LiHV Battery Disclaimer (4.35V LiPo Safety & Usage Guide)

LiHV Battery Disclaimer & Usage Guide

Required reading for all 4.35V High Voltage Lithium Polymer (LiHV) battery purchases.

⚠️ Warning:
LiHV batteries are high-performance packs intended for experienced users only. These are not standard LiPo batteries. Improper setup, charging, or operation can cause overheating, permanent battery damage, shortened cycle life, fire, property damage, or personal injury.

Who These Packs Are For

SMC HCL-HV 4.35V LiHV batteries are designed for users who understand how to manage high-power, low-weight flight packs in demanding RC applications. These packs are commonly used in high-performance EDF and 3D aircraft where maximizing power density and minimizing weight matter.

If you are unfamiliar with LiHV charging, voltage monitoring, battery temperature management, or setup tuning, you should choose a standard 4.20V LiPo pack instead.

What Makes LiHV Different

  • Higher maximum charge voltage: 4.35V per cell
  • Higher power output for the same weight
  • Greater sensitivity to heat and voltage management
  • Can deliver outstanding performance, but with less margin for user error
There is no free lunch.
The performance benefit of LiHV comes with stricter operating requirements. Higher output and lower pack mass can also mean higher temperatures if the pack is pushed too hard or managed poorly.

Critical Rule: Heat Is the Enemy

Over-temperature is the mortal enemy of all LiPo batteries, especially high-performance LiHV packs.

  • If you cannot grip the battery tightly for 30 seconds immediately after a flight, it is too hot.
  • If the pack is too hot to comfortably handle, damage has likely occurred.
  • Even if a pack still works, overheating can permanently reduce cycle life.

If your pack is overheating, reduce load, reduce flight time, improve cooling, adjust gearing or head speed, or switch to a non-HV battery. If you cannot achieve acceptable temperatures, LiHV is not the right fit for your setup.

Voltage Management Matters

Many users blame load alone for battery heat, but poor voltage management is often the real cause.

  • Avoid letting pack voltage drop below approximately 3.56V per cell under load.
  • LiHV packs can continue performing at a high level while being damaged.
  • This can mask abusive operation and lead users to wrongly blame the battery.

You are responsible for monitoring battery temperature, flight time, and voltage behavior in your application.

Power Output, Throttle, and Setup Reality

LiHV batteries can produce a higher sustained power output than standard packs. In some setups, that extra output turns into useful performance. In others, it simply turns into extra heat.

  • Small speed gains often require disproportionately more power.
  • Throttle curves are often not linear.
  • What appears to be 75% throttle may be much closer to 90% actual power output.
  • Inefficient or draggy airframes can consume significantly more power without much performance gain.

The result is simple: a LiHV battery may be delivering more power than your setup can efficiently use, causing the pack to run hot and wear out faster.

Charging & Storage

  • Use a charger with LiHV mode support.
  • Maximum charge voltage is 4.35V per cell.
  • Recommended charge rate is 1C.
  • Charge rates above 1C may reduce lifespan and reduce usable capacity over time.
  • Long-term storage voltage is approximately 3.80V to 3.84V per cell.
  • Short-term storage as low as 3.70V per cell is acceptable.
  • Do not leave any LiPo or LiHV battery fully charged for more than 24 hours unless absolutely necessary.

Recommendation for First-Time LiHV Buyers

If you are new to LiHV batteries, start with one or two packs only. Test them in your intended application and monitor temperature, performance, and long-term hold-up over multiple cycles.

If the packs stay cool, do not expand, and maintain performance, then purchase more. If they do not hold up well in your setup, switch to SMC HCL-HP non-HV flight packs instead.

Purchaser Acknowledgment

By purchasing LiHV batteries from New England RC LLC, you acknowledge and agree that:

  • You understand LiHV batteries are high-performance products requiring proper setup, charging, and monitoring.
  • You understand excessive heat, improper charging, over-discharge, and misuse can permanently damage cells.
  • You are solely responsible for ensuring the battery is appropriate for your application.
  • You assume all risk associated with use, charging, storage, and handling of LiHV batteries.
  • You have read and accepted this disclaimer before purchase.

Final Sale / Warranty / Liability

  • All battery sales are final.
  • Batteries are covered only under manufacturer warranty, if applicable.
  • New England RC LLC does not accept returns of used, damaged, overheated, puffed, over-discharged, or improperly handled batteries, except where required by law.
  • New England RC LLC assumes no liability for misuse, improper charging, incorrect configuration, unsafe handling, fire, property damage, injury, or losses arising from battery use.
New England RC LLC