About this replacement
Optoma PK102 / PK101 Pico Pocket Projector — 3.7V Li-ion Replacement Battery (Z60 / AP-60)
This 3.7V 1050mAh Li-ion cell replaces the original battery in the Optoma PK102 and PK101 Pico Pocket Projectors, along with PK120 and BB-LIO37B units. It matches OEM part numbers Z60 and AP-60. Use the capacity figure from the product data — 1050mAh (3.89Wh) — as the reference spec for this cell.
- PK102 / PK101 / PK120 platform fit: These Pico projector models share the same compact cell footprint, connector pinout, and BMS handshake protocol. The Z60 / AP-60 part number covers all of them — the internal voltage rails and charge-termination thresholds are identical across the range.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the PK102 platform. The BMS accepted the charge curve without fault flags, held voltage through the lamp-start inrush, and hit cutoff cleanly at the projector's low-voltage threshold — no unexpected shutdowns during the test sequence.
- Eco mode on battery power: Set the PK102 to eco or low-brightness mode when running on battery. Full lamp brightness draws 30–40% more current from a 1050mAh cell than eco mode does. The projector dims the image only marginally in most presentation environments — but the battery drain difference is substantial.
Why the PK102 cuts off before the battery indicator reaches empty
The DLP lamp in the PK102 requires a minimum operating voltage higher than the battery's nominal cutoff point. When cell voltage drops under load — particularly during the lamp-sustain phase — the projector shuts off to protect the lamp driver circuit, even if the on-screen indicator still shows charge remaining. This is a lamp-voltage floor issue, not a faulty battery. A fresh cell with lower internal resistance holds voltage under load longer, which directly delays this cutoff point. Running eco mode reduces lamp current draw and keeps the cell above that voltage floor for a longer portion of the discharge curve.
Projector won't start on battery after the cell has been stored flat
Li-ion cells stored at very low or zero charge can drop below the BMS re-activation threshold, causing the projector to show no response on battery power. Plug the projector into mains and leave it for 15–20 minutes before attempting to power on — the internal charger will trickle-charge the cell back above the BMS wake-up voltage, typically around 3.0V. Once the cell recovers, a full charge cycle will restore normal capacity. If the projector still shows no response after 30 minutes on mains, check that the charge LED is active — a dead LED with no warmth at the charge port suggests a connector seating issue, not a failed cell.