The 7.2V 5.2Ah NCM battery pack is a two-series, two-parallel lithium-ion pack in a cube-shaped PVC body. The 18NC-2S2P designation records the cell type and the arrangement, and together they give 7.2V nominal at 5.2Ah rated capacity — about 37.44Wh of stored energy — in a format that is short, square and easy to tuck beside a driver board or behind a reflector.
It is built for equipment that needs more energy than a single 3.6V cell can offer but cannot spare the length of a stick pack: handheld work lights, portable instruments, security and monitoring units, industrial control boxes and small backup systems. Assembly is a question of routing the cable and mating the plug rather than terminating cells on the production line.
Because this pack sits in our custom NCM range, the version described here is a starting point as much as a finished part. Cell arrangement, wrap, lead length, connector and protection thresholds can all be re-specified for your device, and the sample you approve becomes the reference for production.
| Item | Specification |
|---|---|
| Product Name | 7.2V 5.2Ah NCM Lithium Battery Pack |
| Product Category | Custom NCM Lithium Battery Packs |
| Battery Type | Rechargeable NCM lithium-ion battery |
| Nominal Voltage | 7.2V |
| Rated Capacity | 5.2Ah (C5) |
| Minimum Capacity | 4.9Ah (C5) |
| Rated Energy | Approx. 37.44Wh |
| Cell Configuration | 18NC-2S2P |
| AC Internal Resistance | ≤65mΩ |
| Packaging | PVC |
| Dimensions | Approx. 37.3 × 37.3 × 69mm |
| Weight | 191±20g |
| Charging Voltage | 8.3-8.4V |
| Standard Charging Current | 1A |
| Maximum Charging Current | 2A |
| Charge Cut-off Current | 52-104mA |
| Standard Discharge Current | 1A |
| Maximum Continuous Discharge Current | 2A |
| End-of-Discharge Voltage | Approx. 5.6V |
| Charging Temperature | 5°C to 45°C |
| Discharging Temperature | -20°C to 55°C |
| Charge Retention | ≥85% after 28 days |
| Cycle Life | ≥1,000 cycles, with ≥70% capacity retention |
| Connector | Molex 502439-0600 plug cable |
| Cable Length | 115±10mm |
| Wire Definition | Red/black: total positive and negative; yellow: B1 voltage sensing wire |
Each pack leaves with a Molex 502439-0600 plug cable already fitted, 115 ± 10 mm long. Red and black carry the total positive and negative; the yellow lead is a B1 voltage-sensing wire that reports the mid-point of the two-cell series string to your protection board. If your board does not use mid-point sensing, say so when the specification is agreed and the lead can be left out or reassigned.
The 2A figures depend on the wiring, not only on the cells. Maximum 2A charging and 2A continuous discharge are both supported only when two positive and two negative wires are used simultaneously; with a single pair, design around the 1A standard current. That is why the lead arrangement is settled together with the electrical requirements rather than chosen at the end of the project.
Before mating the plug, confirm polarity against the approved drawing and check that the connector housing matches the socket on your board — a plug that looks similar is not necessarily the same keying. Leave a service loop, secure the cable with a clip or channel so the plug is not carrying the pack's weight, and keep the run clear of sharp edges and hot components.
The quoted dimensions cover the wrapped body only. Wire length, the plug and any foam or bracket sit outside that envelope, so add them when you check clearance inside the compartment.
Discharge is rated from −20 °C to 55 °C, while charging runs from 5 °C to 45 °C. The charging window is the narrower of the two, and deliberately so: charging near or below freezing encourages lithium plating on the anode, and charging in high heat accelerates the ageing that later shows up as lost capacity. A device brought in from a cold van should be allowed to reach room temperature before it goes on the charger, and a pack that lives in a sun-exposed housing needs shade or airflow around it.
On the discharge side the pack keeps working well below freezing, which is what outdoor work lights and winter field instruments need. Expect less usable capacity at the cold end of the range — the pack will still run the device, but for a shorter time — and avoid pulling maximum current from a cold pack until it has warmed.
Service life is rated at 1,000 cycles or more down to 70% of rated capacity. In daily use that is a multi-year replacement interval rather than an annual one, provided the pack is not left sitting at end-of-discharge for long periods and is not asked for its maximum current continuously inside a hot enclosure. Where a device is used seasonally, plan replacements on cycles actually accumulated rather than on calendar age alone.
Charge only with a dedicated lithium-ion charger set to this pack's charging voltage and current limit, and check polarity at the plug before the first connection. Reverse connection, a short circuit across the leads, overcharging, over-discharging and sustained overload are the failure modes that damage a pack and, in the worst case, start a fire.
Do not charge the pack outside its rated temperature window. Keep it away from fire, water, heaters and corrosive materials, and do not pierce, crush or immerse it. The PVC wrap is a protective cover, not a serviceable part: do not open it or disassemble the pack without authorisation from our engineering team.
Lithium cells are a regulated dangerous good. Installation, maintenance and system integration should be carried out by trained professionals working from the approved specification. A pack that has been dropped, flooded or overheated, or that shows swelling, a discoloured wrap or a damaged lead, should be taken out of service, isolated in a non-flammable area and returned through a battery recycling route rather than placed in general waste.
A configuration review starts with the device, not the pack. Send the operating voltage window, the steady and peak current with the duration of the peak, the runtime you need per charge, the space available inside the enclosure with a sketch or drawing, the charger you intend to use, and the connector or pinout your existing wiring already has. Add the operating environment, and the destination market if the finished equipment will be sold into one.
From that we propose a cell arrangement, capacity and protection setting, confirm the lead and connector, and issue a specification sheet and dimensional drawing for your approval. Ask for the current revision of both documents before you sign off a sample, since they are the reference against which production is checked.
Most projects reach us as a battery ODM solution rather than a request for a catalogue part, and that is the right way to use this product. If your product needs a different voltage, a flatter body or a connector we have not used before, say so in the first conversation — it is far cheaper to change a drawing than a moulding. Alongside custom NCM packs we build LiFePO4 replacement packs and supply matching BMS boards, so a project that grows beyond this pack has somewhere to go.
Technical questions reach the people who build the packs. Our engineering group in Shenzhen reviews your device's voltage window, load profile, enclosure space and charger before proposing a configuration; our sample group then builds units so you can validate fit and runtime before production. Cell selection, BMS design and pack assembly stay in-house, with quality checks in process and at final inspection, and a documentation team handling certificates, test reports and shipping papers. When a unit behaves unexpectedly in the field, our engineers help trace the fault and advise on installation and commissioning.
C5 is the discharge rate used to rate the pack: capacity is measured over a five-hour discharge, which for this pack is about 1A. Rated capacity is 5.2Ah and the minimum at the same rate is 4.9Ah, so use the minimum when you calculate runtime for a production device and keep the rated figure for typical expectations. A load heavier than the C5 rate will deliver less usable capacity than the label suggests.
That follows the driver current more than the pack alone. At the 1A standard discharge the pack is running at its C5 reference, which is roughly a five-hour discharge; many LED work lights draw less and run longer, while a bright multi-mode lamp can draw more. Send us the driver input range, the steady current and any start-up surge, and we will match the configuration to the shift length you need. Dimming, ambient temperature and the lamp's low-voltage cutoff all move the number too.
Yes. Send the mating connector part number or a photo of the socket, the pinout your wiring expects, the label artwork and where it should sit on the wrap. We confirm lead length, wire gauge and sensing wires against that, then issue a drawing for your approval before the sample is built. Connector, cable and label changes are normally agreed in the same round as voltage and capacity.
Protection is agreed as part of the configuration rather than assumed. Tell us whether your device already carries a protection board or a charger with its own cutoff, and the pack's overcharge, over-discharge and temperature limits are set so the two do not work against each other. If the pack is the only protection in the system, say so at the brief stage and the thresholds are written into the drawing you approve.
Keep them cool and dry, away from heaters and direct sun, and away from loose metal that could bridge the terminals. A part-charged pack is kinder than an empty one, so charge a batch before it goes into storage and top it up before the first shift. Inspect the wrap and leads when the pack comes back out, and quarantine anything showing swelling, discolouration or a damaged cable.
Only once the mechanical and electrical details match — similar voltage and capacity are not enough on their own. The square body, the Molex lead and the mid-point sensing wire all differ from a 27 mm cylinder, so check compartment space, the mating connector and whether your board uses the yellow sense lead. Send the existing pack drawing or a photo with dimensions and we will compare the two before you commit.
