ProCore 18V 5.5Ah vs 4Ah Battery

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Architecture / engineering office
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I'm just wondering why the 5.5Ah battery is more than double in price than the 4Ah? There is also the issue of size and mass:

4Ah: 77 x 117 x 47 mm & 515g
5.5Ah: 77 x 117 x 69 mm & 955g

Unless I'm missing something it would make more practical sense to buy two 4Ah to get 8Ah total capacity with the added benefit of being lighter and more compact.
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Other building trade
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Sounds like it may have different batteries inside or more protection or overprovisioning. Other brands do a 4 5 and 9 amp hour battery and those get massive.
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Servicing / Maintenance
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I think that 5.5Ah battery has higher output power. As Bosch said it output is 1800W - 100A. Some new design tools need such energy. 
However, if you don't have such power request - 2 x 4Ah is better choice.  
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Bosch associate
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5.5 ah like 8 ah  battery are double HD layer Battery delivering 90 amp curent whereas ProCORE 4 ah as a single HD layer Battery delivering 45 amp  equivalent to 18vx45a=840w instant power ( no 18v anglegrinder & no biturbo machines) 
2 batteries 4ah contain as Much power as a single 8 ah  Battery but they re delivering twice less instant curent  so before considering replacing your 8  ah by two lighter 4ah batteries Check how much power your cordless tool requites We are Bosch
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Servicing / Maintenance
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Could Bosch mark it ( the output currant) on the battery? and/or mantion it on the tools?

 
created by Pitochok on 02.12.2021, 14:30 o’clock
5.5 ah like 8 ah  battery are double HD layer Battery delivering 90 amp curent whereas ProCORE 4 ah as a single HD layer Battery delivering 45 amp  equivalent to 18vx45a=840w instant power ( no 18v anglegrinder & no biturbo machines) 
2 batteries 4ah contain as Much power as a single 8 ah  Battery but they re delivering twice less instant curent  so before considering replacing your 8  ah by two lighter 4ah batteries Check how much power your cordless tool requites We are Bosch

 
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Bosch associate
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yes It would be nice to have it on thé Battery but as There are 2  Kinds of cells 18600 for standard Battery and 21700 HD for ProCORE it is 24 amp per layer With Std and 45 amp for HD per layer
I hope bosch would communicate on the 18v power tools output curant soon but keep on mind GKS GWS and Bi turbo require 90 amp minimum so double HD layer otherwise power tools will shut off quickly we are bosch 
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Bosch associate
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yes It would be nice to have it on thé Battery but as There are 2  Kinds of cells 18600 for standard Battery and 21700 HD for ProCORE it is 24 amp per layer With Std and 45 amp for HD per layer
I hope bosch would communicate on the 18v power tools output curant soon but keep on mind GKS GWS and Bi turbo require 90 amp minimum so double HD layer otherwise power tools will shut off quickly we are bosch