Lishen 21700 4000mAh 35A
When your build needs real power, not a compromise.
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Bulk packs save more per unitVerify that your device or battery pack supports this configuration before ordering.
When your build needs real power, not a compromise.
Weak cells are the bottleneck in a lot of DIY builds — not the wiring, not the BMS, the cell itself. The Lishen LR2170LA closes that gap. 4000mAh of real capacity, 35A continuous discharge (45A with thermal cutoff when you need the extra push), and the physical durability to handle repeated high-drain cycles without losing performance. This is the cell e-bike builders, tool-pack assemblers, and flashlight modders reach for when "good enough" isn't.
What You're Getting
- 4000mAh of usable capacity — more runtime between charges, fewer cells needed per pack
- 35A continuous discharge, 45A with 80°C thermal cutoff — built for genuine high-drain demand, not just rated for it on paper
- Standard 21700 size — drops into most modern 21700 packs and devices without redesign
- Flat top terminal — ready for spot welding straight into your pack configuration
- Rechargeable, built to last — consistent output cycle after cycle
Where It Earns Its Keep
E-bike battery packs. Power tool conversions. High-output flashlights. Anywhere a build lives or dies on how much current a cell can actually deliver under real load — not just what the spec sheet claims.
The Numbers
| Spec | Lishen LR2170LA |
|---|---|
| Capacity | 4000mAh |
| Continuous Discharge | 35A (45A w/ 80°C cutoff) |
| Nominal Voltage | 3.6V |
| Max Voltage | 4.2V |
| Discharge Cut-off | 2.5V |
| Size | 21700 (21.00mm x 70.40mm) |
| Weight | 65g |
| Terminal | Flat Top |
FAQ
Will this fit my existing 21700 pack?
If your pack is built for standard 21700 dimensions, yes — this is a true-to-spec 21700 cell.
Can I actually pull 45A from this continuously?
No — 45A is the burst rating under the 80°C thermal cutoff. 35A is the safe continuous rating.
How do I know how many cells I need?
Depends on your target voltage and capacity. Not sure? Our team can help you work it out before you order.
Before You Build
Get it wrong on cell count or configuration and you're re-ordering — or worse, you've built something unsafe. Talk to us first if you're not 100% sure this cell fits your pack.
Pairs Well With
Battery Management Systems to protect your pack · Spot Welders to assemble it · Heat Shrink & Connectors to finish it off
The Mach 1 Difference
We don't sell whatever's cheapest this week. We sell the cells serious builders actually ask for by name — genuine manufacturers, accurate specs, and a team that'll tell you if a cell won't work for your project instead of just taking the order.
| Specification | Details |
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