Olympus

Modified firmware, video duration limit removed:

https://www.mu-43.com/threads/modified-firmware-looking-for-users.99804/

Battery:

Olympus BLS-50: Olympus OM-D E-M10, E-M10 Mark II, E-M10 Mark III, Olympus PEN E-P3, E-PL3, E-PM1, E-P1, E-P2, E-PL1, E-PL6, E-PL5, E-PL2, E-PM2, E-PL8, E-PL7 Olympus Stylus 1

Battery grip:

Olympus HLD-1: Olympus CAMEDIA E-10, Olympus CAMEDIA E-20N

Olympus HLD-2: Olympus E-1

Olympus HLD-3: Olympus E-300

Olympus HLD-5: Olympus E-620

Olympus HLD-6: Olympus OM‑D E‑M5 Mark I

Olympus HLD-7: Olympus OM‑D E‑M1 Mark I

Olympus HLD-8: Olympus OM‑D E‑M5 Mark II

Olympus HLD-9: Olympus OM‑D E‑M1 Mark II