9V to Barrel Jack Adapter

9V Alkaline Battery

9 V alkaline cell. Useful for simple portable projects with an input regulator, but non-rechargeable and limited for high-current loads.

9V Battery Holder

Holder with 5.5 × 2.1 mm center-positive barrel output. It connects a 9 V battery; it is not a regulator.

9V Battery Snap

PP3 snap lead for wiring a 9 V battery into a circuit. Check lead polarity and add regulation/protection elsewhere if needed.

Lithium Ion Polymer Battery - 3.7v 1200mAh

Single-cell 3.7 V LiPo pack with JST-PH connector and protection circuit. Needs LiPo-safe charging and polarity checks.

Adafruit PowerBoost 1000 Basic - 5V USB Boost @ 1000mA from 1.8V+

5 V USB boost converter for portable LiPo or low-voltage sources. Useful in the same design, but not a battery, holder or charger.

CR2032 Lithium Coin Cell Battery

3 V non-rechargeable CR2032 coin cell for low-current designs. Not a motor, radio or 9 V replacement.

Lithium Ion Battery - 3.7V 10050mAh (10 Ah)

Large single-cell 3.7 V Li-ion pack, listed by Adafruit as 10,050 mAh, about 37 Wh. Same voltage class as 1S LiPo packs, but much larger and subject to fit, shipping and current checks.

Lithium Ion Polymer Battery - 3.7V 350mAh

Small 1S 3.7 V LiPo pouch pack. Same chemistry family as the 500 mAh, 1200 mAh and 2500 mAh packs, but runtime, size and current headroom change.

Lithium Ion Polymer Battery - 3.7v 2500mAh

Medium 1S 3.7 V LiPo pouch pack. Useful when the design already expects a single-cell LiPo and has enough verified enclosure clearance for the larger pack.

Lithium Ion Polymer Battery - 3.7v 500mAh

Small 1S 3.7 V LiPo pouch pack. A capacity change is usually easier than a chemistry or voltage change, but connector polarity and current still need checking.

Li-Ion Battery - 18650 - 3.6V 3200mAh

Cylindrical 18650 Li-ion cell listed as 3.6 V/3.7 V and 3200 mAh. It needs a holder or welded tabs and is not a pouch-pack drop-in.

Lithium Ion Battery - 1000mAh 7.4v

2S 7.4 V Li-ion/LiPo pack. Do not substitute for a 1S 3.7 V pack unless the whole power path is designed for the higher voltage.

Lithium Ion Battery - 110mAh

Tiny 1S 3.7 V Li-ion pack with JST-PH connector and built-in protection. Good for very small loads, not high-current peaks.

Lithium Ion Battery - 400mAh

Small 1S 3.7 V Li-ion pack with JST-PH connector. Capacity is larger than the 110 mAh pack, but voltage class and charging assumptions stay 1S.