Executive Summary

This guide compares three common rechargeable pouch-cell capacities used in electronic badge pins — 80 mAh, 120 mAh and 200 mAh — and provides a framework for selecting the right battery for product requirements, cost targets and regulatory needs. Key conclusions:

• Capacity vs. size trade-off is primary. 80 mAh minimizes thickness and cost but limits runtime to hours under moderate loads. 120 mAh is the typical compromise for day-long use in many LED badge pins. 200 mAh is recommended when continuous multi-hour operation, BLE connectivity, or high-duty light patterns are required.
• For typical LED badge designs, estimate runtime from average current, not peak pulses. Use real measured average current (mA) to compute hours = capacity (mAh) / average current (mA), then apply 70–85% usable capacity for practical CC/CV behavior and headroom for aging.
• Battery chemistry and protection are critical. Single-cell Li‑Po (nominal 3.7 V, charge 4.2 V) is standard. Add a protection PCB for overcharge/overdischarge, a proper charging IC (TP4056 / MCP73831 class), and consider a fuel gauge for BLE-enabled or smart badges.
• Cost impact: at scale, cell price difference between 80 mAh, 120 mAh and 200 mAh typically accounts for $0.10–$1.00 per unit; protection PCBs, connectors and chargers add $0.05–$0.50. Total BOM delta must be measured against product margin and expected return rates.
• Safety & compliance: require UN38.3 test reports, IEC62133 certification for batteries sold into regulated channels, RoHS and MSDS. Implement acceptance tests: capacity, internal resistance, short/visual inspection. Plan shipping as dangerous goods.

This guide provides practical calculations, test points, procurement checklists and vendor negotiation guidance to choose between 80/120/200 mAh cells for electronic badge pins.

What Is [Product] and Who Uses It

Electronic badge pins are wearable devices (conference badges, event passes, staff IDs, promotional pins) that include LEDs, microcontrollers, RF (Bluetooth Low Energy), sensors or simple light effects. The battery is the energy source powering:

• RGB or single-color LEDs with resistors or LED drivers
• Microcontrollers (8-bit MCUs, ARM Cortex-M0/M0+, or dedicated LED driver ICs)
• BLE modules (nRF52 series, Dialog, etc.) in smart badges
• Sensors or small vibration motors in advanced badges

Primary users and buyers:

• OEMs and ODMs that embed batteries into badges for events, promotions and uniform IDs.
• EMS and contract manufacturers responsible for assembly and testing.
• Event producers requiring single-use or multi-day deployments.
• Distributors and resellers sourcing private-label badges.

Common badge constraints:

• Form factor: thickness often 3–8 mm total; battery thickness must fit inside the housing.
• Weight sensitivity: badges must be light to avoid tearing clothing.
• Runtime: from several hours (evening events) to multi-day operation (conferences).
• Cost sensitivity: unit costs must stay low given high-volume, low-margin products.

Typical battery choice: lithium polymer single-cell pouch 3.6–3.7 V nominal with capacities in the 80–200 mAh range. These deliver higher energy density than coin cells for the same volume and are rechargeable via simple USB chargers.

Why Demand Is Growing

Three drivers increase demand for optimized badge batteries:

• Function complexity: badges now regularly include RGB LEDs, BLE, sensors and interactivity — increasing average energy consumption.
• Reuse & sustainability: organizers prefer rechargeable badge systems to reduce waste and operating cost versus single-use CR2032 coins.
• User expectations: longer runtimes for day-long events and multi-day conferences; immediate full-bright patterns during social events.

Market effects:

• More smart badges require slightly larger capacities (120–200 mAh) to support BLE advertising and occasional peaks.
• Cost-sensitive promotional badges still push 80 mAh where runtime is limited or fallback charging stations exist.
• Supply chain attention increases due to transport regulations for lithium cells and global capacity constraints affecting lead times and MOQ.

Operational impact:

• Buyers must balance runtime requirements against form factor and cost.
• Larger capacities increase shipping constraints (UN/ICAO/IATA) and per-unit battery handling costs.
• Testing and quality control become non-negotiable as batteries are a frequent failure mode causing returns and safety incidents.

Key Technology Differences

Chemistry and cell type:
– Li‑Po pouch (Lithium-ion polymer): Nominal 3.6–3.7 V, charge voltage 4.20 V, widely used for low-profile wearable batteries.
– Li‑ion cylindrical or prismatic cells: uncommon in badge pins due to thickness and shape.
– Coin cells (CR2032): 3.0 V nominal and often 200–240 mAh, non-rechargeable — suitable for ultra-low-power badge designs but not for rechargeable workflows.

Key battery specifications and their effect:

• Capacity (mAh): Energy stored. Primary determinant of runtime. Energy (mWh) = mAh × nominal voltage (3.7 V). Usable capacity is less than rated due to CC/CV charge profile and recommended protection cutoff.
• Internal Resistance (mΩ): Affects voltage sag under load and heat generation during pulses. Higher resistance reduces effective power to LEDs and increases heat under high pulse loads.
• C-rate (discharge/charge): Typical 0.5–1C continuous recommended for these cells. High-peak pulses (2–5C) tolerated for short durations depending on supplier specs.
• Cycle life: Typically 300–800 cycles to 80% capacity depending on chemistry, depth-of-discharge (DoD) and temperature.
• Protection PCB: Adds overcharge, overdischarge and short-circuit protection. Recommended for consumer/end-user devices to reduce safety risk.
• Charge method: Constant current / constant voltage (CC/CV) with termination current. Charging at 0.5C to 1C is common; lower currents increase battery life.

Electrical behavior and practical consequences:

• Usable capacity vs. rated: Under typical CC/CV charging, end-to-end usable is ~85–95% initially; after aging and to protect battery life, designers should budget ~70–85% usable capacity for runtime calculations.
• Pulsed loads: LEDs with PWM or flash patterns produce high peak currents and low average current. Sizing should be based on average current, but check voltage sag during peaks (internal resistance).
• Voltage curve: Li‑Po voltage drops slowly from 4.2 V to ~3.75 V through most of the discharge, then steeply from ~3.75 V to cutoff (~3.0–3.2 V depending on protection). Choose voltage-sensitive drivers or buck-boosts accordingly.

Mechanical integration:

• Pouch cell thickness and form factor vary. 80 mAh cells are typically thinner and lighter; 200 mAh requires more area and thickness.
• Connector options: solder tabs, wire leads, or micro JST 2-pin connectors (JST-PH common in badges). Consider serviceability vs. permanent assembly.

Key Features and Specifications to Evaluate

When selecting between 80, 120 and 200 mAh cells, evaluate the following measurable attributes. Request datasheets and test reports from suppliers for each point.

• Rated capacity (mAh): 80 ±5%, 120 ±5%, 200 ±5%. Confirm test conditions (0.2C, 20–25°C).
• Nominal voltage: 3.6–3.7 V.
• Charge voltage: 4.20 V ±0.05 V.
• Recommended charge current: specify max (mA) and recommended (mA). Example: max 1C, recommended 0.5C.
• Discharge cut-off voltage: typically 2.75–3.0 V (protection PCBs often set ~2.5–3.0 V).
• Internal resistance (mΩ): provide typical and maximum. Lower is better for pulse loads; typical small pouch cells are 150–600 mΩ depending on capacity.
• Cycle life: number of cycles to 80% capacity at specified DoD (e.g., 300 cycles at 80% DoD).
• Dimensions and weight: width × height × thickness (mm) and grams. Provide tolerance e.g., ±0.5 mm, ±0.2 g.
• Connector/type of termination: tabs, wires, JST-PH. Stated recommended soldering method and max temperature.
• Protection PCB included (yes/no): include specs for over-current, over-voltage and over-discharge thresholds.
• Operating temperature range: discharge and charge temperature limits (e.g., charge 0–45°C, discharge -20–60°C).
• Storage: storage voltage recommended (3.7–3.9 V) and self-discharge rate (% per month).
• Regulatory compliance: UN38.3, IEC62133, RoHS, MSDS availability.
• Pack/labeling: Cell-level labels, lot numbers, date codes.
• Warranty terms and MOQ: min order quantities, lead times, batch traceability.
• Sample policy and testing support: free/paid samples, recommended acceptance tests and how supplier supports QC.

Pros and Cons

Compare 80 mAh, 120 mAh and 200 mAh cells across critical parameters.

80 mAh
– Pros:
– Smallest thickness and lowest weight (typical weight 3–4 g).
– Lowest cost per unit; lowest BOM volume and assembly footprint.
– Fits into very thin badge enclosures (3–5 mm available depth).
– Shorter charge time at modest charge currents.
– Cons:
– Limited runtime. Under 20 mA average load, runtime ≈ 4 hours (80/20).
– Less tolerant of high peak/pulse currents due to higher internal resistance often.
– Lower usable capacity as cell ages faster under deep discharges if used daily.
– May require more frequent charging cycles impacting logistics.

120 mAh
– Pros:
– Balanced compromise between runtime and size; typical weight 4–7 g.
– Good for half-day to full-day events with moderate LED use and MCU/BLE intermittency.
– Better tolerance for pulses and lower internal resistance vs 80 mAh.
– Cons:
– Slightly higher cost and thicker profile.
– If extreme runtime is needed (multi-day or heavy BLE), still might be insufficient.

200 mAh
– Pros:
– Longest runtime (approx 10+ hours at 20 mA average load: 200/20 = 10 h).
– Better for BLE-enabled smart badges or badges with continuous illumination.
– Lower internal resistance in many designs, better performance with high pulses.
– Cons:
– Largest size and weight (typical 7–12 g); may force thicker/more robust housing and stronger badge pin hardware.
– Highest per-unit cost and increased shipping/handling regulation attention.
– Longer charge time; may require higher current chargers to keep charging speed acceptable.

Common cons across all Li‑Po cells:
– Require CC/CV charging and safety features.
– Subject to transport regulations and handling considerations.
– Quality variability across suppliers; requires incoming inspection.

Step-by-Step Decision Guide

Use this step-by-step process to select the right battery capacity and supplier for a badge pin program.

1. Define required runtime and operating profile
2. Measure or estimate average current draw under realistic use (include idle, active, LED duty cycles, BLE advertising, MCU sleep).
3. Target runtime for the use case (hours of continuous operation or days with intermittent use).

4. Example: for an evening event with heavy LED flashing and no BLE, target 6–8 hours. For BLE-enabled staff badges, target 10–16 hours or 48-hour standby with duty-cycled advertising.

5. Measure or estimate average current correctly

6. Use a current probe or high-resolution DMM logging. Account for peak pulses and PWM.
7. Compute average current = (sum of instantaneous currents × time) / total time.

8. Add a 20–30% margin to account for aging, cold temperatures and battery tolerances.

9. Convert average current to required capacity

10. Raw formula: required_capacity_mAh = average_current_mA × required_runtime_hours.
11. Apply usable capacity factor: divide by usable fraction (typical 0.75 for design margin).

12. Example: average current 12 mA, runtime 10 hours -> raw capacity 120 mAh; design capacity = 120 / 0.75 = 160 mAh → pick 200 mAh cell.

13. Check form factor constraints

14. Confirm available internal volume and maximum cell thickness. Evaluate cell dimensions and tolerances.

15. If 200 mAh does not fit mechanically, evaluate redesign housing or accept 120 mAh with charging stations.

16. Evaluate charging strategy and infrastructure

17. Decide whether badges will be returned for charging, charged in-field via USB hubs, or supplied with charging docks. Match charger current to cell (e.g., 0.5C for longevity).

18. If using shared charging racks, implement connector and cable standardization.

19. Safety & compliance requirements

20. Require UN38.3 and IEC62133 certification if selling into regulated markets.
21. Specify required protection PCB settings (over-current, over/under-voltage thresholds).

22. Define acceptance tests and AQL.

23. Supplier selection and qualification

24. Request datasheets, cell samples, UN38.3 report, IEC62133 report and test reports for cycle life.
25. Perform incoming QC: capacity test at 0.2C, internal resistance, visual inspection, tab strength.

26. Start with a pilot order (100–500 units) for field testing.

27. BOM, cost and logistics balancing

28. Include protection PCB, connector, adhesive and assembly cost when comparing cells.
29. Factor shipping (dangerous goods), customs, and inventory holding costs.

30. Negotiate price breaks at relevant volumes (1k, 5k, 10k units).

31. Long-term field monitoring

32. Track returns/field failures and cycle counts. Use battery telemetry or review failure trends to refine capacity and supplier choice.

33. Contingency & end-of-life

34. Plan spare stock for returns and spares (2–5% buffer).
35. Provide instructions for safe disposal and recycling channels; include handling instructions on packaging.

Pricing and Cost Analysis

Estimate per-unit cost components for a badge BOM using 80/120/200 mAh cells. Prices vary widely by supplier, brand, certification and volume. The following are indicative bulk price ranges (FOB China) for basic pouch cells with UV-printed labels at MOQ 1,000–5,000:

• 80 mAh cell: $0.20 – $0.45 each
• 120 mAh cell: $0.35 – $0.70 each
• 200 mAh cell: $0.60 – $1.20 each

Add-on costs:
– Protection PCB (single-cell): $0.04 – $0.25 depending on protection features and volumes.
– JST-PH or wire-lead termination: $0.03 – $0.12.
– Assembly (placement, soldering/welding): $0.05 – $0.20 per unit.
– Shipping & handling (compliant DG packaging, air freight surcharges): $0.02 – $0.25 per unit depending on volume and destination.
– Testing/inspection per batch: $0.01 – $0.05 per unit if amortized.

Total incremental BOM difference (illustrative):
– 80 mAh assembled battery (cell + protection + connector + assembly): approx. $0.40 – $0.90
– 120 mAh assembled: approx. $0.60 – $1.20
– 200 mAh assembled: approx. $0.90 – $1.80

Pricing levers:
– MOQ: prices drop significantly over 10k–50k units.
– Certification level: cells pre-tested with IEC62133 will cost more but simplify compliance.
– Branding and custom ICS: printing, custom connectors and packaging increase unit price.

Return-on-investment analysis:
– Compare increased battery cost to customer satisfaction, reduced returns, and avoided staffing/logistics costs for recharging.
– Example calculation: If 200 mAh increases unit cost by $0.80 vs 120 mAh but reduces field returns and recharging logistics by $1.50 per unit across a campaign, the larger cell is justified.

Competitive Landscape

Supplier types and considerations:

• Tier-1 manufacturers: EVE, Sunwoda, BAK, ATL-like companies produce high-quality cells, support certifications and volume supply. Higher cost, reliable documentation.
• Mid-tier factories: Medium-quality cells with reasonable prices; QC variability requires acceptance testing.
• Trading companies / brokers: Provide convenience on small MOQ and variety but limited technical support and variable authenticity.
• ODMs and battery module suppliers: Offer assembled batteries with protection PCB, connector and custom cable harness. Good for turnkey badge production.

What to ask suppliers:
– Provide cell datasheet, UN38.3 and IEC62133 reports, batch cycle test results and test conditions.
– Request sample serial numbers and certificate cross-checks.
– Provide references for past badge/ wearable customers or product photos of similar integrations.

Quality traps:
– False certification documents. Always verify reports with issuing lab and cross-check lot numbers.
– Re-labeled cells: internal chemistry and performance may not match printed specs.
– Lead-time variability: battery supply often has 6–12 week lead times for certain capacities and custom labels.

Procurement negotiation tips:
– Negotiate for samples and small pilot runs; include acceptance criteria in purchase orders.
– Build a multi-source strategy: primary supplier for large volumes, secondary with compatible specs.
– Insist on lot traceability, date codes and MSDS.

What Buyers Say

Based on aggregated feedback from badge manufacturers and event operators:

• 80 mAh is chosen for ultra-thin novelty badges and single-evening events. Complaints: inadequate runtime when organizers miscalculate LED duty cycles; swells on low-cost cells after repeated deep discharge.
• 120 mAh is most frequently chosen for general-purpose badges. Buyers cite acceptable runtime (6–10 hours) and manageable form factor. Common advice: include protection PCB and a conservative discharge cutoff in firmware to avoid deep discharge.
• 200 mAh is recommended for BLE-enabled or continuous-light badges. Buyers accept the weight/size penalty for reliable day-long operation. Complaints relate to higher cost and occasionally thicker housings requiring redesign.
• Recurring issues reported:
• Inconsistent labeling and capacity mismatch on cheaper suppliers.
• Cells shipped without protection PCBs cause failures during assembly/testing.
• Under-spec internal resistance causing LED flicker under pulses.
• Shipping delays and customs clearance for batteries without correct documentation.

Buyer best practices:
– Always measure average current in real scenario before ordering.
– Request a 10–50 unit pilot batch to test aging, charge cycles and real-world behavior.
– Enforce supplier-supplied QC certificates and independent lab verification for safety tests.

Safety, Maintenance and Compliance

Mandatory and recommended practices:

Regulatory requirements:
– UN38.3: mandatory for air transport. Request test report and certificate for specific cell lot when possible.
– IEC62133: recommended/required for many markets and OEM customers (battery safety standard for portable sealed secondary cells containing alkaline or other non-acid electrolytes).
– RoHS/REACH: request declarations of conformity.
– MSDS: chemical safety data sheet must be available for warehousing, handling and emergency response.

Design for safety:
– Protection PCB: include overcharge (≤4.30–4.30 V cutoff), overdischarge (≤2.5–3.0 V cutoff), and short-circuit protection. Select protection thresholds consistent with charger and MCU firmware.
– Charge safety: use CC/CV chargers and limit charge current to recommended 0.5C where long life is required. Implement thermal monitoring if badges charge unattended.
– Physical assembly: use tab welding or recommended soldering methods. Avoid excessive heat on tabs and use strain relief for wires.
– Venting and housing: provide vent path in assembly if worst-case cell failure occurs (pouch cells can delaminate and swell).

Incoming inspection and acceptance testing:
– Sample plan: use lot-based acceptance sampling (e.g., AQL 1.5 for electrical/visual). Increase sampling for cheaper suppliers.
– Tests to perform on incoming lots:
– Capacity test at 0.2C to rated capacity tolerance.
– Internal resistance measurement.
– Visual inspection for swelling, delamination, tab integrity and labels.
– Charge/discharge cycle test on a subset (e.g., 5–10 cells for 30 cycles) to spot short-term failures.
– Record lot numbers and maintain traceability.

Storage and handling:
– Store at 30–60% state of charge recommended (3.7–3.9 V per cell) for prolonged storage.
– Temperature: 15–25°C recommended for maximizing shelf life; avoid >40°C.
– Avoid mechanical stress on pouch cells; pouch puncture is hazardous.

End-of-life and recycling:
– Provide end-of-life guidance: return to collection centers, certified recyclers. Do not throw Li‑Po cells within municipal waste.
– Track disposal documentation for large events; composting is not applicable.

Emergency procedures:
– For swelling: move cell to non-flammable surface in ventilated area and isolate until it cools. Do not puncture or charge.
– Fire: Class D chems; use appropriate extinguishers and trained personnel. Provide local guidance and MSDS to event staff.

Frequently Asked Questions

What is the usable capacity I can count on in the field?
– Design conservatively: assume 70–85% usable capacity due to CC/CV charging, aging and temperature. Example: a 200 mAh cell realistically yields 140–170 mAh usable for guaranteed runtime calculations.

Can I use CR2032 coin cells instead of these Li‑Po cells?
– Only for ultra-low-power designs. CR2032 is 3 V nominal and often rated ~200–240 mAh at very low discharge rates. Not rechargeable; unsuitable for rechargeable workflows. Voltage falls off faster and internal resistance is high, reducing LED brightness under load.

Is a protection PCB required?
– Strongly recommended for consumer devices. Protection circuits reduce risk of over-discharge, overcharge and short-circuit. For employer-owned systems with controlled charging, some OEMs use unprotected cells to save space/cost, but that increases risk and liability.

How fast can I charge these cells?
– Typical recommended charge current is 0.5C. For 80 mAh -> 40 mA recommended; 120 mAh -> 60 mA; 200 mAh -> 100 mA. Higher charge currents up to 1C are possible but accelerate wear and raise thermal considerations. CC/CV charging profile adds ~20% overhead to charge time.

How do I calculate battery runtime with pulsed LEDs?
– Convert duty-cycled pulses to average current. Example: LED pulses 100 mA for 100 ms every 1 s -> average LED current = 100 mA × 0.1 = 10 mA. Add MCU and BLE average currents to compute total average current.

What inspections should I require from suppliers?
– UN38.3 and IEC62133; capacity test conditions; internal resistance; visible mechanical tolerances; protection PCB test report; lot-based sampling plan.

What packaging and shipping issues do I need to consider?
– Lithium batteries are dangerous goods for air freight. Classify shipments correctly, use appropriate UN numbers and DG paperwork. If cells are inside equipement (battery installed in device) different rules apply — check IATA and local regulations.

How does temperature affect runtime?
– Capacity drops with temperature; expect ~10–20% capacity loss at 0°C vs 25°C for Li‑Po. At -20°C losses grow and internal resistance increases; plan allowances or heating if needed.

What is typical cycle life?
– Expect 300–800 cycles to 80% capacity depending on DoD and charge current. Shallow cycles and lower charge currents extend life.

Contact Toyvao

For procurement support, sample requests, MOQ and custom assembly options, contact Toyvao sales:

• Email: sales@toyvao.com
• Website: https://www.toyvao.com/contact
• Phone: +86- (available on request via email) — include order volume and required specifications for a faster response

State these items when contacting:
– Target capacity (80 / 120 / 200 mAh) and cell dimensions required
– Protection PCB requirements and connector type
– Certifications required (UN38.3, IEC62133, RoHS)
– Target annual volume and desired lead times
– Any custom printing, labeling or packaging requirements

Toyvao can assist with supplier qualification, sample testing, custom assembly, and compliance documentation for battery-integrated badge programs.