# PKCELL 18650 Pack 3.7 V 6600 mAh 1S3P

> PKCELL ICR18650 1S3P lithium-ion pack: three 2200 mAh 18650 cells in parallel, 3.7 V nominal, 6600 mAh (6270 mAh min), 4.2 V charge, 3.0 V cut-off, 3.3 A (0.5C) max continuous discharge, 1.65 A max charge, ≥ 500 cycles, built-in protection, 69 × 55.5 × 18.3 mm, 155 g, JST PH 2-pin leads.

- Manufacturer: PKCELL
- Part number: ICR18650-6600 1S3P
- Category: Batteries
- Canonical page: https://www.xirkit.io/products/pkcell-18650-pack-3-7-v-6600-mah-1s3p-c2d9
- Pinout: https://www.xirkit.io/products/pkcell-18650-pack-3-7-v-6600-mah-1s3p-c2d9/pinout
- Structured JSON: https://www.xirkit.io/products/pkcell-18650-pack-3-7-v-6600-mah-1s3p-c2d9/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 | pack 18650 |
| Configuration | 1S3P |
| Nominal voltage | 3.7 V |
| Charge voltage | 4.2 V |
| Cut-off voltage | 3 V |
| Capacity | 6,600 mAh |
| Minimum capacity | 6,270 mAh |
| Max continuous discharge | 3.3 A |
| Max charge current | 1.65 A |
| Protection circuit | built in |
| Cycle life | 500 cycles |
| Dimensions | 69 × 55.5 × 18.3 mm |
| Operating temperature | -20 to 70 °C |
| Certifications | RoHS, UN38.3 test report, MSDS |

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

| Pin | Position | Kind | Chip pad | Functions | VIH | VIL | VOH | VOL | IOH | IOL | 5 V tolerant |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| RED | JST PHR-2P | positive | — | red | — | — | — | — | — | — | — |
| BLACK | JST PHR-2P | negative | — | black | — | — | — | — | — | — | — |

## Where to buy

| Supplier | Price | Stock | Checked | URL |
| --- | --- | --- | --- | --- |
| www.adafruit.com | 24.5 USD | in_stock | 2026-09-29 | https://www.adafruit.com/product/353 |

## FAQ

**What voltage powers the PKCELL 18650 Pack 3.7 V 6600 mAh 1S3P?**

Supply range 3–4.2 V.

**How much does the PKCELL 18650 Pack 3.7 V 6600 mAh 1S3P cost?**

From $24.5 at www.adafruit.com. Prices are observed unit prices before tax and shipping.

**What are the PKCELL 18650 Pack 3.7 V 6600 mAh 1S3P dimensions?**

69 × 55.5 × 18.3 mm. A STEP model is available for enclosure fit checks.

**Where does this PKCELL 18650 Pack 3.7 V 6600 mAh 1S3P 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

- [PKCELL 18650 Pack 3.7 V 6600 mAh 1S3P datasheet](https://cdn-shop.adafruit.com/product-files/353/C450_-_ICR18650_6600mAh_3.7V_20140729.pdf)
- [www.adafruit.com listing](https://www.adafruit.com/product/353)

## Part graph

### Alternatives (by use case)

- [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; $24.5 vs $12.5
- [PKCELL LiPo 3.7 V 2500 mAh LP785060](https://www.xirkit.io/products/pkcell-lipo-3-7-v-2500-mah-lp785060-70b2) — Both serve battery-powered and portable builds — check the trade-offs; $24.5 vs $14.95