujinTetsujin

20k66 gold badges4545 silver badges7474 bronze badges

add a comment
 | 

3

"designers work hard to make laptops thinner and thinner" … sure, but that's so you buy this year's model, not so you can stuff extra batteries in an old one.

Market forces + difficulty in making anything like that with a 'universal fit' makes this extremely unlikely to ever happen.

share|improve this answer

answered 11 hours ago

TetsujinTetsujin

20k66 gold badges4545 silver badges7474 bronze badges

add a comment
 | 

"designers work hard to make laptops thinner and thinner" … sure, but that's so you buy this year's model, not so you can stuff extra batteries in an old one.

Market forces + difficulty in making anything like that with a 'universal fit' makes this extremely unlikely to ever happen.

share|improve this answer

answered 11 hours ago

TetsujinTetsujin

20k66 gold badges4545 silver badges7474 bronze badges

share|improve this answer

answered 11 hours ago

TetsujinTetsujin

20k66 gold badges4545 silver badges7474 bronze badges

answered 11 hours ago

TetsujinTetsujin

20k66 gold badges4545 silver badges7474 bronze badges

answered 11 hours ago

TetsujinTetsujin

20k66 gold badges4545 silver badges7474 bronze badges