# Lithium Ion Battery, 21700 Cell (3.7V 4500mAh, flat top)

**Type:** Product page · **SKU:** CE10659 · **Brand:** [Core Electronics](https://core-electronics.com.au/brands/core-electronics-australia)
**Page:** https://core-electronics.com.au/lithium-ion-battery-21700-4500mah-flat-top.html ([markdown](https://core-electronics.com.au/lithium-ion-battery-21700-4500mah-flat-top.html.md))

High-capacity cylindrical cells with the current headroom for UPS builds, robotics and custom packs.

## Pricing

- **Price:** $14.12 (inc GST) — $12.84 AUD, exc GST

## Availability & dispatch

- Out of stock — the product page offers email notification when it returns.

## Description

A big cylindrical lithium-ion cell that gives your project meaningfully more runtime than the 18650 it supersedes - 21mm across, 70mm long, and 4500mAh of nominal capacity in a format that drops into holders, sleds and battery sleds designed for the size.

We brought these in specifically to pair with [the Waveshare UPS HAT (E)](https://core-electronics.com.au/ups-hat-e-raspberry-pi.html) for Raspberry Pi.

Beyond the UPS HAT, the 21700 format suits any build that has outgrown an [18650 ](https://core-electronics.com.au/power-batteries/liion-lipoly/18650-cells.html)- robotics, LED lighting, field instruments, and DIY packs where you want fewer cells doing more work.

**Sold as a single cell. The Waveshare UPS HAT (E) requires four.**

### Features

- Around 30% more capacity than a typical 18650 in the same cylindrical format, so a four-cell pack carries meaningfully further between charges
- Flat-top terminals, as required by the Waveshare UPS HAT (E) and most 21700 holders
- 3C rated, giving headroom for high-drain applications rather than running the cell at its limit
- Standard 21700 dimensions, so it drops into off-the-shelf holders, sleds and pack hardware
 
### Specifications

 | Property | Specification |
|---|---|
| Format | 21700 cylindrical |
| Chemistry | Lithium-ion |
| Nominal capacity | 4500mAh |
| Nominal voltage | 3.7V |
| Maximum discharge | 3C |
| Dimensions | 21mm × 70mm |

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/c/e/ce10659-showcase.jpg)