OCTelect 702030 LiPo Battery (3.7V 400mAh, 2pcs)

Overview

A pair of small single-cell lithium polymer batteries in the “702030” size-code form factor, marketed for smartwatch-class builds. Smaller capacity than the other LiPo cells in this library (compare the -99BATT 503035 at 500mAh and NXD 103450 at 3000mAh) — sized for compact, low-draw wearable-style projects rather than anything power-hungry.

Key specs

• Nominal voltage: 3.7V (standard single-cell LiPo, per box label context)
• Capacity: 400mAh (per box label)
• Size code 702030: standard LiPo pouch-cell numbering = 7.0mm thick × 20mm wide × 30mm long
• Quantity per box: 2 (per label)
• Charging: not printed — standard single-cell LiPo assumptions apply (4.2V max charge voltage via a proper charge IC) until confirmed otherwise
• Connector: not visible (sealed box) — confirm pitch/type once opened

Pinout

Not visible from the sealed box — typical for this cell class is a 2-pin JST-style pigtail (red/black), consistent with every other LiPo cell in this library, but not confirmed for this specific pair until unboxed.

Wiring / typical usage

Same rules as every other bare LiPo cell in this library: never wire directly to a GPIO or an unregulated rail, always charge/discharge through a proper single-cell Li-ion management circuit (e.g. the TP4057 boards also in this library). Given the small 400mAh capacity, this pair is best suited for genuinely low-draw builds (a sleep-heavy sensor node, a small display with infrequent updates) rather than anything with a hungry radio or motor running continuously.

Code / libraries

N/A — passive power source.

Source material

• Box label (manufacturer, size code, capacity, quantity, ASIN) read directly from the supplied photo — high confidence.
• Size-code-to-dimension convention (702030 = 7.0×20×30mm) cross-referenced against the same convention already used for the NXD 103450 and -99BATT 503035 entries.
• Product photo: /inventory/octelect-702030-lipo-3.7v-400mah/product-photo.jpg — the as-supplied sealed box; the cells themselves aren’t visible without opening it.

Verification

Box label read directly from photo, including the ASIN — high confidence on manufacturer, capacity, and quantity. Connector type/pitch and charge voltage limit are UNVERIFIED — the box is sealed and the cells aren't visible. Confirm connector type and any printed cell specs once opened, before assuming standard JST-PH/SH pigtails or a bare 4.2V charge limit.

Notes / gotchas

• Smallest-capacity cells in the library so far (400mAh vs. 500mAh and 3000mAh for the others) — pick deliberately based on project power budget, not just “whichever battery is closest.”
• Update this entry with connector type and any additional printed specs once the box is opened.