Phillips Speaker

Philips Fidelio SoundAvia Wireless Speaker - AD7000W/37

Objective

The sound from this speaker is amazing and I wanted something more portable with great sound. So, a few years back I wired in a USB bluetooth receiver and added lithium ion batteries to this speaker to make it portable and bluetooth enabled. 

I ended up powering it with a 2S2P battery pack for a power output of around 3.7v x2  ~= 7.4v 

After using this for a couple of years, I noticed that sometimes the bluetooth would not connect. My current theory is that the voltage eventually gets too low to power the USB. I think this is because I opted to to power it with only 7.4 volts.

I think it is time to update this speaker with a 3S2P battery pack for a voltage of about 11.1v which should give it the longevity it deserves. The upper voltage would be 12.6v while the low voltage would be 6v.

Power Consumption

Bluetooth Module

• 【Upgraded Bluetooth Adapter】: High Bluetooth V5.0 makes your non-Bluetooth devices Bluetooth-Enabled, easily transmit audio wirelessly. It's compatible with a variety of Bluetooth devices.
• 【Low Delay】: With aptX lantency technology, this adapter provides fast, stable and smooth transmision without audio delay. You will get a rich and clear sound experience and enjoy comfortable audio-video synchronization.
• 【2-in-1 Function】: Transmitter Mode: Plug into your non-Bluetooth device like TV, PC, CD player, MP3/MP4 and pair to your Bluetooth speakers and headphones. Receiver Mode: Plug into your non-Bluetooth Home/Vehicle Sound Systems and pair to your smart phone.
• 【Plug & Play】: Mini Bluetooth adapter, no need any drivers, plug in the USB port to use. One-button switching mode, red light for transmitting mode, blue light for receiver mode.
• 【USB Power Supply】: Charge it on the USB port, never worry about running out of power when you use it. Enjoy 1 year warranty.

I confirmed that the last mode is preserved after powering off/on.

Current Pictures

Revision

The biggest problem with updating the battery will be space but we CAN DO IT!

Battery Build

We are building a 3S2P 11.1V (12.6v Max) Lithium Ion battery. 

Testing shows a capacity of 3.20Ah or 33.77Wh. 

The BMS has the following specifications:

Question: Can we safely charge this with our 14.6v 20A Charger?

Answer: No, charger toggles between charge and standby and battery shows 13+ volts.

Perhaps we can add a voltage regulator?

Installation

And voila, all done and running on battery and it sounds amazing!

References