3) Generally speaking (you can get higher rated ones) rechargeable batteries only last about half as long as standard alkaline battery. |
4) Energizer e2 Photo Lithium batteries tend to last the longest for me. However, they are more expensive and when they finally start to go, have another on hand because they drain quickly at that point.
Just to point out to those people who might be confused by this -- This only applies to the RIM 850 and 950 which used an AA battery -- all the newer Blackberries use rechargeables, and uses lithium-ion which are usually superior to alkaline nowadays.