Tattu (Marke von Grepow) Semi-solid State 350Wh/kg 33000mAh 10C 22.2V 6S1P G-Tech
Series: Tattu (Marke von Grepow) Batteries for drones
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The Tattu Semi-solid State 350Wh/kg 33000mAh 10C 22.2V 6S1P G-Tech is a semi-solid lithium battery from Tattu, a Grepow brand, for mid-size multicopters. Six cells in series give a nominal 22.2 V at 33 Ah; the connector is an XT90-S, and the G-Tech balance plug suits Tattu chargers.
22.2 V and 33 Ah give 732.6 Wh. The weight is between 2,216 g and 2,355 g depending on the source; at 2,355 g that is about 311 Wh/kg at pack level, at 2,216 g about 331. 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), which matches the constant discharge current of the maker's table, and about 2.2 kW.
732.6 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 2.2 to 2.4 kg the pack weighs heavily in the take-off mass on which the EU classes are drawn; in an aircraft of class C2 (below 4 kg) it would be a very large share.
In selection the balance plug counts: the G-Tech form suits Tattu chargers, and with chargers from other makers the plug shape should be checked beforehand. The continuous current of 99 A must cover the hover current with reserve; an XT90-S is rated for about 90 A continuous and works at its limit at 99 A. Wear shows as lost cycles, growing voltage sag and deformed cells; the six cell voltages are checked at the 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) | 6Scorrect |
| Connector | XT90-Scorrect |
| Energy density (Wh/kg) | 350correct |
| Form factor | Packcorrect |
| Nominal voltage (V) | 22.2correct |
| Weight (g) | 2,355correct |
What to check before buying
- Check the hour meter against the service records — a replaced instrument is the most common gap.
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