Monday, February 9, 2015

D Batteries Cost Twice But Have Power of 3-6 AA Batteries

D Batteries Cost Twice But Have Power of 3-6 AA Batteries

If you wondered if it's worth using AA batteries in D cell holders, D batteries last about 3-6 times longer than comparable AA, which are over half the battery market, but they only cost twice as much. This makes sense when you think about the greater efficiency of a larger package for the chemicals. That means it doesn't make sense to try to use AA batteries unless you have piles of them around your house, but it WOULD make sense to use an adapter to use D cells for AA applications if you can make one.

Some rechargeable D batteries only have AA sized cells inside so look for the capacity rating.

Capacity in amp hours
Conclusion: Each D is worth about 3-6 AA cells
AA      D       Ratio
.4-1.7  8.00    3.13 Zinc Carbon 
1.8-2.6 12-18   6    Alkaline
.6-1.0  2.0-5.5 3-6  NiCd
.6-2.8  2.2-12  4    NiMH

Cost for AA 8.99 for 8-pack 1.12 each
            D 15.99 for 8-pack 2.00 each
IEC nameR20LR20FR20KR20HR20
ANSI/NEDA name13D13A13LF
Typical capacity8000 mAh12000-18000 mAh2000-5500 mAh2200–12000 mAh 
Nominalvoltage1.5 V1.5 V1.5 V1.25 V1.25 V
RechargeablenoSpecial type onlyNoYesYes

ANSI/NEDA name15D15A15LF145001.2K21.2H2 ?
Capacity under 50 mA constant drain400–1700mAh1800–2600 mAh2700–3400mAh ?600–1000mAh600–2850mAh1500–1800mAh
Nominal voltage1.5 V1.5 V1.5 V3.6 V1.2 V1.2 V1.65 V
Max. energy at nominal voltage and 50 mA drain2.55Wh3.90 Wh5.10 Wh ?1.20Wh3.42Wh2.97Wh
RechargeableNoNo, except forRechargeable alkaline batteryNo[3]YesYesYesYes

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