Surlon Power LFP| Lighting Battery-LFP 3.2V1.8Ah

Product Overview

A 3.2 V, 1.8 Ah LiFePO4 cell in a standard 18650 can, the LB3.2V1.8Ah stores 5.76 Wh. It is a single-cell (1S1P) pack: one can, one protection circuit, and the terminals brought out on leads to whatever plug the fixture needs.

That format is the point. This is energy that sits inside a luminaire rather than beside it in a separate box — which is what emergency heads, path lights and hand torches are designed around.

Fitted with a lead and plug, it works as a 3.2V battery pack for LED light fixtures whose driver expects a 3.2 V nominal rail and a 3.65 V charge. Lighting OEMs build it into production fixtures; distributors stock it as a service replacement for the same 18650 footprint.

It is offered as a drop-in replacement for traditional lithium-ion cells of this can size. Fixtures that previously ran Ni-Cd or Ni-MH can often move across as well, but not automatically: the charging circuit, the cut-off voltage and the charge current all have to be reviewed against a 3.65 V charge and a 2.5 V discharge end point before a production run is committed.

The lighting family runs from 1.6 Ah to 4.8 Ah, so a fixture that needs more or less energy can usually stay with one supplier and one connector standard.

Because the can is small, most of the engineering conversation ends up at the connector and the compartment — plug type, lead length, polarity, and the clearance left for wiring inside the head.

Specifications

Automated Assembly

These cells are built on automated lines, and the practical benefit is repetition. A run of emergency luminaires assembled in March should behave the same way as a run assembled in September, without the engineering team re-testing every batch.

Automation is what removes the hand-to-hand variation that shows up as a spread in internal resistance. Internal resistance is the number that decides how a cell holds voltage under load, so a narrow spread means the driver sees the same conditions from one shipment to the next.

Repeatability carries through to the termination. Because the lead, the plug and the crimp are assembled the same way each time, a fixture designed around one shipment still mates correctly with the next — which matters more on a small pack than on a large one, because there is no room in the compartment for a rework loop.

Every pack leaving our lighting battery pack factory is built to a documented specification, and that document is the version we ask you to confirm on a repeat order rather than assuming it has stayed unchanged.

For a distributor, that is what makes a part number worth stocking. For an OEM, it is what lets one validation run cover several production batches.

Safety & Protection

• Integrated protection circuit — a dedicated protection system sits with the cell and responds to over-temperature, short circuit and over-voltage by opening the current path instead of letting a fault run.
• Sealed against leakage — the can is built to hold its electrolyte through normal charge and discharge cycling, so a closed luminaire head stays clean and the driver board is never exposed to leakage.
• Thermally forgiving chemistry — lithium iron phosphate is the steadier of the common lithium chemistries under heat, which is why it is widely chosen for fixtures that are sealed and unventilated.
• Sized for lighting loads — the protection sits between the cell and the driver and covers the brief inrush at switch-on as well as the steady running load.
• Predictable failure behaviour — when a fault does occur the circuit opens and the fixture goes dark, which is easier to diagnose on a service visit than a lamp that stays partly live.
• What it does not replace — the protection circuit will not correct a charger set to the wrong voltage or a compartment that overheats; those still have to be checked at design stage.

Discharge Performance

Internal resistance is held to ≤110 mΩ. That figure is why a 3.2V battery pack for LED light fixtures holds its voltage at switch-on: a low-resistance cell sags less under a sudden load, so the driver sees a stable rail instead of a dip in the first fraction of a second.

The pack is rated at 1C for charging and 2C for discharge, and the specification lists a working discharge current of 180 mA to 3000 mA. For lighting work that is generous headroom. A lamp drawing a few hundred milliamps sits comfortably inside the window, and a fixture that pulls harder for a moment — a start-up surge, a brighter mode, a cold lamp — has room to do it without pushing the cell against its limit.

The charge rate matters just as much on the other side of the cycle. Solar garden lights recover their energy through a short window of daylight, and a cell that accepts a 1C charge makes more of that window than one restricted to a fraction of it.

Discharge stays level rather than sloping away, so brightness does not step down through the night. The discharge end point is set at 2.5 V, which gives the driver a clean cut-off to work against rather than an ambiguous tail.

Where a fixture's load profile is unusual — a heavy inrush, or a long low-current standby with a short full-power burst — it is worth checking the numbers against the rated window before the design is frozen.

Service Life & Environment

• Built for daily cycling — a 3.2V battery pack for LED light fixtures is cycled every day of its life, so repeated charge and discharge is the normal duty here rather than an occasional event, and the cell is built accordingly.
• Five-year design life at 55 °C — the listed design life is 5 years at 55 °C, stated at an elevated temperature rather than at a comfortable bench condition, which leaves margin in a cooler installation.
• Charging window 0–60 °C — keep charging inside this band. A solar head that has been in direct sun all afternoon should be allowed to come down before charging begins.
• Discharging window 0–60 °C — the parameter table lists 0–60 °C; the model summary elsewhere gives a wider −20 to 65 °C discharge span, so confirm the rating for the exact revision you are supplied before designing a cold-climate fixture.
• Storage −20 to 65 °C — stock held in a warehouse or a service van stays inside this range. For long storage, keep the pack cool and dry and manage its state of charge according to the handling instructions supplied with your order.
• Environmental profile — the range has passed environmental system certification, and the LiFePO4 chemistry avoids the cadmium used in Ni-Cd packs.
• One documented system — the same lighting battery pack factory that assembles these cells works to a documented quality and environmental system, so the specification you approve is the one that gets built.

Connector & Customization

Connectors are supplied according to customer requirements. That is deliberately open: the plug body, the wire gauge, the lead length and the polarity are set by the drawing you send rather than by a fixed catalogue option. Send the mating connector's part number and the pack is built to mate with it.

Lead length is worth settling early. A can sitting deep in a head needs enough lead to reach the driver without a loop that traps against the housing, and a lead that is too short forces the assembler to splice — which is the point where a production line starts producing scrap.

For fixtures with a different energy requirement, the same family covers other capacities and the connector standard can stay unchanged, so the assembly drawing does not have to be reissued. If the project calls for a larger block — a 3.2V 16Ah LiFePO4 lighting battery, for example — send the requirement and we will review what configuration fits your compartment and your charger.

Customization is not limited to the lead. Where a project needs a termination method that is not on our standard list, or a printed sleeve and label detail, raise it at quotation stage with your sales contact rather than after the first shipment.

Because the cell is small, changes here are inexpensive to make before tooling and expensive to make afterwards. The drawing review is the moment to get them right.

Lighting Applications

• Emergency light — a single cell behind the driver of a maintained or non-maintained head, where the 2C discharge rating covers the current surge as the lamp transfers to battery.
• Flashlight — hand torches and inspection lamps running a 3.2 V rail; the small can suits a tube body where the cell sits inline with the barrel.
• Garden light — bollards, path lights and post-top fittings; the small can fits inside the head, and the sealed construction suits a housing that stays closed for years.
• Solar light — lamps charged from a small panel through a controller; the 1C charge acceptance helps recover a short daylight window, and the operating range covers a warm housing.
• Other LED fixtures — any fixture running a single-cell 3.2 V rail can use this pack, provided the driver's cut-off and charge settings are checked first.
• What to send with an application question — the fixture type, the driver, the load and the space available. Those four answers usually settle whether this capacity is the right one, and they take less time to gather than a sample round trip.

Nickel Battery Pack Range

Our lighting battery pack factory also produces Ni-Cd and Ni-MH rechargeable packs, in different capacities and sizes, built to industrial standards and to customization requirements. That line is not a sideline: it is where 17 years of emergency lighting engineering expertise sits, and it is backed by multiple technical patents and a complete set of certificates.

The nickel packs are specified for strong performance at high temperature, up to 0–70 °C, which is why they still hold a place in sealed emergency heads where the internal temperature climbs well above the room. They offer a long service life and low internal resistance, and they come from a brand many lighting buyers already know and specify by name.

Flexibility is part of the offer: capacities and sizes are built to customer requirements rather than taken from a fixed list.

The scale behind the line is worth knowing when a programme has a long life. Surlon Power has established strategic partnerships with Fortune 500 enterprises and ranks among mainland China's leading exporters of nickel batteries — volume that keeps a mature part number available after a fixture has been in the field for a decade.

For a lighting OEM already running a nickel design, that continuity is often the deciding factor: the pack, the certificates and the production line all stay in one place.

Nickel Pack Applications

• Emergency lighting already approved on nickel — where a fixture was signed off years ago around a Ni-Cd or Ni-MH pack, keeping the chemistry avoids reopening the charge circuit and the approval file.
• Emergency call and intercom units — long standby with an occasional high-current transmit is a duty nickel packs handle well, and it is one of the segments the range was built around.
• Solar lighting in hot locations — the 0–70 °C working range leaves margin in a post-top head that sits in the sun for most of the day.
• Back-up power — short-duration support for control electronics and exit signage, where the pack is called on rarely but must be ready.
• Torch and portable lamps — the traditional hand-lamp format, where a mature, well-known cell is easier to source and service than a new design.
• Where LiFePO4 fits instead — for a new fixture design, the LiFePO4 cell on this product brings a flatter discharge and a lighter pack; the nickel range stays the answer where an existing design, an existing approval or a hot compartment calls for it.

Ordering & Quotation Steps

1. Share the fixture and the driver — the LED driver's input window, the load current and how long the light must run on battery.
2. Share the space — compartment dimensions, how the can is retained, the lead route and the clearance left for the plug.
3. Specify the connector — mating plug part number, wire gauge, lead length and polarity, so the pack arrives ready to fit rather than ready to rework.
4. Confirm the charging arrangement — the charger or controller model, its output voltage and current, and the cut-off it uses.
5. Agree the configuration — capacity, protection and lead. If the project needs a larger block such as a 3.2V 16Ah LiFePO4 lighting battery, say so here, because it changes both the compartment and the charger review.
6. Ask for the documents you need — the model drawing, the protection specification and the test reports for the exact revision, plus handling and transport papers where the shipment requires them.
7. Ask your sales contact about sample availability and schedule, then confirm price, quantity breaks, lead time, packing and shipping terms for the project; these are quoted per order and are not fixed by the product itself.

Technical Support & Model Matching

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.

FAQ