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i use hybrid rechargeable batteries the main reason for using this type of battery is because i don't use flash that often and hybrids hold there charge for up to a year without use so on the occasions i use flash the batteries should be charged
ni cad nimh batteries have a natural discharge rate regardless of usage in other words if you leave them for a month the chances are they will be flat hybrid batteries can hold 80% of there charge over a 12 month period and can be charged 100s of times
i think lithium batteries are still too expensive for a one time use battery
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