Powerex Batteries

Powerex Batteries: Dependable NiMH Power and Smart Charging

Powerex focuses on NiMH rechargeable batteries and intelligent chargers that balance runtime, reliability, and total cost of ownership. Their AA/AAA lines include low self‑discharge cells for everyday use and high‑capacity PRO cells for demanding, high‑drain devices.

Product Line at a Glance

• Low Self‑Discharge AA/AAA (typically 2500–2600 mAh AA): Precharged, retain about 75–85% after one year, and offer up to ~1,000 cycles with moderate charge/discharge rates.
• Powerex PRO AA 2700 mAh: Maximum runtime and faster recycle for flashes, recorders, and LED panels; roughly ~500 cycles; performs in cold down to about −4°F (−20°C).
• Precharged 9V (9.6V nominal, ~230 mAh): Suited for wireless mic/bodypacks, instruments, and detectors; low self‑discharge design.
• Smart chargers: MH‑series models such as the MH‑C9000 Charger‑Analyzer (per‑cell control, capacity/health testing, break‑in and refresh) and MH‑C808M (bulk charging for AA/AAA/C/D; NiMH/NiCd).

How to Choose

• Choose Low Self‑Discharge AA/AAA if devices sit idle for weeks, you want up to ~1,000 cycles, and consistent performance across mixed usage.
• Choose PRO AA 2700 mAh if you need the longest runtime and high current bursts (camera flashes, LED lights, audio recorders) and can accept ~500 cycles.
• Choose 9V 9.6V NiMH for gear that specifies rechargeable 9V (audio packs, test gear). Always confirm your device supports NiMH 9V.
• Choose MH‑C9000 if you want precise, per‑slot charging, capacity testing, and maintenance modes.
• Choose MH‑C808M if you charge many cells at once or need C/D support in addition to AA/AAA.

Runtime Examples

Real‑world results vary by device and settings. Estimates assume ~80–90% usable capacity under load.

Device	Typical Draw	Battery	Approximate Runtime
LED headlamp (medium)	300 mA	AA 2600 mAh	7–8 hours
Game controller	100–120 mA	AA 2600 mAh	18–22 hours
Camera flash (full‑power pops)	Burst load	AA 2700 mAh PRO	~150–250 pops per set
Wireless mic bodypack	20–30 mA	9V 230 mAh	6–9 hours

Charging Time and Care

How long does charging take?

Approximate time (hours) ≈ capacity (mAh) ÷ charge current (mA) × 1.2. Examples:

• AA 2600 mAh at 1000 mA (1.0 A): about 3.0–3.5 hours
• AA 2700 mAh at 500 mA: about 6–6.5 hours
• 9V 230 mAh at 100 mA: about 2.5–3 hours

• Use NiMH‑compatible smart chargers with independent slots. Avoid Li‑ion or alkaline chargers.
• For longevity, charge at moderate rates (~0.3–0.5C). Ultra‑fast charging can increase heat and reduce cycle life.
• Keep matched sets together (same brand/capacity/age) for multi‑cell devices; label and rotate sets.
• If storing for months, keep cells cool and dry. Storing partially charged (about 40–60%) or fully charged is fine; top off every few months.
• Run a refresh/analyze cycle on a smart charger if capacity seems to drop or every few dozen cycles.

Pros and Cons

• Pros: High current output for flashes and audio gear; strong cold‑weather performance (PRO); low self‑discharge; reusable for hundreds of cycles; lower long‑term cost and waste.
• Cons: Nominal 1.2V per cell—some simple devices expect 1.5V and may show “low battery” early; high‑capacity cells tend to have fewer cycles and slightly higher self‑discharge than standard LSD cells.

Compatibility and Safety

• NiMH AAs/AAAs work in most devices that accept alkaline cells. A few products require 1.5V regulated output—check the manual.
• For smoke/CO alarms, follow the manufacturer’s guidance. If using rechargeable 9V, test monthly and replace on schedule.
• Do not short‑circuit, crush, or expose cells to heat. Recycle worn‑out batteries via local battery recycling programs.

Alternatives

For very infrequent or emergency‑only use, primary lithium AA offers long shelf life. If your device needs true 1.5V rechargeable output, consider regulated lithium‑based rechargeables approved by the device manufacturer.

FAQ

Do Powerex NiMH batteries suffer from memory effect?

NiMH has minimal memory effect in normal use. A refresh/analyze cycle on a smart charger can help restore performance if capacity drifts.

How many times can I recharge them?

Low self‑discharge AA/AAA can reach up to ~1,000 cycles under gentle use; high‑capacity PRO cells typically around ~500. Depth of discharge, heat, and charge rates affect lifespan.

Can Powerex chargers work with other brands?

Yes. Powerex smart chargers support most quality NiMH cells (and NiCd on compatible models). Follow the charger’s manual for settings.

What temperatures can they handle?

Powerex PRO AAs are rated for cold conditions down to about −4°F (−20°C). Avoid high heat during use, charging, and storage.

How should I recycle old batteries?

Use authorized battery recycling drop‑offs or municipal programs. Do not dispose of rechargeables in household trash.