This is the latest version---LF280K, with 6000 cycles Grade A.
In the same battery pack, we do not recommend mixing "N" series and "K" series.
1. About the battery:

(1) We ordered the batteries directly from EVE. Grade A, brand new, guaranteed sufficient capacity, and EVE has fully matched them according to our requirements.

(2) The original terminals of these batteries are laser welding points. For easier assembly, we has welded studs for them. Usually, the effective length of the stud is 11-15.5MM, if you have special requirements about that, please let we know.

(3) These batteries wth certificates, such as CE, MSDS, UN, UL, if you need them, please contact us.

(4) The price come with Bus bars and Bolts.The busbars size:90*20*2mm&hole distance: 70mm(cooper plated with nickel) Studs size: M6*6mm

2. About freight:

Please ignore the default shipping price on the website. We will calculate the specific shipping price based on different countries, different zip codes, different order weights, and different shipping methods.

3. About ordering:

(1) Please send us an inquiry through any product link in our store.

(2) After we discuss and confirm all details (including product price, shipping price, total price), we will draft this order.

(3) You could click on the order link we drafted and follow the system prompts to pay after verifying that all the information in the order is correct. (4) After we receive your payment, we will send you updates,such as test pictures and videos, tracking information. You just need to wait for the arrival of the order.

4. About payment:

(1) We accept credit cards, CC,paypal and T/T.

(2) If this is your first purchase in Alibaba, the system may require verification of your account.

5. If you need "General Basic guidelines for assembling LiFePO4, lithium iron phosphate (LFP) battery",please contact us .