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Department of Defense

use rechargeble batteries to save millions (addbenefits in tags)

Excuse the abbreviations.

 

In USN, we use nonrecharge batts. If we upgraded AA batts to rechargebale, the savings could be over a $1 million.

Current batt cost as low as $.28/batt.

Approx cost of recharge batt is about $4/batt.

 

Assume = run time:

-Discharge rate nonrecharge 7.8hrs(http://data.energizer.com/PDFs/EN91.pdf)

 

-Discharge rate recharge 8.8hrs(http://data.energizer.com/PDFs/nh15-2000.pdf)

 

The Energizer website says the battery can be recharged "several hundred times"(http://data.energizer.com/PDFs/nickelmetalhydride_appman.pdf). I will assume 200 recharges.

 

One recharge =14 normal.

 

Let us say for a min, for $4, a recharge batt can replace 200 nonrecharge batts. Saving 200 x .28 = $56/batt over the batts life(probably much more).

 

For example we'll say only 10k sailors out of the entire navy use 2 batteries per week. That will be 10ksailors x 2batt/wk x 52wks = 1.04 million batts.

 

1040000 batts per yr x 0.28 dollars = $291000 per year.

 

If we replace the nonrecharge with recharge we have 10ksailors x 2 batts/wk x $4 = $80000 for the first year,recharge over weekend.

 

A min 200 charges then for 1 charge per week x 52 wks/yr = 52 charges/yr. At that rate it will take about 4 yrs before more batteries will be purchased.

 

Over the 4 yr period, nonrecharge batts yeild 4yrs x $291000/yr =$1.16 million. Where recharge batteries will cost only $80,000 ovwer that same time frame. A savings of 1.08 million dollars.

 

An initial investment of batt charges forthe same senario will be on average approx $20. 10k sailors x $20= $200000.

 

Initially and over an 8 year period yields a savings of $1.96 mill.

 

This only accounted for AA batts use with 10k sailors and a min 200 recharge. The # of sailors that use AA batteries is higher, but the # of batteries per week is probably lower. So the #s would probably be different but with the same % savings. Plus this could be spread throughout the entire Gov't. The savings would add up significantly.

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Idea No. 7479