Wide Temperature Lithium Battery

18650 Wide-Temp Cell Spec Guide

If you are qualifying a wide temperature lithium battery for equipment that has to start in a cold field and keep working in summer heat, this guide turns the published numbers for the TWE0388 / HL18650V 18650 lithium battery into a selection decision you can defend to your thermal and safety reviewers.

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-40°C to 85°CPublished discharge window

2900 / 2800mAhTypical / minimum capacity

10AMax continuous discharge

≤18mΩInternal resistance

>500Full charge-discharge cycles

-40°C to 85°C 18650 3.6V 2900mAh Wide Temperature Lithium Battery

How to Use This Selection Matrix

Three passes are enough to go from a deployment brief to a cell shortlist. Work top to bottom and stop where your data runs out — that gap is exactly what the quote request should ask about.

Identify the deployment temperature band

Start with the highest and lowest temperature your device must actually survive while discharging. Compare that window with the published -40°C to 85°C discharge range before you look at any other number.

Narrow by capacity and continuous current

Match your run-time target to 2900mAh typical / 2800mAh minimum, then confirm the load profile stays inside the 10A maximum continuous discharge rating with headroom for peaks.

Confirm charge boundary and compliance

The product page publishes CC/CV charging with a 4.2V cutoff and lists IEC62133, UN38.3 and UL. It does not publish a charge temperature window, so lock that down with engineering before design freeze.

Temperature-Band Qualification Matrix

One published rating covers the whole window, so this table does not invent per-band derating. Each row tells you what the data supports today and what to confirm in writing.

Operating band	What the published data supports	Continuous discharge	Charging caution	Recommended use
-40°C to -20°C	Inside the published -40°C to 85°C discharge window. Capacity is stated as 2900mAh typical / 2800mAh minimum for the cell; band-specific derating percentages are not published.	10A max continuous — a single rating for the full window, not a cold derated figure	No charge temperature range published. Confirm cold-charge limits at RFQ.	Cold-start field instrumentation, winter-deployed sensors, remote GPS trackers
-20°C to 0°C	Inside the published discharge window. Cycle life is stated as more than 500 full charge-discharge cycles.	10A max continuous	CC/CV to 4.2V cutoff; charge window to be confirmed at RFQ.	Outdoor monitoring nodes, overnight idle equipment, unheated enclosures
0°C to 45°C	Comfortable middle of the published window. Internal resistance is stated as ≤18mΩ for pack-to-pack consistency.	10A max continuous	Standard CC/CV charging with 4.2V cutoff as listed.	Rugged handhelds, IoT devices, vehicle-mounted devices
45°C to 85°C	Upper end of the published discharge window — the differentiator for in-enclosure electronics and sun-exposed housings.	10A max continuous	Heat raises charging risk; confirm the upper charge boundary at RFQ.	Automotive telemetry, outdoor energy storage, sealed roadside cabinets

Data-integrity notes

Topwell publishes one discharge window (-40°C to 85°C) and one continuous current rating (10A). No band-by-band capacity curve is published on the product page.
Charge temperature limits, cell dimensions and weight are not listed on the product page — request them from engineering rather than assuming them.
Where a band needs a number that is not published, this matrix says "confirm at RFQ" instead of guessing.

Item No. TWE0388 · Model HL18650V · 3.6V nominal · 2900mAh typical

TWE0388 / HL18650V Specification Sheet

The numbers your enclosure, protection circuit and thermal budget have to live with — exactly as published, with nothing extrapolated.

Item No. / Model	TWE0388 / HL18650V
Nominal voltage	3.6V
Typical capacity	2900mAh
Minimum capacity	2800mAh
Wide temperature range	-40°C to 85°C (discharge)
Max continuous discharge	10A
Internal resistance	≤18mΩ
Cycle life	>500 full charge-discharge cycles
Charge method / cutoff	Standard CC/CV · 4.2V
Certifications	IEC62133, UN38.3, UL
Manufacturing standards	ISO9001, ISO14001, BSCI
Customisation	OEM/ODM collaboration offered

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Form-Factor & Chemistry Comparison

Before you fix the cell, check that the envelope and chemistry match how your product is built and serviced. Only the Topwell column carries published figures; the others are orientation notes to check with each supplier.

This page

Wide-temp 18650 (TWE0388)

Fit: 18650 cylindrical format for design-constrained assemblies
Energy: 3.6V, 2900mAh typical / 2800mAh minimum
Temperature: -40°C to 85°C discharge
Cycle life: more than 500 full cycles

Trade-off: you accept 2900mAh-class capacity in exchange for the widest published window and a 10A continuous ceiling.

Alternative

Standard 18650 cell

Fit: same 18mm-class cylindrical envelope, widest supply base
Energy: capacity-led grades are common
Temperature: typically a narrower published discharge window
Cycle life: depends on grade and chemistry

Trade-off: easier sourcing, but cold and heat limits usually force derating, heating or active thermal management.

Alternative

26650 LiFePO4 cell

Fit: larger can, needs more mechanical room
Energy: different nominal voltage per cell, so pack architecture changes
Temperature: chemistry-dependent — confirm the published window
Cycle life: often marketed for long service life

Trade-off: more volume per cell and a different pack design for the sake of chemistry stability.

Alternative

Lithium-polymer pouch

Fit: thin, shape-flexible pouch formats
Energy: strong volumetric flexibility for slim products
Temperature: needs a specifically rated wide-temperature variant
Cycle life: varies widely by design

Trade-off: no rigid can, so mechanical support and protection electronics carry more of the design load.

Charging & Cold-Boundary Conditions

Discharge is only half the story. The product page states standard CC/CV charging with a 4.2V cutoff — that defines the electrical protocol, not the temperature at which it is safe to apply it.

The failure mode to design around is cold charging, not cold discharging. Pushing charge current into a cold cell is where lithium plating risk appears, and it is the reason a battery that starts reliably at -30°C can still be damaged by an unmanaged charger the next morning.

Because the current product page does not publish a charge temperature range, treat this as an open item. Ask engineering for the charge window, the acceptable charge current below 0°C, and whether your charger should block or taper current in the cold. Apply the same discipline at the hot end of the window.

Not published: charge temperature rangeConfirm it in writing with engineering before you ship a charger algorithm.

Do not infer cold-charge limits from the discharge ratingThe -40°C to 85°C figure is stated for discharge. It is not a charging specification.

Keep the 4.2V cutoffRaising the cutoff to chase capacity shortens cycle life and voids the published basis of >500 cycles.

Wide temperature 18650 cell with CC/CV charging detail

CC/CV charging to a 4.2V cutoff, as listed on the product page. Temperature limits for charging must be confirmed at RFQ.

Compliance: What You Can Hand Your Safety Reviewer

These are the certification and manufacturing references listed for this cell. They tell your reviewer which standards the part is assessed against — request the current certificates alongside the quote.

IEC62133

The international safety standard for secondary cells and batteries. It is the reference most reviewers ask for when a cell goes into a portable or field-deployed device.

UN38.3

The transport test regime for lithium cells and batteries. It matters because your finished pack cannot ship by air or sea without it being addressed.

UL

UL safety certification for lithium cells, commonly requested by North American customers and by end-product safety files.

Manufacturing standards listed for this product: ISO9001 (quality management), ISO14001 (environmental management) and BSCI. Ask for the current certificate copies and the report dates together with your quotation so your file stays complete.

Scenario-to-Specification Decision Module

Every deployment stresses a different number. Match your scenario to the specification that actually decides the design, then use the buyer action to close the gap before prototyping.

Same cell, different stress points: cold start for field nodes, heat endurance for sealed telemetry cabinets.

Outdoor sensor nodes & GPS trackers

Cold-start capability decides it

Spec to check: -40°C to 85°C discharge window, 2900mAh typical capacity
Buyer action: Ask engineering for cold-end capacity behaviour at your lowest deployment temperature before you fix the battery count.

Military equipment & field instrumentation

Service life and consistency decide it

Spec to check: >500 full cycles and ≤18mΩ internal resistance
Buyer action: Request cycle-life data and cell-to-cell IR consistency for pack matching in multi-cell assemblies.

Vehicle-mounted devices & automotive telemetry

The hot end of the window decides it

Spec to check: Discharge to 85°C and a 10A maximum continuous rating
Buyer action: Model the in-cabinet temperature rise; if it approaches 85°C, plan airflow or thermal spacing rather than relying on the cell alone.

IoT devices & rugged handhelds

Energy per cell plus paperwork decides it

Spec to check: 3.6V, 2900mAh typical, IEC62133 / UN38.3 / UL listed
Buyer action: Collect the certificates with the quotation so customs and product-safety reviews are not blocked later.

Integration Checklist for Design Engineers

Six mechanical and electrical constraints to close out before the first prototype build.

Confirm the exact cell dimensions and weight from the drawing — they are not published on the product page.
Size protection and fusing around the 10A maximum continuous discharge, with margin for inrush peaks.
Budget for ≤18mΩ internal resistance and match cells by IR when building multi-cell packs.
Give the cell a thermal path: sealed enclosures near the 85°C end need spacing and airflow planning.
Lock the charge temperature window with engineering, then implement it in the charger firmware.
Keep the 4.2V charge cutoff and standard CC/CV protocol to preserve the published cycle-life basis.

18650 cell mechanical and electrical integration reference

Mechanical envelope, current ceiling and resistance budget are the three items that most often delay a build.

Request a Quote for TWE0388 / HL18650V

Tell us your deployment temperature window, load profile and annual volume. The team can return the datasheet, certification copies and a build proposal for your review.

Datasheet and drawing pack, including the dimensions the product page does not list
Charge temperature window and cold-charge guidance from engineering
Sample evaluation units for bench and chamber testing
OEM/ODM collaboration — the product page states this cell is designed for OEM/ODM work

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Frequently Asked Questions

what information is shown for this product?

review the product details, images, and specifications presented on the official product page.

where can i check the intended application?

use the application and use-case information published on the official product page.

which specifications should i confirm before ordering?

confirm the specifications and options listed for the exact product variant before placing an order.

where can i check available options?

check the official product page or ask the supplier about options shown for the selected product.

how can i request product information?

use the official contact or inquiry path provided on the site.

what should i include in an inquiry?

include the product page, intended use, required quantity, and any specifications you need the supplier to review.

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18650 Wide-Temp Cell Spec Guide