리튬 이온 21700 전기

Li-ion 21700 電池是一種高效能的可充電鋰離子電池，其名稱源於標準化的尺寸：直徑 21 毫米，高度 70 毫米。這款電池的設計旨在提供比傳統 18650 電池更高的能量密度和容量。

規格與特性

• 尺寸: 直徑 21 毫米，長度 70 毫米。
• 標稱電壓: 通常為 3.6V 或 3.7V。
• 充電截止電壓: 充滿電時約為 4.2V。
• 容量: 根據不同的化學成分和製造商，容量範圍通常從 3000mAh 到超過 5000mAh。
• 能量密度: 由於尺寸較大，21700 電池具有更高的能量儲存能力，能量密度介於 250 Wh/kg 到 300 Wh/kg 之間。

Returns Policy

You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).

You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).

If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.

Shipping

We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.

When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.

Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.

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