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Sanyo
Sanyo 20700B 3.7 V 4250 mAh lithium-ion battery with tabs
A 20700 lithium-ion cell with 4250 mAh capacity, 12 A maximum discharge and spot-welded tabs on both ends
- Battery Type20700
- High 4250 mAh capacity powers devices longer
- 12 A max discharge supports high-drain applications
- Spot-welded tabs on both ends simplify pack assembly
- 6 V nominal voltage suits standard Li-ion circuits
- 63 g weight keeps portable builds light
High-capacity 20700 cell for custom packs
The Sanyo 20700B is a lithium-ion cell rated at 4250 mAh and 3.6 V nominal voltage. It is intended for experienced builders who assemble their own battery packs and understand the safety requirements of spot-welded tab terminals. The 12 A maximum discharge current supports moderate power applications. Buyers who need a ready-to-use consumer battery with built-in protection circuitry should look elsewhere.
Thermal behaviour and power draw
At the standard 2 A charge rate the cell accepts energy without excessive temperature rise when adequate spacing and airflow are provided. Internal resistance remains low enough that typical discharge currents well below the 12 A limit generate minimal heat. The 63 g weight and 20.35 mm diameter allow compact pack layouts that do not trap heat. No active cooling is required for normal use within the specified current range.
Sustained-load performance
Continuous operation near the 12 A ceiling will raise cell temperature progressively and demands careful thermal management in the pack design. Voltage sag under heavy load stays predictable down to the 2.5 V discharge cut-off. Repeated deep cycles at high current reduce overall cycle life compared with lighter loading. The welded tabs maintain a stable connection throughout extended discharge sessions.
Highlights
- High 4250 mAh capacity powers devices longer
- 12 A max discharge supports high-drain applications
- Spot-welded tabs on both ends simplify pack assembly
- 6 V nominal voltage suits standard Li-ion circuits
- 63 g weight keeps portable builds light
Specifications
| Battery Type | 20700 |
|---|
Questions about this item
How do I install the spot-welded tabs on this 20700B cell without damaging the 4250 mAh lithium-ion chemistry?
The tabs are already spot-welded to both ends of the 70.3 mm cell; you only need to integrate the bare terminals into your pack using a proper battery-management system that respects the 3.6 V nominal and 4.2 V charge ceiling.
What maintenance or replacement will this 12 A max-discharge 20700B need over its service life?
Lithium-ion cells like this 63 g unit have no user-serviceable parts; plan to replace the entire cell once capacity drops below your pack's requirement or after the cycle life specified by Panasonic/Sanyo is reached.
What limit appears first when I run this 20700B continuously at its 12 A rating?
Sustained 12 A discharge will hit the 2.5 V end-voltage floor fastest, cutting usable capacity well before thermal limits on the 20.35 mm diameter can become an issue.
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