Olympus BLH-1 Battery Cap / Charge Indicator

thingiverse

Now securely held in place by the innovative MicroFillets. Clearly asymmetrical in one plane, ensuring you can easily identify whether your battery is ready to go or in need of a charge. You're given the freedom to decide if the arrow's direction means it's time for a recharge or not. These summaries often contain a healthy dose of sarcasm, and that's exactly what you'd expect from a simple cap on a BLH-1 battery holder.