Made of aerospace aluminum and black anodized, the new battery extension for the TILO is durable and scratch-resistant. If this is screwed to the TILO instead of the normal battery cap, either two normal batteries or an extended battery, e.g. TILO Rechargeable Battery can be used. Thus, the operating time of TILO can more than double to 6-7h. Fits all TILO models except TILO-3Z ™.