How many amps go through the usb output when charging cell phones? can it charge fast adaptively?

Given the size of battery. You will only get a emergency charge which is not long. It's not 5 amps that's for sure? more like 1 amp.

Here is my question. Thanks for your time. I tried to email the company and ask them about a new battery door. I have never heard from them. Is there anyway to get a replacement battery door? I took the battery out and the plastic door broke.

I would use black eletrical tape untill you can get one. that will be a hard spare you to get. --- Roy

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Killer Concepts Rocksteady XS Portable Bluetooth Stereo Speaker with Speakerphone (Black) VG2150-BT-A

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A great gadget for your digital life, the Killer Concepts RocksteadyXS portable Bluetooth speaker allows you to enjoy great music with full-range, dynamic sound, wirelessly from your smartphone, tablet, or other compatible devices. You can also enjoy hands-free calls with the built-in speakerphone. The Onboard USB port is capable of playing MP3 files directly from the USB drive. The rechargeable lithium-ion battery delivers more than 10 hours of playback for extended use, which means non-stop enjoyment during long trips.

Bluetooth 3.0 technologyOffers simple connection with compatible devices, including Apple iPod, iPhone, and iPad, most Android devices, and most Bluetooth-enabled tablets, computers, and MP3 players. The unit can connect up to two devices simultaneously, and remember up to four devices for easy re-connection.
Speakerphone FunctionAnswer the phone or hang up directly from Rocksteady XS.
3.5mm Line Input and USB PortThe 3.5mm audio input jack enables connection of other MP3 players and portable audio devices with use of a 3.5mm stereo audio cable (included) for listening to your music. The speaker will not dock or charge players through use by this method. The USB port plays MP3s on a USB drive.
Rechargeable Lithium-Ion BatteryAllows simultaneous playback and charging, and provides more than 10 hours of playback for extended listening.
Portable Design with Rugged CaseThe compact, sleek design makes it easy to take your speaker on the go, while the quality aluminum case enables long-lasting use.