> **Source:** Core Electronics is an Australian maker-electronics retailer and manufacturer based in Newcastle, NSW, run by a team of makers and educators. We design and manufacture our own product lines (PiicoDev, CE originals) and are official retailers for iconic maker and industrial brands including Raspberry Pi, Arduino, Adafruit, SparkFun and DFRobot. Orders ship Australia-wide from our Newcastle warehouse. Prices are in AUD and include GST. Pricing, stock and dispatch on this page are generated from the store's live catalog. Full machine-readable index: https://core-electronics.com.au/llms.txt

# 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.

## How to buy

- **Build a cart:** compose `https://core-electronics.com.au/cart/link?items=CE10659:1` (comma-separated SKU:qty pairs) and share the link. Opening it shows a confirmation page with live pricing and stock before anything is added to the cart.
- **Verify the cart first:** fetch `https://core-electronics.com.au/cart/link/CE10659:1.md` for live line prices (inc & exc GST, quantity discounts applied), stock and dispatch estimates, and totals. Append `/to/{AU-postcode}` (or `/to/{country-code}:{postcode}`) before `.md` for delivery options and prices to that destination. Unknown, retired, or out-of-stock SKUs are flagged. (Query form `cart/link.md?items=...` also works but some robots parsers refuse query strings here.)
- **Checkout** is completed on-site and includes a captcha at the payment step. Share the cart link; checkout takes it from there.
- **Search the catalogue:** `https://core-electronics.com.au/search/{query}.md` (URL-encode the query; pages 2-3 at `search/{query}/{page}.md`; `search.md?q=` also works)
- **Payment methods, purchase orders, policies and contact details:** https://core-electronics.com.au/llms.txt
## 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)