JBL Tune 115BT In-ear headphones The JBL Tune 115BT In-ear headphones have a recommended retail price of 5500 shillings in Kenya. They feature JBL Pure Bass Sound and an up to 8-hour battery life with a speed charge. For the price that these sell for they should be a no-brainer. Battery life The question mostly asked usually is, “How do I charge my JBL tune 115bt?” Well, it is advised to use the supplied micro-USB charging cable, which came with the headphones. You will also need a USB charger from your smartphone or a regular USB port of a computer. Carefully remove the dust cap on the remote control of the headphones. Under there is the micro-USB port to charge the battery.