Lithium batteries are expensive. That makes them a target for fakes. Here are eight signs to watch for.
1. The maths does not add up
Volts × amp-hours = watt-hours.
- 51.2V × 100Ah = 5,120Wh (about 5kWh)
- 51.2V × 200Ah = 10,240Wh (about 10kWh)
If a label says "48V 100Ah 10kWh", something is wrong.
2. It is too light
LiFePO4 cells are heavy. A 5kWh battery is usually about 40 to 50kg. If it feels like a box of air, be careful.
3. No datasheet
Every real battery has a datasheet. It lists capacity, cycles, BMS current and certifications.
4. No cell maker
Good batteries say who made the cells, such as CATL or EVE. If the seller says "Grade A" but cannot name the maker, be careful. Read Grade A vs Grade B cells.
5. Price far below others
If one battery costs much less than all others of the same size, ask why. Common answers: used cells, smaller real capacity or weak BMS.
6. No BMS details
Ask for the BMS current rating. It should match your inverter. See what a BMS is.
7. Vague warranty
"It has warranty" is not enough. Ask how many years or cycles, in writing, with a real address.
8. Wrong chemistry
Make sure it says LiFePO4. Read LiFePO4 vs NMC.
Quick checklist
| Check | Good sign |
|---|---|
| Volts × Ah = Wh | Matches the label |
| Weight | About right for size |
| Datasheet | Yes |
| Cell maker | Named |
| BMS rating | Stated |
| Warranty | Written, 5+ years |
