Comparison · Batteries

Westinghouse WA640N-F1 6V 4Ah or Sanyo NCR20700B

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: Capacity at high current: Sanyo NCR20700B (3943 mAh vs. 1536); Test current: Sanyo NCR20700B (20 A vs. 2); Energy: Sanyo NCR20700B (15.22 Wh vs. 14.9).

Model	Westinghouse WA640N-F1 6V 4Ah2023Read review →	Sanyo NCR20700B2019Read review →
Capacity at high current, mAh	1536	3943
Test current, A	2	20
Energy, Wh	14.9	15.22
Review conclusion	With reservations	With reservations

Only in one review: Current 15 A (Sanyo NCR20700B); Capacity 4200 mAh (Sanyo NCR20700B); Resistance 20 mΩ (Westinghouse WA640N-F1 6V 4Ah); Weight 660 g (Westinghouse WA640N-F1 6V 4Ah).

Westinghouse WA640N-F1 6V 4Ah: The battery tested below its rated 4 Ah capacity; the author suspects this unit may be defective.

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

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.