FOR IMMEDIATE RELEASE

The Question Wiltson Energy Heard Most at ees Europe 2026: "It Charges Below Freezing?"

After three days in Munich, the cold-charging message landed where the company expected it to — not in the Arctic, but in the ordinary temperate winter.

MUNICH, Germany, 26 June 2026 — Wiltson Energy closed out ees Europe 2026 (Messe München, 23–25 June, part of The smarter E Europe) at Stand B0.244, where its 25.6V (24V-class) low-temperature LiFePO4 pack drew steady traffic from installers and OEMs working cold-climate, off-grid sites. The most common reaction at the stand was a double take at one line on the datasheet: the pack keeps charging when cell temperature is below 0 °C, down to −30 °C, with no pre-heating module.

That reaction was the point. Most standard graphite-anode lithium packs stop accepting charge once cell temperature drops below freezing. Through a Northern European winter — 30 to 45 frost days in Germany, 60 to 80 across much of Scandinavia — an unheated pack can sit below 0 °C through the charging window and accept nothing until something warms it. Across three days of conversations, the engineers and buyers who stopped by kept returning to the same scenario: not −40 °C in the far north, but the −5 °C morning on an ordinary site where the panels are producing and the battery will not take the power.

"We went in expecting to talk about extreme numbers, and we ended up talking about ordinary winters," said Ethan Jin, a senior executive at Wiltson Energy. "Visitor after visitor described the same problem — a heater bolted on just to start charging on a normal cold morning, spending the very energy the site is trying to harvest, and one more part that fails on an unattended site. When we said the cell takes charge below freezing and the heater comes out, that's where the conversation got serious."

What landed at the stand

The repositioning the company brought to Munich — leading with the 0 °C charge limit rather than the −30 °C rating — matched how buyers framed their own pain. The 0 °C limit is an industry problem, not a Wiltson one: charge a conventional graphite-anode cell below freezing and metallic lithium can plate on the anode, more so at higher current, so battery management systems block charge current while the pack stays below its low-temperature limit. Wiltson's cells are specified to take charge current below freezing, so the BMS allows charging down to −30 °C with the rate managed by temperature — the full 6.4A above 0 °C, half that down to −20 °C, and a fifth of it in the deepest cold near −30 °C. It charges at a lower rate in deep cold, a real trade-off, but it charges, where many standard packs accept none.

Interest clustered around the segments the pack is built for: off-grid solar and storage, telecom and monitoring stations, outdoor sensor networks, and security enclosures — unheated, hard-to-reach sites where a winter service call is the expensive failure. Several conversations centered on the −30 °C rating as headroom rather than a threshold: margin for the −5 °C or −10 °C an ordinary winter actually delivers, not a polar spec sheet.

What customers asked to take away

The most frequent follow-up request was for datasheets and evaluation samples to put through a buyer's own cold-chamber and field testing — which the company encouraged, since the cold-charging claim is one engineers can verify directly. The pack carries the CE mark, with EMC and electrical-safety test reports, and is certified to IEC 62133-2 under the CB Scheme. It has passed UN 38.3 transport testing, and documentation is available for the EU Batteries Regulation (EU) 2023/1542, RoHS, REACH (Annex XVII), and the POPs Regulation. It has also been tested to GJB 4477-2002, a Chinese military standard for lithium battery packs.

Specifications: 25.6V nominal · 6.4Ah (≈164Wh) · 16–29.2V operating window (BMS-controlled cutoff) · charges from −30 °C to 60 °C (temperature-managed rate) · discharge −40 °C to 60 °C, 90% capacity at −40 °C (specified low-temperature discharge test) · 10A maximum discharge · 2,000 cycles at 25 °C / 1,000 cycles under specified sub-zero conditions · PVC housing · 138 × 98 × 80 mm · 1.6 kg.

Samples and datasheets remain available on request for teams that did not reach the stand. Wiltson Energy thanks everyone who visited Stand B0.244 and the organizers of The smarter E Europe.

Media contact: Daniel Fan, PR Manager · [email protected] · wiltsonenergy.com