Tattu (Marke von Grepow) Semi-solid State 350Wh/kg 33000mAh 10C 51.8V 14S1P
Series: Tattu (Marke von Grepow) Batteries for drones
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The Tattu Semi-solid State 350Wh/kg 33000mAh 10C 51.8V 14S1P is a semi-solid lithium battery from Tattu, a Grepow brand, for heavy multicopters. Fourteen cells in series give a nominal 51.8 V at 33 Ah; the connector is an AS150U-F.
51.8 V and 33 Ah give 1,709.4 Wh. The weight is between 5,183 g and 5,486.5 g depending on the source; at 5,486.5 g that is about 312 Wh/kg at pack level, at 5,183 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), about 5.1 kW. The maker quotes more than 500 cycles to 90 per cent residual capacity.
1,709.4 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; UN 38.3 testing is the precondition, and airline rules may be stricter. At just over 5 kg the pack belongs in aircraft of classes C3 and C4 (below 25 kg) or heavier.
The cycle figure is a maker value and depends on discharge current, depth of discharge and temperature; it makes the pack interesting for continuous use but does not replace ongoing checks. One checks the fourteen cell voltages at the 15-pin balance lead, the voltage sag under load and any deformation of the cells. The continuous current of 99 A must cover the hover current with reserve, and the AS150U-F leaves room for that. 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) | 14Scorrect |
| Connector | AS150U-Fcorrect |
| Energy (Wh) | 1,709.4correct |
| Energy density (Wh/kg) | 350correct |
| Form factor | Packcorrect |
| Nominal voltage (V) | 51.8correct |
| Weight (g) | 5,486.5correct |
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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