Panasonic NCR18650B 3.6V 3400mAh (protected) is the most famous out of all 18650 batteries. When first released several years ago it was the highest-capacity 18650 cell mass produced and thus an essential ingredient in the rechargeable revolution and for the adoption of electric vehicles like the Model S (which has been powered by the Panasonic 18650B for some years). It is still the most requested cell for custom packs. A PCB protection circuit built in to this cell makes this cell perfect for low power applications like torches, the PCB prevents over discharge of the cell which can severely shorten the life of the cell.
Battery Specifications:
- Model: NCR18650B
- Positive terminal style: Button top
- Protected (PCB): Yes
- Manufacturer: Panasonic
- Country of Origin: Japan
- Chemistry: NCR
- Rated capacity (minimum): 3250 mAh
- Nominal capacity: 3350 mAh
- Max. continuous discharge current: 6.7A (2C)
- Nominal voltage: 3.6 V
- Discharge end voltage: 2.5 V
- Over current protection 6-7A
- Over charge voltage 4.33V
- Charging voltage: 4.20 +/- 0.03 V
- Standard charging current: 1.25 A
- Dimensions: Diameter 18.5mm Length 68.5mm

Panasonic Data sheet
Official Data sheet
Important:
- Never completely discharge Li-ion battery (below 2.5V under load).
- Charge fully to 4.2V before first use.
- Never use force to install (insert) Li-ion battery.
- Do not use old and new battery cells together.
- Use only a high quality battery charger.
- Do not expose to heat.
- Do not short (connect) positive (top), and negative (bottom) battery terminals (contacts). Keep battery that is not in use in plastic holder (or any insulating container).
- Never charge battery over 4.25V (another reason to use high quality battery charger).
- Do not charge unattended unless using an intelligent charger that shuts off at full charge.
- Do not store your Li-ion batteries fully charged (for extended period of time).
- Store in cold and dry place at approximately 3.7V (storage charge).
- After battery is discharged don't leave it discharged, charge it as soon as possible.
Battery Specifications:
- Model: NCR18650B
- Positive terminal style: Button top
- Protected (PCB): Yes
- Manufacturer: Panasonic
- Country of Origin: Japan
- Chemistry: NCR
- Rated capacity (minimum): 3250 mAh
- Nominal capacity: 3350 mAh
- Max. continuous discharge current: 6.7A (2C)
- Nominal voltage: 3.6 V
- Discharge end voltage: 2.5 V
- Over current protection 6-7A
- Over charge voltage 4.33V
- Charging voltage: 4.20 +/- 0.03 V
- Standard charging current: 1.625 A
- Dimensions: Diameter 18.5mm Length 68.5mm
Important:
- Never completely discharge Li-ion battery (below 2.5V under load).
- Charge fully to 4.2V before first use.
- Never use force to install (insert) Li-ion battery.
- Do not use old and new battery cells together.
- Use only a high quality battery charger.
- Do not expose to heat.
- Do not short (connect) positive (top), and negative (bottom) battery terminals (contacts). Keep battery that is not in use in plastic holder (or any insulating container).
- Never charge battery over 4.25V (another reason to use high quality battery charger).
- Do not charge unattended unless using an intelligent charger that shuts off at full charge.
- Do not store your Li-ion batteries fully charged (for extended period of time).
- Store in cold and dry place at approximately 3.7V (storage charge).
- After battery is discharged don't leave it discharged, charge it as soon as possible.
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- We only deal with manufacturers or authorised distributors.
- We inspect every battery and do our own testing.