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We will send the chargers and batteries. You can charge the battery with the charger we send to you. The CR2, CR123A, 16340, 18650 are rechargeable while the AAA batteries are not. Charge the batteries when the laser beam gets dimmer. Most of the batteries need 2 hours charging. When it's fully charged, the indicator lights will turn to green. Don't worry about long time charge, the charge will protect the batteries.

Make sure that the + and - symbols are correctly matched up. Most of the lasers need to insert with the positive pole of the batteries outside and the negative pole inside, especailly when it's the infrared 808nm 400mW laser. 
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