If the Helium Kit is out of stock or isn’t available yet, and you want a lighter battery for your Fliteboard without building the pack yourself, you still have a good option: get the Helium Enclosure and have a battery builder make the pack for you.
How it works
- Order the Helium Enclosure.
- Find a battery builder. There are a surprising number of custom lithium-ion battery builders who specialize in packs for things like this and for other electric ride-ons like electric bikes and Onewheels. We recommend Nelvick at DIY500AMP (opens in a new tab).
- Give them the specs below and tell them what the battery is for.
- The builder will help you choose the exact cells and cell count. Most builders will also finish the battery and deliver it completed, ready to go in your board.
What to tell the builder
- Configuration: 14S. 14S4P (56 cells) is the most popular size, and the builder will help you choose the exact cell count.
- Size: the pack has to fit inside 266 x 248 x 73 mm (10.47 x 9.76 x 2.87 in). Ask them to build it in a frame that fits tight against the edges of the case so it cannot move around inside, while leaving enough room near the front for the switch and vent, which stick out a little into the case.
- Current: cells, BMS and wiring rated for at least 120 amps. That is the most the Flitebox pulls before it cuts out.
- Cells: 21700 cells. Our first choice is the Tenpower 60XG. We also like the Great Power 60Q and the Reliance RS60, and the Reliance RS50 for colder climates. Avoid the EVE 50PL.
- BMS: we recommend the Daly Active 150A (opens in a new tab) (150A, 7S-17S option). Its key function runs the on and off switch, which needs to be a latching switch, not momentary.
- Main leads: long enough to reach the two Amphenol SurLok Plus connectors in the enclosure, with ring terminals for the M6 terminal studs.
If you finish it yourself
If your builder hands you just the pack, you mount the connectors, switch and pressure relief valve, drop the pack in, then seal the gasket and lid. Every step, with the parts we recommend, is in How to Assemble the Helium Enclosure.
What it costs
Start with the parts breakdown in our FAQ, How much will a complete battery cost?, then add the builder’s labor. Ask them for a quote.
Before you start
eFoil batteries store a lot of energy. Even with a professionally built pack, you are responsible for safe installation, charging, storage and use. Read our Battery Safety page first.
Want to know when the Helium Kit is back in stock? Join the waitlist on the Helium Kit page and we’ll email you.
Posterduck Customs LLC does not sell or guarantee third-party parts or battery packs. Posterduck Customs LLC is not affiliated with or endorsed by Fliteboard. Fliteboard and Flitebox are trademarks of their owner and are used here only to describe compatibility.