The CR=165 battery specification refers to a lithium manganese dioxide (Li-MnO₂) coin cell with 3V nominal voltage, where “CR” denotes the chemistry (Li-MnO₂), and “165” indicates a 16.5mm diameter and 5.0mm height. These batteries are designed for low-drain devices like calculators, key fobs, and medical implants, offering a typical capacity of 60–75mAh and a 10-year shelf life. Pro Tip: Avoid stacking CR=165 cells—parallel connections risk reverse charging and leakage.
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How is the CR=165 battery dimensionally standardized?
The CR=165 battery follows IEC 60086 standards: 16.5mm (±0.2mm) diameter and 5.0mm (±0.3mm) height. Its slim profile optimizes space-constrained applications, similar to watch batteries but with higher energy density. Pro Tip: Use a caliper to confirm sizing—mismatched dimensions can damage device terminals.
Beyond physical specs, the CR=165’s 3V output remains stable across 90% of its discharge cycle, unlike alkaline cells. For example, a garage door opener using CR=165 will maintain reliable signal transmission even in sub-zero temperatures. Why does this matter? Consistent voltage prevents device malfunctions in critical applications like pacemakers. Mechanically, the stainless steel casing ensures leak resistance, while the passivated anode minimizes self-discharge (<0.5% annually). Transitioning to real-world use, these cells outperform BR-type counterparts in moderate climates but struggle above 60°C. Think of them as marathon runners—steady but not built for extreme sprints.
| Feature | CR=165 | CR2032 |
|---|---|---|
| Diameter | 16.5mm | 20mm |
| Height | 5.0mm | 3.2mm |
| Capacity | 75mAh | 225mAh |
What devices commonly use CR=165 batteries?
The CR=165 battery powers compact electronics requiring stable low-current draw—think glucometers, LED thermometers, and RFID tags. Pro Tip: Replace these cells every 2–3 years in medical devices, even if unused, to avoid risks.
Practically speaking, CR=165’s 0.1mA–2mA discharge range suits devices where battery swaps are infrequent. A car key fob, for instance, might last 5 years on a single cell. But what happens if you use a CR1620 instead? Though voltage-compatible, its lower capacity (60mAh vs. 75mAh) reduces operational life by 20%. Transitioning to industrial uses, these batteries excel in wireless sensors for HVAC systems due to their -30°C to 60°C operating range. However, avoid pairing them with high-drain gadgets like cameras—they’ll deplete rapidly, sometimes within hours. Imagine using a bicycle for a cross-country truck haul—it’s mismatched for the load.
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How does temperature affect CR=165 performance?
CR=165 batteries operate optimally between -30°C and 60°C, but capacity drops by 25% below -10°C. Pro Tip: Store spares at room temperature—heat accelerates self-discharge by 0.3% per degree above 25°C.
At -20°C, the electrolyte viscosity increases, slowing ion transfer and reducing usable capacity to ~45mAh. Conversely, desert heat (45°C+) causes internal pressure spikes that can rupture seals. For example, a GPS pet tracker left in a parked car on a 38°C day might suffer battery swelling, compromising water resistance. Why risk it? These cells aren’t designed for rapid discharge or extreme environments. Transitioning to solutions, devices used in arctic conditions often switch to BR chemistry (handling -40°C), albeit with a 15% lower nominal voltage. It’s like choosing snow tires over all-seasons—specialized but situationally critical.
CR=165 vs. SR60: Which is better for watches?
CR=165 batteries provide 3V and 75mAh, while SR60 (silver oxide) offers 1.55V with 60mAh. Pro Tip: Voltage mismatch can fry 1.5V devices—always check manufacturer specs.
Though CR=165 has higher energy density, most analog watches require SR60’s stable 1.55V to prevent motor overdrive. For example, substituting CR=165 in a Seiko watch might accelerate timekeeping by 18% due to doubled voltage. Why would manufacturers specify SR60 then? Silver oxide cells maintain near-flat voltage until depletion, unlike lithium’s linear drop. It’s akin to using diesel in a gasoline engine—compatible in a pinch but ill-advised long-term. Transitionally, CR=165 suits digital watches with voltage regulators, but mechanical timepieces need precise 1.5V systems.
| Parameter | CR=165 | SR60 |
|---|---|---|
| Chemistry | Li-MnO₂ | Ag₂O |
| Voltage | 3V | 1.55V |
| Cost | $1.50 | $2.00 |
Can CR=165 batteries be recharged?
CR=165 batteries are non-rechargeable primary cells. Attempting to recharge them risks thermal runaway and electrolyte leakage. Pro Tip: Use LiFePO4 rechargeables if frequent swaps are needed—they offer 500+ cycles at 3.2V.
Lithium manganese dioxide chemistry lacks the structural stability for reversible ion intercalation. Applying even 5V @ 10mA can cause pressure buildup, potentially rupturing the casing within 15 minutes. For instance, a DIY recharge attempt on a CR=165 used in a digital caliper might lead to corrosive potassium hydroxide leaks, destroying the device. Why take the chance? Transitioning to alternatives, Li-ion coin cells like LIR1654 provide similar dimensions with 80mAh capacity and rechargeability, but require specialized 3.6V chargers. It’s like converting a paperback into an e-book—same content, different delivery mechanism.
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FAQs
No—CR1620 is thinner (16×2.0mm) with 60mAh capacity. Forced installation can loosen terminal contacts, causing power dropouts.
What’s the shelf life of CR=165 batteries?
Up to 10 years when stored at 20°C and ≤60% humidity. Avoid refrigeration—condensation degrades seals.
