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The only issue I can see with rechargeable batteries is their quality. A lot of them are made in China do not seem to be consistent in their output. If you have one dud in a group, the whole group will fail more quickly. Don't see any reason why you couldn't use them as long as you check them with a meter first. Deereguy ran a test on his and got better results than what you are reporting. You might want to ask him about it.