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Help Guide | Charging the battery pack while it is inserted in the camera
Charging the Battery
Amazon.com: Nitecore UNK1 Digital USB Camera Charger for Nikon Batteries EN-EL14, EN-EL14a, & EN-EL15 - Compatible with Nikon Coolpix, 1V1, P, & D Series : Electronics
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NJA Power Dual Camera Battery Charger MH-26 For Nikon D5 D4 D4S EN-EL18 EN-EL4A EL4 Canon 1D IV 1Ds III LP-E19 LP-E4 LP-E4N | NJ Accessory/Buy Direct & Save
The light won't stop blinking even I've already charge it for 4hours : r/ Nikon