## Wednesday, October 28, 2009

### Industrial Battery Lead & Acid Calculation

Does your company operate electric forklifts?  Does your state, municipality, environmental certification or corporate guidelines require you to report lead and acid quantities on-site?  If the answers to both of these questions is yes then you’ll need to know how to calculate the amount of these substances present in your fleet of forklift batteries.  We’ve worked with EnerSys for decades and find that they produce the best batteries and chargers in the marketplace.  They’ve provided us with guidelines on calculating these reportable numbers.  Take an EnerSys Workhog 18-E125-11 Battery as an example.  You’ll need the battery weight to perform the calculations, which is stamped on the side of all industrial forklift batteries.

Breakdown:
Lead in lbs: 73% of Battery Weight
Total Acid in lbs: 8% of Battery Weight
Free Acid in lbs: 15% of Total Acid
Total Electrolyte in lbs: 21% of Battery Weight
Free Electrolyte in lbs: 15% of Total Electrolyte

Example:
18-E125-11 weighs 1,796 lbs
Lead = 1,796 x .73 = 1,311 lbs
Total Acid = 1,796 x .08 = 144 lbs
Free Acid = 144 x .15 = 22 lbs
Total Electrolyte = 1796 x .21 = 378 lbs
Free Electrolyte = 378 x .15 = 57 lbs

To Find Volume in Gallons:
Weight in Lbs / (8.345 x specific gravity)
Total Acid = 144 / (8.345 x 1.300) = 144 / 10.85 = 13.3 Gallons
Free Acid = 13.3 x .15 = 2.0 Gallons
Total Electrolyte = 378 / (8.345 x 1.300) = 378 / 10.85 = 34.8 Gallons
Free Electrolyte = 34.8 x .15 = 5.2 Gallons

Clear as Mud?  Contact us if you have any questions and if we can’t give you an answer, we’ll find someone who can.