[ClockFace + Layout] Custom clock: battery drain

I updated the renderTopBar() method to draw the "widgets" only if its value has been changed but there's something wrong. Last night battery drop from 70% to 30% :-(

let prevLocked = undefined;
let prevConnected = undefined;

function renderTopBar() {
    const itemW = 10;
    const itemH = 2;

    let locked = Bangle.isLocked();
    if (locked != prevLocked) {
      const lockColor = locked ? g.theme.fg : g.theme.bg;
      g.setColor(lockColor).fillRect(0, 0, itemW, itemH).setColor(g.theme.fg);
      prevLocked = locked;
    }

    let connected = NRF.getSecurityStatus().connected;
    if (connected != prevConnected) {
      const bluetoothColor = connected ? (g.theme.dark ? "#0ff" : "#00f") : (g.theme.dark ? "#666" : "#999");
      g.setColor(bluetoothColor).fillRect(item­W + 1, 0, 1 + itemW * 2, itemH).setColor(g.theme.fg);
      prevConnected = connected;
    }
}

Bangle.on("lock", b => {
    renderTopBar();
});
NRF.on("connect", () => {
    renderTopBar();
});
NRF.on("disconnect", () => {
    renderTopBar();
});

Am I missing anything else?