If I'm guesstimating right, the whole unit looks to be about 7 cm x 12 cm x 2cm. That gives me 168 cc total device volume (cartridge + fuel cell pack). Energy density, taking them at their word on 25 WH capacity, is then about 150 Wh/liter. That kind of stinks. I have a Kensington portable battery pack, which admittedly only has 9 Wh capacity, but is much smaller (about 53cc). Energy density of the Kensington is then a little higher, about 170 Wh/liter. Plus, the Kensington is rechargeable and I don't have to throw parts away or go to the store to buy more fuel to recharge it.
Also, I bet you there is a lithium-ion battery inside that big fuel cell unit to handle higher wattage output needed to charge many devices.
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If I'm guesstimating right, the whole unit looks to be about 7 cm x 12 cm x 2cm. That gives me 168 cc total device volume (cartridge + fuel cell pack). Energy density, taking them at their word on 25 WH capacity, is then about 150 Wh/liter. That kind of stinks. I have a Kensington portable battery pack, which admittedly only has 9 Wh capacity, but is much smaller (about 53cc). Energy density of the Kensington is then a little higher, about 170 Wh/liter. Plus, the Kensington is rechargeable and I don't have to throw parts away or go to the store to buy more fuel to recharge it.
Also, I bet you there is a lithium-ion battery inside that big fuel cell unit to handle higher wattage output needed to charge many devices.