Comparison · Batteries

Sanyo NCR20700B or Samsung INR21700-40T

Two models side by side: measurements taken by the author in their reviews, and their conclusions. The better value in each row is highlighted.

In brief: Based on review measurements: Test current: Samsung INR21700-40T (37 A vs. 20).

Model	Sanyo NCR20700B2019Read review →	Samsung INR21700-40T2019Read review →
Current, A	15	35
Capacity, mAh	4200	4200
Test current, A	20	37
Review conclusion	With reservations	Recommended

Only in one review: Capacity at high current 3943 mAh (Sanyo NCR20700B); Energy 15.22 Wh (Sanyo NCR20700B); Temperature rise 100 °C (Samsung INR21700-40T).

Sanyo NCR20700B: High capacity for its size, but heat and the unusual format limit its use; the author would choose 21700 if possible.

Samsung INR21700-40T: The cell sustains 30–35 A, handles 40 A briefly, and is well suited to power-tool packs.

Figures were taken from the review text and checked against the quoted passages. Measurement conditions differ between reviews, so read the reviews yourself before buying. Prices at the time of review.