Recently, I bought a pack of 2 AA Eneloop rechargeable batteries to power my wireless mouse. As any wireless optical mouse user knows, batteries don’t last too long in mice — 3 months if you’re a lightweight, 1 1/2 months if you spend a lot of time on your computer. Therefore, buying a rechargeable battery seems to be a good investment as it has the advantage of being more cost-efficient over the long term.

So, what I like about Eneloop?

1. Immediate Use
   You can use it right after you unwrap the batteries.
2. Low self discharge
   Once charges, eneloop will lose only about 15% of their charge after a year of non-use.

   

3. Can be charged 10 100 1000 times!
   The retail price for a pack of 2 AA alkaline batteries and a pack of 2 AA Eneloop rechargeable batteries is RM 6 and RM 38 respectively. So, assuming that the Eneloop batteries can last only a quarter of what Sanyo claims (250 times) , I save RM 1462 (RM 6 x 250 - RM 38).

   Oh! Another important equation:
   Rechargeable battery = Environment Friendly

4. The cool packaging
   
   

You can read more about Eneloop here.

Popularity: 25% [?]