Q1: What is your terms of payment? A: We accept T/T, L/C for big amount,PayPal, Western Union, Small-amount payment Q2: How's the delivery time ? A:It will take about two weeks for production usually. Q3: How about the standard of package? A: For the small capacity, it use carton, but for big capacity, we should use strong wooden case for protection. Q4: Can you print my logo on the battery cover? A: Yes, OEM is available,we can print your logo on the battery case, and you can offer your logo. Q5: How to maintain the battery? A:The battery should be stored in clean, dry, ventilated, dark environment when not using, keep it after full charge, recharge it every 3 months or 6 months. Q6: How can you tell if a battery is good or bad? A: You should first check the battery for defects such as a broken circuit, a short, or a broken container.If an outward problem is not apparent, then you will have to check the battery's capacity using known measuring techniques to ascertain the problem.