We can judge whether it is Grade A or Grade B cell from below forctors: A:Appearance Grade A battery was produced with a unique QR code as a proof of identity. Which also makes it more convenient for the manufacturers to offer after-sale services. And as we mentioned in the last post, Grade B cells are categorized as unqualified ones. B: Dimension&Weight As dimension&weight will be slightly different at different SOC percentage, it would be necessary for you to confirm with the supplier of their testing SOC percentage. And compare the measured value with the one they offered on the datasheet. C:Capacity If your testing capacity is a little bit higher than the datasheet. If only there aren’t too many differences. That will be alright. D:Self-discharge Rate The self-discharge rate differs at different SOC state. For example, the voltage decrease quicker at 100% SOC than at 50% SOC. So before testing the self-discharge rate, check the battery specification about the testing SOC state first. E:Capacity recovery To test the capacity recovery rate, you just do a 100% DOD charging and discharging cycle. And check if the capacity recovery rate meets the datasheet. For example, for a 3.2v 100ah battery cell, if the recovery rate is 95%. We have tested the capacity at the beginning. It is 100ah. Then after all the tests, we do a 100% DOD charging and discharging. Then the capacity should be more than 95ah. If yes, the battery capacity recovery rate meets the datasheet. It's Grade A quality cell. Conclusion What we are doing is to compare the testing data with the specification of the cells. So we can trust the datasheet or supplier. After all the tests and comparison, if all the data meet the specification or datasheet, it is Grade A cells. If not, it is grade B cells.
Yes,We have a quality control laboratory, we have 100% test before delivery.
To receive the quickest and most successful troubleshooting, we suggest sending an email including: ● A detailed synopsis of the issue, ● Images of the problem during it's occurence, ● Specifics to your PV System, ● Be Sure to Include Images of: ● Wide shot of overall system installation ● Main Panel and Sub panels ● How AC input and output are connected to inverter ● How PV is connected to inverter ● Picture of White information Panel showing the Serial number & MPN ● How Batteries are connected to inverter ● Please take pictures of voltmeter readings from terminals on inverter (and what terminals you are testing): ● PV voltmeter readings ● Battery DC readings ● AC output readings ● AC input readings
For samples, the lead time is about 10-15 days. For mass production, the lead time is 25-35 days after receiving the deposit payment. The lead times become effective when (1) we have received your deposit, and (2) we have your final approval for your products. If our lead times do not work with your deadline, please go over your requirements with your sale. In all cases we will try to accommodate your needs.
Our prices are subject to change depending on supply and other market factors. We will send you an updated price list after your company contact us for further information.
You can make the payment to our bank account, or PayPal: 30% deposit in advance, 70% balance before shipment
Warranty time:5 years.
Yes, we require all international orders to have an ongoing minimum order quantity. If you are looking to resell but in much smaller quantities, we recommend you check out our website.