Comparison · Batteries

Reliance INR21700-RS50 or Westinghouse WA640N-F1 6V 4Ah

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: Reliance INR21700-RS50 (40 A vs. 2); Resistance: Reliance INR21700-RS50 (3 mΩ vs. 20).

Model	Reliance INR21700-RS502026Read review →	Westinghouse WA640N-F1 6V 4Ah2023Read review →
Test current, A	40	2
Resistance, mΩ	3	20
Review conclusion	With reservations	With reservations

Only in one review: Current 70 A (Reliance INR21700-RS50); Capacity 5200 mAh (Reliance INR21700-RS50); Capacity at high current 1536 mAh (Westinghouse WA640N-F1 6V 4Ah); Energy 14.9 Wh (Westinghouse WA640N-F1 6V 4Ah); Weight 660 g (Westinghouse WA640N-F1 6V 4Ah).

Reliance INR21700-RS50: High capacity and strong results, but they heat up and sag under heavy load; the author preferred EVE for high loads.

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

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.