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Battery cells for energy storage

Storage packs run at fractions of a C. That inverts the usual selection logic: capacity per cell and cycle life at realistic depth of discharge matter, peak current does not.

In one paragraph

Energy storage cells are selected for capacity, cycle life at a stated depth of discharge and calendar behaviour, not peak current. Typical choices in this catalogue are 4,800 to 5,650 mAh 21700 cells operating below 0.5 C.

Why this format

What decides whether it is the right choice

1

Cell count drives enclosure cost more than cell price at storage volumes

2

Cycle life figures are only comparable when the depth of discharge and charge rate match

3

Low-rate operation keeps cells cool, which is what makes long warranty terms achievable

Models on file

Current specification table

Sorted by continuous discharge. Every figure is quoted with the condition the manufacturer attaches to it.

Model Brand Format Capacity Cont. discharge Max charge Energy Source
INR18650-30Q Samsung SDI 18650 3,000 mAh 15 A — — Pending
INR21700-M50LT LG Energy Solution 21700 4,800 mAh 14.4 A — — Pending
INR21700-M58T LG Energy Solution 21700 5,650 mAh 12.5 A — — Pending
INR18650-M35A Molicel 18650 3,450 mAh 10 A 1.7 A 12.5 Wh Datasheet
NCR18650GA Panasonic 18650 3,450 mAh 10 A — — Pending
INR18650-M30A Molicel 18650 3,000 mAh 10 A 3.0 A 10.8 Wh Datasheet
INR18650-MH1 LG Energy Solution 18650 3,200 mAh 10 A 3.1 A 11.5 Wh Pending
INR18650-MJ1 LG Energy Solution 18650 3,500 mAh 10 A 3.4 A — Pending
INR21700-50GB Samsung SDI 21700 4,900 mAh 9.8 A — — Pending
INR21700-50E Samsung SDI 21700 4,900 mAh 9.8 A — — Pending
INR18650-35E Samsung SDI 18650 3,500 mAh 8 A — — Pending
INR21700-M50T LG Energy Solution 21700 5,000 mAh 7.275 A — 18.2 Wh Pending

Selection map

Which grade, for which job

5,650 mAh 21700

Maximum capacity per cell where floor space binds

5,000 mAh 21700

Balance of availability, capacity and second-source options

3,200–3,500 mAh 18650

Small modules, UPS and retrofit designs built around 18 mm tooling

Common questions

Before you specify

Do the discharge figures assume a temperature cut-off?

Yes, and that is the point. A 60 A figure valid only while the pack holds the cell under an 80 °C surface cut cannot be used in a pack with no thermal path. Where a manufacturer states a condition, we publish it alongside the number.

Can cells of different models share one pack?

No. Cells of different model, batch or state of charge must not be mixed in one pack. Uneven cells force the BMS to cut early at both ends and the pack loses the capacity it was specified for.

What documentation ships with an order?

UN38.3 test summary, MSDS and the transport classification for the shipping configuration. Certificate numbers are quoted only for documents we actually hold, and only where the model appears in the certificate coverage list.

Other formats

If this one does not fit

21700 cells 18650 cells Cell comparisons Cell selection guide

Narrowing down? Send the load profile

Peak current, continuous current, duty cycle and target cycle life. We will come back with the candidates and the documentation behind each one.

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