The Block Battery alternative to the IDX E-HL9 V-Mount Lithium Ion High Load Battery

V-Mount high load batteries are compatible with a wide range of professional cinema and broadcast cameras including Sony FX9, Sony CineAlta series, RED cameras, Canon EOS C400, and Arri Alexa systems. They can also power accessories and LED lighting panels that accept 14V or 28V input via V-Lock or B-Mount eliminator plates.

V-Mount (V-Lock) batteries use a trapezoidal locking interface common on Sony and many third-party cameras. B-Mount is a heavier-duty standard used on larger cinema rigs, offering a more secure mechanical connection. Some batteries, like Block Battery's SLi series, support both V-Mount and B-Mount via interchangeable plates, making them highly versatile across production workflows.

Yes, certain V-Mount batteries are travel-compliant when they can be disassembled into units under 100Wh. For example, The Protean splits into two isolated 75Wh batteries for carry-on compliance. The SLi-D600 and SLi-D1000 are also disassemblable to meet airline lithium battery regulations. Always verify current airline and TSA guidelines before travel.

'High load' refers to the battery's ability to deliver sustained power to equipment drawing significant wattage — typically 150W to 250W continuously. This is critical for powering large LED lights, high-draw cinema cameras, and multiple accessories simultaneously without voltage sag, overheating, or premature shutdown during demanding production scenarios.

Runtime depends on the battery's Wh capacity and the connected load. A 304Wh battery like the SLi-300 provides over two hours for most cinema cameras at moderate draw. Higher-capacity units like the SLi-D1000 (970Wh) can power cameras and accessories for an entire shooting day. Linking multiple batteries further extends available runtime.

V-Mount cinema batteries commonly output 14.4V for standard camera and accessory use. Dual-voltage models like the SLi-D600 and SLi-D1000 provide both nominal 16V DC and regulated 28V DC simultaneously. Multi-voltage systems such as the SLi-1000 and INDY 5000 extend support to 24V, 28.8V, and 30V for high-voltage cinema and lighting demands.