they will make the battery smaller like they have been doing
Actually, with very few exceptions, Apple has steadily increased battery size over the years:
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iPhone 3GS 1219 mAh
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iPhone 4 1420 mAh
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iPhone 4s 1432 mAh
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iPhone 5: 1440 mAh
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iPhone 5s 1570 mAh
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iPhone 6 1810 mAh
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iPhone 6 Plus 2915 mAh
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iPhone 6s 1715 mAh
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iPhone 6s Plus 2915 mAh
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iPhone SE 1624 mAh
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iPhone 7 1960 mAh
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iPhone 7 Plus 2900 mAh
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iPhone 8 1821 mAh
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iPhone 8 Plus 2675 mAh
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iPhone X 2716 mAh
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iPhone XS 2658 mAh
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iPhone XS Max 3174 mAh
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iPhone XR 2942 mAh
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iPhone 11 3110 mAh
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iPhone 11 Pro 3046 mAh
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iPhone 12 2815 mAh
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iPhone 12 Pro 2815 mAh
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iPhone 12 Pro Max: 3687 mAh
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iPhone 12 Mini 2227 mAh
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iPhone 13 3227 mAh
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iPhone 13 Mini 2406 mAh
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iPhone 13 Pro 3095 mAh
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iPhone 13 Pro Max: 4353 mAh
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iPhone 14 3279 mAh
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iPhone 14 Pro 3200 mAh
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iPhone 14 Pro Max: 4323 mAh
-
iPhone 14 Plus 4325 mAh
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iPhone 15:: 3349 mAh
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iPhone 15 Pro:: 3274 mAh
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iPhone 15 Pro Max:: 4422 mAh
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iPhone 15 Plus:: 4383 mAh