A few days ago, I purchased a 8-pack of rechargeable D batteries from Tenergy’s website at all-battery.com.
Why didn’t I choose a brand name like Energizer or Duracell? That’s a good question. The reason is because, I believe, those guys don’t believe in rechargeable batteries that much. The bulk of their money is made by selling disposable alkaline batteries that cannot be safely recharged. Therefore, their rechargeable batteries are very inferior compared to what you can get from a company that sells mainly rechargeable batteries.
Case in point. The capacity of small batteries, such as those in laptops and digital cameras, are rated something called in milliampere-hours (mAh). It is a technical term for how much electrical charge a particular battery will hold. A standard disposable D battery has a capacity of 12,000 mAh. By comparison a disposable AA battery will have between 1,300 and 2,900 mAh.
But, in some cases, rechargeable D batteries have significantly less capacity (as low as 1,800 mAh) because they are merely an AA battery wrapped inside a D battery shell. This is the case with the Energizer and Duracell brand rechargeable D batteries.
It’s interesting to note that a 4 pack of Energizer rechargeable AA batteries that are rated 2,450 mAh usually retails for about $10. But, a 2 pack of Energizer rechargeable D batteries that are rated only 2,200 mAh (less than the AA batteries) usually retails for about that same price. How does that make any sense? To me, that seems like a rip off.
That is why I bought the 8-pack of rechargeable D batteries from Tenergy’s website at all-battery.com. These rechargeable D batteries are rated 10,000 mAh, almost the same capacity of disposable D batteries.
These 8 batteries cost $50 ($6.25/each). For $50, I could have purchased about 50 disposable D batteries ($1/each). But, I believe these batteries will eventually pay for themselves.
The Tenergy D batteries can be recharged up to 1,000 times. Using the Universal Smart Fast Charger, it takes up to 12 hours to recharge up to 4 of these batteries. So, let’s do the comparison.
Alkaline Disposable D Batteries
COST PER BATTERY: $1
NUMBER OF USES: 1
COST PER USE = $1.
NiMh Rechargeable D Batteries
COST PER BATTERY: $6.25
NUMBER OF USES: 500 (estimated)
COST PER CHARGE: 5¢
COST PER USE = about 6¢
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