Battery Recharger (A3032)

© 2017 Kevan Hashemi, Open Source Instruments Inc.




The Battery Recharger (A3033) is a LWDAQ device that recharges implantable devices equipped with rechargeable batteries, such as the Subcutaneous Transmitter (A3028B-R) or Imlantable Sensor with Lamp (A3030E). Two bananna jacks on the A3033 enclosure allow us to connect the recharging leads of the implantable device with alligator clips or miniature sockets, depending upon the electrodes present on the ends of these leads. Subcutaneous Transmitter devices recharge therough their EEG leads, which come with a wide variety of electrodes. Implantable Sensor with Lamp devices recharge through their lamp leads, which are equipped with gold-plated contact pins.

Because the recharging takes place through the device leads, the recharger must determine the battery voltage by varying the recharging current. This process is managed by the Battery Recharger program that runs within the LWDAQ Software. The Battery Recharger program operates the A3033 through a LWDAQ System to which the A3033 is connected. If you are using our implantable devices, you already have a LWDAQ system, consisting of a black box that is the LWDAQ Driver, and some kind of data receiver for biometric recording. The A3033 simply plugs into the LWDAQ Driver with its own LWDAQ root cable.

In order to avoid charging batteries too rapidly, the Battery Recharger program must know what kind of battery you are connecting. Select your device from the device type drop-down menu. Each A3033 recharges only one battery at a time. Recharge time is two hours, so you can recharge an entire set of ten devices in a couple of days. Recharging a batch of transmitters would be faster if the A3033 provided multiple charging ports. According to our calculations, however, having multiple ports introduces the possibility of configuring the charger incorrectly and damaging a rechargeable device, which is an expensive loss. Our objective is reliable recharging, and the A3033 single-battery recharger provides reliability. Even if the user selects the wrong device type, the Battery Recharger software will detect over-rapid charging of the battery within a few minutes, which will lessen the damage done to the lithium-polymer cell.