Tattu (Marke von Grepow) 33000mAh 12S 10C 44.4V Semi-solid (350Wh/kg)
Series: Tattu (Marke von Grepow) Batteries for drones
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The Tattu 33000mAh 12S 10C 44.4V Semi-solid (350Wh/kg) is a semi-solid lithium battery from Tattu, a Grepow brand, for heavy multicopters. Twelve 4.2 V cells in series (part number TARBG3533K12S10X) give a nominal 44.4 V at 33 Ah; the connector is an AS150U-F.
44.4 V and 33 Ah give 1,465.2 Wh. The weight is between 4,443 g and 4,686 g depending on the source; at 4,686 g that is 313 Wh/kg at pack level, at 4,443 g about 330. The name quotes 350 Wh/kg and so lies above both pack values; the calculated one is decisive. The continuous current is 99 A (3C), and the peak is 10C (330 A) for less than 3 seconds.
1,465.2 Wh is far above 160 Wh. Under the IATA passenger leaflet (February 2019 edition) the pack travels only as dangerous-goods cargo, not as a spare in hand baggage; every shipment requires UN 38.3 testing. At 4.4 to 4.7 kg the pack alone exceeds the 4 kg of EU class C2 and belongs in aircraft of classes C3 and C4 (below 25 kg) or heavier.
When buying, the version must be checked: the same capacity and cell count is also offered with 4.45 V cells (UHV), and the two versions differ in nominal voltage, full-charge voltage and energy. The continuous current of 99 A must cover the hover current with reserve; the AS150U-F is made for currents around 150 A. Wear shows as lost cycles, growing voltage sag and deformed cells; the twelve cell voltages are checked at the 13-pin balance lead. Storage is in the middle of the charge range as the maker specifies.
Technical data
Other data
| C-rate | 3correct |
|---|---|
| Capacity (mAh) | 33,000correct |
| Cell chemistry | Halbfest LiPocorrect |
| Cell count (S) | 12Scorrect |
| Connector | AS150U-Fcorrect |
| Energy (Wh) | 1,465.2correct |
| Energy density (Wh/kg) | 350correct |
| Form factor | Packcorrect |
| Nominal voltage (V) | 44.4correct |
| Weight (g) | 4,686correct |
What to check before buying
- Check the hour meter against the service records — a replaced instrument is the most common gap.
- Compare the data plate and chassis number with the papers.
- Ask about parts availability for this build year — the running costs hang on it.
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