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All answers having "Battery type" as clue:

3 Character Answers:

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AAA



5 Character Answers:

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CCELL

DCELL

NICAD

SOLAR



6 Character Answers:

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AACELL



7 Character Answers:

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DRYCELL

WETCELL



8 Character Answers:

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ACIDCELL

ALKALINE



9 Character Answers:

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SOLARCELL