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AA body is suitable for single AA or 17500. It can use a battery 50mm long with 17mm diameter. With out adapter, one AA will be a little loose but still useable.
With one AA, use a LED drop-in, the input is 0.8-4.2v so one AA is supported, current on LED end is about 250mA, single mode.
With 4.2v 17500, bulb drop-in with 3.7v bulb or LED drop-in are both useable.
AA body is suitable for single AA or 17500. It can use a battery 50mm long with 17mm diameter. With out adapter, one AA will be a little loose but still useable.
With one AA, use a LED drop-in, the input is 0.8-4.2v so one AA is supported, current on LED end is about 250mA, single mode.
With 4.2v 17500, bulb drop-in with 3.7v bulb or LED drop-in are both useable.