21700 Lithium Cell with Protection Board
—A protected 21700 lithium cell holds roughly 40% more energy than an 18650 in a slightly larger format, for nodes that must run longer between charges.
Specifications
- 3.7V nominal, typically 4000-5000mAh
- 21mm x 70mm cylindrical cell
- Integrated protection circuit
- Rechargeable via a TP4056-class module
- Higher continuous discharge than most 18650s
What you can build with the 21700 Lithium Cell with Protection Board
- Long-duration off-grid sensor nodes
- Solar installations needing more overnight reserve
- High-drain portable projects
- Winter operation where solar input is limited
Compatibility
Needs a 21700-sized holder — it will not fit an 18650 holder. Use protected cells only. The extra capacity is the practical answer to a solar node that runs flat during a New Zealand winter.
Shipping
Dispatched from New Zealand with courier delivery nationwide, including rural addresses. Prices are in New Zealand dollars.
Availability: Sold out
A protected 21700 lithium cell holds roughly 40% more energy than an 18650 in a slightly larger format, for nodes that must run longer between charges.
Specifications
- 3.7V nominal, typically 4000-5000mAh
- 21mm x 70mm cylindrical cell
- Integrated protection circuit
- Rechargeable via a TP4056-class module
- Higher continuous discharge than most 18650s
What you can build with the 21700 Lithium Cell with Protection Board
- Long-duration off-grid sensor nodes
- Solar installations needing more overnight reserve
- High-drain portable projects
- Winter operation where solar input is limited
Compatibility
Needs a 21700-sized holder — it will not fit an 18650 holder. Use protected cells only. The extra capacity is the practical answer to a solar node that runs flat during a New Zealand winter.
Shipping
Dispatched from New Zealand with courier delivery nationwide, including rural addresses. Prices are in New Zealand dollars.