I agree with the above comments to go with NiMH rechargeable batteries instead of trying to use alkaline cells. The NiMH cells will give you like-new performance over hundreds of charge cycles. The ones advertised as low self-discharge or 'pre-charged' are the Eneloop type and are best for use in devices that might end up lying around for a month or more sometimes - but they have a little less capacity per charge compared to regular NiMH cells.

Yes, alkalines can frequently be recharged, but their capacity per charge drops off rapidly so the number of charge cycles is very limited especially if you ever run them down too far. You also run a risk of leakage since they aren't designed to be recharged and a leaking battery could easily destroy the device that it's powering.