Executive Summary
This guide compares three common rechargeable Li-ion/Li‑polymer capacities used in electronic badge pins: 80 mAh, 120 mAh and 200 mAh. It gives the technical differences, runtime calculations, charging and safety requirements, cost tradeoffs, supplier selection criteria, and a step-by-step decision process to choose the right cell for mass-produced event badges, wearable pins, LED name badges, and other low‑profile portable LED devices.
Key conclusions:
– 80 mAh: smallest size and lowest cost. Typical useful for flashing LEDs or low-duty indicator badges where runtime requirement is ≤4 hours at ~20 mA average or where size/weight is the primary constraint.
– 120 mAh: middle ground. Provides ≈50% more energy than 80 mAh while remaining compact. Best where runtime targets are 6–8 hours with moderate duty cycles and space allows a slightly larger cell.
– 200 mAh: highest runtime (≈2.5× 80 mAh). Required when continuous illumination, multiple LEDs, or long standby time is needed. Tradeoffs: higher cost, larger dimensions, heavier, slower recharge, and potential fit/layout changes.
Quantitative references (assume nominal cell voltage 3.7 V):
– Energy: 80 mAh = 0.296 Wh; 120 mAh = 0.444 Wh; 200 mAh = 0.740 Wh.
– Runtime (example): at 20 mA constant draw: 80 mAh → 4.0 h; 120 mAh → 6.0 h; 200 mAh → 10.0 h.
This guide provides formulas, design constraints, compliance requirements (IEC 62133, UN38.3, IATA), selection checklist, pricing analysis, and a practical procurement workflow for B2B buyers.
What Is [Product] and Who Uses It
What Is [Product]
– “Electronic Badge Pin Battery” refers to small rechargeable lithium-ion (Li‑ion) or lithium‑polymer (Li‑Po/pouch) cells used as the primary energy source in wearable electronics shaped like pins, badges, or nameplates. These are low-capacity pouch or prismatic cells with nominal voltage ~3.6–3.7 V and capacities commonly sold as 80 mAh, 120 mAh, and 200 mAh for badge applications.
– Batteries are typically integrated into the badge housing, connected to an on-board PCB that includes an LED array, microcontroller/IC, and a charging port or pogo-pin contacts.
Who Uses It
– Event organizers and promotion companies producing single-use or reusable LED name badges for conferences, concerts, and festivals.
– Toy and novelty manufacturers creating light-up pins and mini-wearables.
– Corporate procurement teams sourcing branded LED badges for trade shows or corporate events.
– Electronics OEMs embedding small cells in ID badges, sensor tags, or low-power wearables that must fit a thin form factor.
– Contract manufacturers and battery pack assemblers specializing in pouch cell integration and PCB assembly.
Operational contexts:
– Single-shift events (4–8 hours), multi-day reuse with nightly recharging, or long-life standby where minimal idle current is critical.
– Battery is often charged between events via micro-USB, magnetic pogo connectors, or batch charging fixtures.
Why Demand Is Growing
Market drivers for rechargeable badge batteries:
– Shift from disposable coin cells (CR2032) to rechargeable Li‑ion for sustainability and total cost-of-ownership (TCO) reduction. Rechargeables reduce recurring purchase of disposables across recurring events.
– Increasing use of multi-color LEDs, Bluetooth Low Energy (BLE) or simple MCUs for effects and interaction increases average current draw and runtime requirements.
– Demand for slimmer, branded, reusable badges for sustainability and premium brand image.
– Cost pressure and high-volume event procurement favors set-and-forget battery solutions that permit overnight charging and reuse.
– Safety and regulatory pressure to use cells with protection circuits and certified supply chains (IEC 62133, UN38.3) drives buyers toward established cell capacities and standardized charging practices.
Volume implications:
– Large events: orders of tens of thousands of units; small per-unit battery cost differences magnify procurement budgets.
– Prototype and low-volume: flexibility to test multiple capacities before committing to injection-molded housings.
Key Technology Differences
Chemistry and Nominal Voltage
– Cells used are typically Li‑ion/Li‑polymer with nominal voltage 3.6–3.7 V. Non-rechargeable lithium coin cells (CR2032, 3.0 V) are a different category—higher capacity at low drain but not rechargeable and poor at high drain due to high internal resistance.
Form Factor and Dimensions
– Li‑polymer pouch cells are used to optimize thickness and shape. Typical thicknesses:
– 80 mAh: ~2.5–4.0 mm thick, footprint variable (examples: 20×12 mm to 30×20 mm)
– 120 mAh: ~3.0–5.0 mm thickness, larger footprint
– 200 mAh: ~4.0–6.0 mm thickness, substantially larger footprint and mass
– Manufacturers specify precise cell dimensions; always verify mechanical fit in badge housing and connector locations.
Internal Resistance and Discharge Capability
– Internal resistance (ESR) increases with reduced cell size; smaller cells often have higher ESR, causing greater voltage sag at higher current pulses.
– Continuous discharge rating for badge cells is typically 0.5–1 C (e.g., 80 mAh cell safe continuous current ~40–80 mA). Peak LED pulses can be higher if short duty cycle; ensure ESR and voltage sag do not cause undervoltage lockout on controllers.
Capacity Tolerances and Aging
– Rated capacity is typically ±10% at factory. Effective delivered capacity depends on test conditions (0.2C/25°C). Capacity degrades with cycles and high temperature. Expect 70–85% capacity after 300–500 cycles depending on charge/discharge depth and temperature.
Charging Behavior and Circuits
– Standard charging: CC–CV to 4.2 V with termination at ~0.05 C. Recommended charge current is typically 0.2 C (e.g., 16 mA for 80 mAh, 24 mA for 120 mAh, 40 mA for 200 mAh). Higher currents shorten charge time but increase heat and stress.
– Some suppliers provide cells with integrated protection PCBs (overcharge/over-discharge/short-circuit). For standalone cells embedded in badges, a protection PCB is recommended unless the badge offers hardware-level protections.
Thermal Characteristics
– Operating temperature range typically –20°C to +60°C for discharge; charging recommended 0–45°C. Elevated temperatures accelerate aging and risk swelling. Badge enclosures must allow heat dissipation during charging.
Manufacturing and QC Differences
– Tier‑1 manufacturers (Panasonic, Murata, Samsung SDI) supply consistent quality with strict QC and certifications.
– Smaller factories on B2B marketplaces vary widely; insist on batch testing, capacity distribution reports, and UN38.3/IEC 62133 certificates.
Key Features and Specifications to Evaluate
Electrical Specs
– Nominal voltage: 3.6–3.7 V
– Rated capacity (mAh): 80, 120, 200
– Energy (Wh) = (mAh × Vnom)/1000
– 80 mAh → 0.296 Wh (3.7 V)
– 120 mAh → 0.444 Wh
– 200 mAh → 0.740 Wh
– Recommended charge current: listed in mA and C-rate (prefer 0.2 C)
– Maximum continuous discharge current (mA)
– Peak pulse discharge current (mA) and allowed duty cycle
– Internal resistance (mΩ) at 1 kHz (lower is better)
Mechanical Specs
– Dimensions (L × W × T in mm)
– Weight (g)
– Connector type: PCB tab, wire leads, flex tail for direct soldering, or connector header
Safety and Lifecycle
– Cycle life (number of cycles at specified DOD resulting in 80% capacity retention)
– Storage and shelf state-of-charge (recommended storage at ~40% SOC)
– Self-discharge rate (% per month)
Environmental and Compliance
– Certifications required: IEC 62133, UN38.3 (transport), CE/EMC for finished product, RoHS
– Recommended operating temperature ranges
– Packaging for shipments: state of charge restrictions for air shipments (IATA)
Integration and Pack-Level Specs
– If battery pack includes protection PCB: protection thresholds (overcharge cut-off, over-discharge cut-off, overcurrent trip)
– Mounting and thermal bonding options: adhesive foam, molded recess
– Recommended fusing/thermistor for assembly (PTC fuse rating, temperature sensor placement)
Testing and QC
– Acceptance testing: capacity at 0.2 C, impedance measurement, open-circuit voltage, visual inspection for swelling
– Supplier test reports per batch and sample retention policy
Useful formulas
– Runtime (hours) = Capacity (mAh) / Average load current (mA)
– Average load current = (LED on-current × duty cycle) + MCU standby current + other peripherals
– Charge time (hours) ≈ (Capacity (mAh) / Charge current (mA)) × 1.1 (account for CC–CV taper)
Practical examples
– Single 20 mA LED blinking at 10% duty: average current = 20 mA × 0.1 = 2 mA. Runtime: 80 mAh / 2 mA = 40 hours; 120 mAh = 60 hours; 200 mAh = 100 hours.
– Two 10 mA LEDs constant + MCU idle 2 mA: total = 22 mA. Runtime: 80 mAh → 3.6 h; 120 mAh → 5.45 h; 200 mAh → 9.1 h.
Pros and Cons
80 mAh
– Pros: Smallest footprint and thickness; lowest per-unit cost; lighter weight; fastest integration into ultra-thin badges.
– Cons: Limited runtime for moderate/high loads; higher ESR relative to larger cells causes greater voltage sag under pulses; lower energy margin for aging and temperature effects.
120 mAh
– Pros: Balanced size vs runtime; ~50% more energy than 80 mAh with modest increase in physical size; often the best compromise for single-shift event badges.
– Cons: Slightly higher cost and thickness; still limited when continuous LEDs or BLE radios are used.
200 mAh
– Pros: Longest runtime—suitable for continuous illumination, multi-LED configurations, or multi-day events with intermittent recharging; lower ESR, better voltage stability under load.
– Cons: Larger size and thickness (may require redesign of enclosure); higher per-unit cost and shipping weight; slower charge times; may require different mounting or battery retention method.
Other cross-cutting considerations
– Safety: larger capacity can increase energy released in a failure. Proper protection is mandatory.
– TCO: higher upfront battery cost may be offset by lower replacements and longer useful runtime between charges.
– User experience: higher capacity reduces charging frequency and customer complaints about runtime.
Step-by-Step Decision Guide
Define the application and constraints
– Operational runtime target per use (hours). Example: single 8-hour conference shift vs. multi-day festival with daily recharge.
– Average and peak current draw. Measure or estimate actual current draw in prototype under representative operating conditions (count LEDs, MCU, BLE activity).
– Physical constraints: available cavity thickness, allowed footprint, weight budget.
– Environmental conditions: temperature extremes, expected duty cycles, storage before deployment.
Calculate required capacity
– Use Runtime (h) = Capacity (mAh) / Average Current (mA). Add 20–30% margin for aging, tolerance, and temperature.
– Example: For average current 15 mA and target runtime 8 h → required capacity = 15 mA × 8 h = 120 mAh. Add 25% margin → select ~150 mAh nominal (closest standard: 200 mAh or accept 120 mAh if margin can be reduced).
Consider charge infrastructure and time
– If overnight charging only, a slower charge is acceptable. If fast turnaround is required, ensure charging current supports recharge within available window.
– Charge time (h) ≈ capacity (mAh)/Icharge ×1.1. For 200 mAh at 50 mA → ≈ 4.4 h.
Select cell and protection
– For single-cell embedded badges, include a protection circuit (overcharge, overdischarge, short-circuit) or integrate protection at device level.
– Verify protection thresholds: charge cut-off ~4.2 ±0.05 V, discharge cutoff ~2.5–3.0 V.
Mechanical integration
– Confirm cell dimensions against housing. Allow for thermal expansion and adhesive thickness. Plan flex tails or PCB pad locations.
– Design battery compartment to allow safe removal if needed and to prevent puncture.
Supplier and testing
– Source samples from at least 3 suppliers: Tier‑1 (for consistency/certification) and two alternative factories (price flexibility).
– Require batch test reports for capacity, internal resistance, and visual inspection.
– Test prototypes in environmental chambers (temp/humidity) and conduct cycle tests (e.g., 300 cycles).
Regulatory and shipping considerations
– For cells shipped separate from equipment: supplier must provide UN38.3 test reports. For air shipment, be prepared to ship at <30% SOC for passenger aircraft depending on logistics.
– For finished badges with batteries installed: device-level testing (IEC 62133) and labeling required.
Scale-up and QA
– Define acceptance criteria (capacity tolerance ±10%, ESR limit).
– Insist on sample retention, 10% first-article inspection on initial batches, and periodic re-sampling (AQL framework).
– Include warranty, failure rate targets (e.g., <1% DOA, <2% field failures in year 1), and end-of-life handling instructions.
Pricing and Cost Analysis
Direct cell cost (indicative ranges at B2B volume; final pricing depends on MOQ, contract terms, and supplier):
– 80 mAh cell: $0.30–$0.70 per cell
– 120 mAh cell: $0.45–$1.00 per cell
– 200 mAh cell: $0.80–$2.00 per cell
Pack-level cost (cell + protection PCB + assembly + wires/connector):
– 80 mAh pack: $0.60–$1.20
– 120 mAh pack: $0.90–$1.80
– 200 mAh pack: $1.50–$3.50
Cost-per-runtime-hour example (assume cell-only cost for simplicity)
– Scenario: constant 20 mA draw.
– 80 mAh: runtime 4 h. If cell cost $0.50 → $0.50/4 h = $0.125/hour
– 120 mAh: runtime 6 h. If cell cost $0.80 → $0.80/6 h = $0.133/hour
– 200 mAh: runtime 10 h. If cell cost $1.50 → $1.50/10 h = $0.15/hour
Interpretation:
– Cost/hour is often similar across capacities; larger cells shift cost to the device upfront but reduce charging logistics and user complaints.
– Total Cost of Ownership (TCO) should include replacements, logistics for recharge, warranty claims, and shipping costs.
Logistics and shipping cost impact
– Heavier/bulkier batteries increase shipping cost per unit and may change shipping class (air vs sea) and handling requirements.
– For international shipments, ensure UN38.3 documentation and classify as ‘batteries contained in equipment’ or ‘batteries packed with equipment’ correctly to avoid air-shipment penalties.
Packaging and warranty provisioning
– Include adequate bubble/foam padding to avoid mechanical damage in transit; cost per unit for protective packaging can be $0.02–$0.10 depending on volume and method.
– Build warranty into cost model: a 1–2% failure warranty reserve is common in procurement budgets for consumer wearables.
Negotiation levers with suppliers
– Higher MOQs, multi-year contracts, and agreed inspection plans reduce per-unit price.
– Request lead-time guarantees and penalties for missed delivery for large event orders.
Competitive Landscape
Supplier types
– Tier 1 global cell manufacturers: large, consistent quality, full certification set (Panasonic, Samsung SDI, Sony/Murata). These sources are preferred for strict compliance and predictable supply.
– Specialized pouch cell makers: common in China and Taiwan (EEMB, Sunwoda, Lishen, etc.). Competitive on price and flexible on custom form factors; quality varies by factory—require stronger QC and testing clauses.
– Battery pack assemblers and ODMs: companies that assemble cells with PCBs, tails, connectors, and provide certified packs. Useful when you need protection circuits and integrated charging ports.
– Contract manufacturers and turnkey badge OEMs: integrate battery, PCB, badge housing, and final testing.
Market dynamics
– Commodity price pressure from China-based manufacturers lowers cell cost but increases quality variance.
– Leading-brand cells carry premium but reduce QA overhead and shipment complications (certs, UN38.3).
– New entrants offering custom slim cells at similar capacities require due diligence on cycle life and aging.
How to evaluate suppliers
– Request on-file IEC 62133 and UN38.3 certificates for the cell model and batch-level test reports.
– Ask for process capability metrics (Cpk) for capacity and impedance.
– Inspect factory quality systems (ISO 9001, IATF where relevant) and sample lab testing SOPs.
– Negotiate reserve samples and third-party lab testing rights.
OEM integration considerations
– Some badge OEMs prefer to procure cells themselves; others prefer fully assembled battery packs to simplify assembly and compliance. Decide which model reduces your risk and manufacturing overhead.
What Buyers Say
Common feedback from bulk buyers of badge batteries:
– Runtime routine matches calculations if average current is accurately measured. Many buyers underestimate average LED duty cycle, causing underpowered designs.
– Swelling complaints correlate with slow/poor charging circuits and high ambient temperatures during storage/shipping.
– Price vs reliability: cheaper cells acceptable for single-use events; reusable, higher-value badges require Tier‑1 cells to reduce field failures.
– Protection circuits reduce returns but increase cost and thickness; balance based on use-case.
– Shipping headaches: lacking UN38.3 docs delays cross-border shipments. Buyers prefer suppliers providing full documentation with every shipment.
– Prototype mismatches: pockets designed to fit 80 mAh often cannot accept last-minute upgrades to 200 mAh without redesign.
Buyer tips
– Prototype with the expected LEDs and MCU and measure runtime; use the measured average current for final capacity selection.
– For events, start with a 20–30% safety margin on capacity to account for aging and temperature.
– Run a 100-cycle accelerated test to validate runtime degradation and swelling behavior before large orders.
Safety, Maintenance and Compliance
Safety requirements
– Cells and packs must pass UN38.3 test sequence to be legal for air transport. Ensure supplier provides UN38.3 test reports for the specific part number.
– IEC 62133 is the primary safety standard for portable cell/battery packs (requirements for overcharge/over-discharge protection and cell construction).
– For EU market, compliance with RoHS and CE requirements for finished product (EMC, low-voltage directives where applicable).
Protection recommendations
– Include a protection circuit module (PCM) with thresholds:
– Charge cut-off: 4.20±0.05 V
– Discharge cut-off: 2.5–3.0 V depending on system tolerance (recommend 2.8–3.0 V to prolong life)
– Overcurrent/short-circuit trip: defined by your device peak current and desired safety margin
– Add a thermistor (NTC) near cell for charge temperature monitoring.
Charging parameters
– Use CC–CV charger: charge to 4.2 V, current 0.2 C recommended, termination current 0.05 C.
– Recommended maximum continuous charge current should be confirmed with supplier. Avoid high-rate charging unless cell spec explicitly allows it.
Storage and maintenance
– Store cells at 20–25°C and ~30–50% SOC for long-term storage. Highest longevity achieved around 40% SOC.
– Avoid storage >45°C or <0°C. High temperature speeds degradation and risk of swelling.
– Regular maintenance cycles for long-term deployed badges: monthly top-up if stored charged.
Failure modes and mitigation
– Swelling (gas generation): caused by overcharging, deep discharge, high-temperature storage. Implement protection circuits and charging temperature controls.
– Capacity fade: expected over cycles; design with margin.
– Mechanical damage: pouch cells are puncture sensitive. Use recesses and reinforcement in housing design.
Shipping and legal
– For shipping batteries alone, follow IATA lithium battery provisions, which may require cells to be discharged to 30% SoC for passenger aircraft.
– Classify shipments correctly: “batteries packed with equipment” vs “contained in equipment” vs “standalone cells”.
– Obtain Material Safety Data Sheet (MSDS) and transport declarations from supplier.
Disposal and recycling
– Provide end-of-life instructions with product: do not incinerate, return to local battery recycling programs or supplier take-back schemes.
– Plan for local battery recycling compliance in key markets (EU WEEE, etc.).
Frequently Asked Questions
Q: Are these cells rechargeable?
A: Yes. 80 mAh, 120 mAh and 200 mAh cells referenced here are rechargeable Li‑ion/Li‑polymer cells with nominal voltage ~3.7 V. They require CC–CV charging to 4.2 V and proper protection.
Q: Can I use a CR2032 instead?
A: CR2032 is a non-rechargeable 3 V coin cell. Although it has similar nominal mAh for low-drain, it has high internal resistance and performs poorly with LEDs or pulses. It is not rechargeable and unsuitable for reusable badge designs intended for nightly recharge.
Q: How do I estimate runtime?
A: Measure average current under realistic duty cycles. Use: Runtime (h) = Capacity (mAh) / Average current (mA). Add 20–30% margin for aging, temperature, and tolerance.
Q: What charge current should I use?
A: 0.2 C (capacity × 0.2) is conservative and safe. Example: 80 mAh → 16 mA. Use CC–CV to 4.2 V and terminate at ~0.05 C. If faster recharge is needed, consult supplier for allowable peak charge rates.
Q: Do I need a protection circuit?
A: Yes for safety and to meet IEC 62133. Overcharge, over-discharge and short-circuit protection is recommended for any battery integrated into a device.
Q: What environmental tests should I require from suppliers?
A: UN38.3 (transport), IEC 62133 (safety), RoHS, and batch-level capacity/impedance testing. For badges that ship worldwide, request documentation for each lot.
Q: How does temperature affect capacity?
A: Capacity decreases at low temperature (e.g., at 0°C effective capacity may drop 20–40%), and high temperatures accelerate aging and increase risk of swelling. Design for worst-case ambient conditions during events.
Q: How many cycles will the batteries last?
A: Typical cycle life for these small Li‑poly cells is 300–800 cycles to 80% capacity depending on depth of discharge, charge rate, and temperature. Conservative planning uses 300–500 cycles.
Q: What are typical failure rates?
A: Acceptable initial DOA rates in volume procurement target <1–2%. Field failure target for the first year often <2–3% for consumer-grade products; adjust expectations for single-use vs reusable badges.
Contact Toyvao
For supplier matching, RFQ support, sample testing coordination, and bulk procurement for event badge batteries, prepare the following information and submit via Toyvao’s contact form:
– Project description: badge type, expected production run (units), and deployment date.
– Electrical profile: average and peak current draw, duty cycle, and target runtime per charge.
– Mechanical constraints: maximum allowed cell dimensions (L×W×T) and available PCB space.
– Charging method: micro-USB, pogo pins, or batch charging dock; desired charge window (hours).
– Compliance requirements: markets (EU/US/Asia), required certificates (IEC 62133, UN38.3), and labeling needs.
– Packaging and delivery preferences: FOB/CIF terms, lead time, and preferred shipping method.
Visit Toyvao.com/contact to submit RFQ details and ordering specifications. Include prototype samples or CAD of the battery cavity if available. Toyvao will coordinate supplier quotes, compliance documentation checks, and production test plans based on the requirements you supply.
