Powerful Zoom H4n Lithium Polymer Rechargeable Gomadic Brand Battery Pack - High Capacity Portable C

• Very easy to operate. Simply connect Zoom H4n, press activation button on pack, and charging begins. Quick start guide included.
• Integrated circuitry tailors output voltage and charging current to exact specification of the Zoom H4n (accurate to 0.1v).
• Specification: Internal Battery (3400mAh lithium polymer), Input port (miniUSB), Output Port (Standard USB), Onboard Circuit Design (Zoom H4n Specific), Dimensions (4.0 X 2.0 X 0.5 inches), TipExchange enabled (Yes)
• Charging kit includes: Rechargeable Lithium Battery Pack, Coiled input/output cable (expandable to 24"), Zoom H4n Charging Connection, and Battery Pack input connection.
• Continue to use your Zoom H4n for hours OR recharge it on the go without being tethered to a wall outlet

If you ever tried to be on location all day and work with AA's you'll understand what a god send this battery is.

No more constant switching off to save batteries (and loosing recordings because the Zoom takes so long to power up!!!), or you swap batteries every 2-3 hours if you're lucky (most of the times it's less).

Once you work out that you have to press the batteries only button to activate it before starting the Zoom, you are running all day without switching the Zoom off at all. I tested continues recording and got over 12 hours.

Buy Powerful Zoom H4n Lithium Polymer Rechargeable Gomadic Brand Battery Pack - High Capacity Portable C Now

I shoot with the Rode NTG 2 or 3, can't remember, it's been in the zeppelin so long. I run phantom power from my Zoom H4Ns AA batteries or AC adapter and that as you know drains AA batteries like crazy. So I found this Gomadic. For about the same budget as my AA consumption for a 12 day shoot, I could take a chance on this battery pack to power my Zoom and Mic. I couldn't find any real estimate for how long one charge would last for my use. That's why I'm writing this review to say, this is an amazing piece of essential gear which will save you tons of money. It arrived charged. So I plugged it in and topped it off. There are 5 battery indicator lights to let you know what the charge status is. So with a full charge I shot all day long. Even when not recording, I left the Gomadic on. I wanted to get a sense of the life of a charge. I shot from 9AM to 9PM and I lost only 1 tick from my 5 ticks of charge. So let's estimate in 12 hours I used only 20% of the battery. I love this Gomadic. I highly recommend getting the package with the curly cord and the adapter tip for the Zoom, all packaged together. It processed and shipped fast.