# Molicel INR-21700-P45B

> Molicel INR-21700-P45B is an unprotected 21700 lithium-ion power cell with 4.5 Ah typical capacity, 3.6 V nominal voltage and 45 A continuous discharge at an 80 C cut-off. It supports 4.2 V charging, measures 21.55 mm maximum diameter by 70.15 mm maximum height, and weighs 70 g maximum.

- Manufacturer: Molicel
- Part number: INR-21700-P45B
- Category: Batteries
- Canonical page: https://www.xirkit.io/products/molicel-inr-21700-p45b-5c23
- Pinout: https://www.xirkit.io/products/molicel-inr-21700-p45b-5c23/pinout
- Structured JSON: https://www.xirkit.io/products/molicel-inr-21700-p45b-5c23/data.json
- Source: Xirkit structured parts catalog — every value traced to a cited document; unknowns are explicit.

## Key specifications

| Property | Value |
| --- | --- |
| Chemistry | li-ion |
| Form factor | cylindrical 21700 |
| Configuration | 1S1P |
| Nominal voltage | 3.6 V |
| Charge voltage | 4.2 V |
| Cut-off voltage | 2.5 V |
| Capacity | 4,500 mAh |
| Minimum capacity | 4,300 mAh |
| Energy | 16.2 Wh |
| Max continuous discharge | 45 A |
| Standard charge current | 4.5 A |
| Max charge current | 13.5 A |
| Protection circuit | none |
| Dimensions | 21.55 × 21.55 × 70.15 mm |
| Operating temperature | -40 to 60 °C |

## Pinout (2 pins, 0 with electrical limits)

| Pin | Position | Kind | Chip pad | Functions | VIH | VIL | VOH | VOL | IOH | IOL | 5 V tolerant |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| positive | — | positive | — | positive | — | — | — | — | — | — | — |
| negative | — | negative | — | negative | — | — | — | — | — | — | — |

## Where to buy

| Supplier | Price | Stock | Checked | URL |
| --- | --- | --- | --- | --- |
| www.18650batterystore.com | 6.99 USD | out_of_stock | 2026-09-29 | https://www.18650batterystore.com/products/molicel-p45b |

## FAQ

**What voltage powers the Molicel INR-21700-P45B?**

Supply range 2.5–4.2 V.

**How much does the Molicel INR-21700-P45B cost?**

From $6.99 at www.18650batterystore.com. Prices are observed unit prices before tax and shipping.

**What are the Molicel INR-21700-P45B dimensions?**

21.55 × 21.55 × 70.15 mm. A STEP model is available for enclosure fit checks.

**Where does this Molicel INR-21700-P45B data come from?**

Every value in this record is traced to a source — 2 documents including the board and chip datasheets — with the page and table cited per value. Unknowns are left explicit, never guessed.

## Sources

- [Molicel INR-21700-P45B datasheet](https://www.molicel.com/wp-content/uploads/INR21700P45B_1.4_Product-Data-Sheet-of-INR-21700-P45B-80109.pdf)
- [www.18650batterystore.com listing](https://www.18650batterystore.com/products/molicel-p45b)

## Part graph

### Alternatives (by use case)

- [PKCELL 18650 Li-ion 3.7 V 2200 mAh (PCM)](https://www.xirkit.io/products/pkcell-18650-li-ion-3-7-v-2200-mah-pcm-2b9c) — Both serve battery-powered and portable builds — check the trade-offs; $6.99 vs $9.95
- [PKCELL LiPo 3.7 V 2000 mAh LP803860](https://www.xirkit.io/products/pkcell-lipo-3-7-v-2000-mah-lp803860-c4f4) — Both serve battery-powered and portable builds — check the trade-offs; $6.99 vs $12.5
- [PKCELL LiPo 3.7 V 1200 mAh LP503562](https://www.xirkit.io/products/pkcell-lipo-3-7-v-1200-mah-lp503562-3ff4) — Both serve battery-powered and portable builds — check the trade-offs; $6.99 vs $9.95

### Variants

- [Molicel INR-21700-P50B](https://www.xirkit.io/products/molicel-inr-21700-p50b-e161) — Same maker, cylindrical 21700 Li-ion bare-cell format and nominal voltage; P50B is the 5.0 Ah / 60 A model while P45B is the 4.5 Ah / 45 A model.