Yoshino B330 SST Review
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Review By James Ndungu
- last updated 09/12/2026
The Yoshino B330 SST returns 207Wh of its 241Wh rated capacity, an 86% result, behind a 330W inverter, in a 9.9-pound chassis with solid-state cells rated at 4,000 cycles. Idle drain is 2.9% per hour. Budget price tier by sticker, premium by cost per watt-hour at $1.24.
My Quick Verdict
At 9.9 pounds, this is the lightest unit in our database, and the solid-state cells are the reason. That weight, with 4,000 rated cycles and near-silent operation, is a genuinely unusual package.
The idle drain undoes much of it. Seven watts of inverter overhead sounds small, but against a 241Wh pack, it works out at 2.9% per hour, which is the only figure of these five units to fail our 2% threshold.
Leave it switched on and doing nothing, and it empties itself in about 34 hours. That is a small-capacity problem rather than a poor inverter, but the effect on the owner is the same.
An 86% conversion rate returns 207Wh of the 241Wh rating, and the five-year warranty is among the best in our data. At $1.24 per watt-hour, it is also the most expensive energy on the site.
Best for: Backpack and travel use, where weight is the deciding factor, and the unit is switched off between uses.
Not for: Anything left armed for long periods, or anyone comparing on a cost-per-watt-hour basis.
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