No.5 battery spring and No.7 battery spring

Many engineers in the design, will consider what is the 5th battery spring big or 7th battery spring?

Of course, the answer is No. 5 battery spring, because the cell height about 51. 5 mm, 14.5 mm in diam, battery weight around 23-24 g, this with other battery.7 cell height is 45 mm, about 10 mm in diameter, batteries TV with the remote control More.Different brands, as long as it is the same type of  battery spring, the same size (unless the manufacturer is not according to the national standard production), the weight will be different.Alkaline batteries much heavier than ordinary carbon batteries.When we design the battery spring, if they are made in accordance with the standard design,In order to, need not worry about the wrong size.