Stand by power WP 34s & HP 35s

[walter b]

According to my observations (matching the ones of many other folks here AFAICS) Voyagers are gold standards for low power consumption, Pioneers follow. Since you asked for my impression, I'd say the HP-30b / WP 34S / WP 31S cannot compete here. For a more solid statement that shall be measured, however - and I don't own the necessary equipment to do it.

d:-)