 "GoPro Hero Extended Battery Pack 4000mAh Epic L40GH - NOT COMPATIBLE with 4, 3/3+" 4 3/3+ Limefuel"
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Over 3.5x more juice than original battery.
Film upwards of 8 hours on a single charge.
4000mAh battery charges with included micro USB cable.
Protection against short circuit, anti-discharge protection, anti-overcurrent protection and anti-explosion protections.
Includes extended back housing, waterproof up to 40 meters
Compatible with HERO (2014) entry-level camera only. NOT COMPATIBLE with Hero+, Hero+ LCD, Hero (2010), Hero 2, Hero 3/3+ or Hero 4 cameras.

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 "GoPro Dual - battery charger USB" " GoPro USB AHBBP301 Digital Camera Accessories CDWG.com
"Conveniently charge two GoPro Li-ion batteries simultaneously with the dual battery charger. Featuring USB compatibility, you can power it with most standard USB chargers, the GoPro wall or auto charger or a computer. Dual LED indicator lights display the charging status of both batteries: in process (amber) and fully charged (green)." 