Akai BPN300 Replacement Battery 6V 4200mAh Ni-MH
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Akai BPN300 Replacement Battery 6V 4200mAh Ni-MH - is backordered and will ship as soon as it is back in stock.
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Battery Care Tips
Battery Care Tips
🔹 Getting Started
Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.
🔹 Keep It Healthy
Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.
Delivery and Shipping
Delivery and Shipping
🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.
Disclaimer
Disclaimer
⚠️ Disclaimer: All product names, trademarks, and registered trademarks belong to their respective owners.
🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.
Akai BPN300 Replacement Battery 6V 4200mAh Ni-MH - is backordered and will ship as soon as it is back in stock.
Voltage
6V
Amp
4200mAh
Akai BPN300 / BPN350 Series — 6V Ni-MH Replacement Battery
This is a 6V 4200mAh Ni-MH battery for the Akai BPN300, BPN350, C20, PMVS-8, and over 21 compatible models. It replaces the original cell in compact Akai cameras that rely on this Ni-MH pack for photo and video capture. Voltage and capacity match OEM specifications exactly.
- BPN300 / BPN350 compatibility: These models share the same 6V voltage rail, connector housing, and BMS communication protocol. A single cell format covers the full range without adapter modifications or wiring changes.
- Bench tested on actual hardware: We cycled this battery through charge and discharge on camera-compatible test equipment. The BMS accepted the cell without flagging an incompatible battery warning, and voltage held stable across both still capture and short video bursts.
- First-use charge protocol for Ni-MH cells: Ni-MH chemistry benefits from a full charge cycle completed inside the camera body or OEM charger before heavy use. This allows the camera's battery gauge to map the discharge curve of the new cell accurately — skipping this step often causes the indicator to read erratically from the first session.
Camera showing dead battery indicator on a partially charged replacement cell
Akai's battery indicator maps voltage thresholds to percentage levels calibrated against the original cell's discharge curve. A new Ni-MH cell has a flatter voltage curve early in its life, which can read as critically low even when capacity remains. The camera's gauge has no reference data for the new cell until it completes at least one full charge cycle from empty to full. Run one full cycle before trusting the indicator display.
Flash not fully recycling between shots on a new battery
Flash recycling pulls a high burst of current to recharge the capacitor after each shot. If the cell is cold, below roughly 10°C, internal resistance in Ni-MH chemistry rises sharply and the available current drops. This causes the flash to take noticeably longer between shots or to fire at reduced power. Warm the camera to room temperature and ensure the battery has completed at least one full charge cycle — both steps reduce internal resistance and restore normal capacitor recharge current.
Compatible Models
Technical Specifications
Product Highlights
- Brand: Akai
- Manufacturer: CS
- Series: Standard
- Color: Black
- Product Type: Ni-MH
- Battery Type: Ni-MH
- Warranty: 12 Months
- Bulk Orders: sales@batteryweb.com
Frequently Asked Questions
My Akai BPN300 shows "no battery" even though the replacement cell is fully charged — why?
Camera bodies with BMS authentication checks sometimes reject a new cell on the first install because there's no charge history on record for it. Power the camera off completely, remove the battery, reinsert it, and place it in the OEM charger or charge it fully via the camera body once. That single charge cycle is usually enough for the BMS to accept the cell and clear the error.
The battery percentage on my BPN300 jumps around — shows 80%, drops to 20%, then climbs again mid-shoot.
Ni-MH cells have a flat discharge curve, and the camera's voltage-to-percentage mapping was calibrated to the original cell's specific curve. A new or different-brand cell discharges at slightly different voltage steps, so the indicator loses track and jumps between thresholds. Complete two full charge and discharge cycles inside the camera body — this gives the BMS enough data to remap the thresholds to the new cell's curve and stabilise the display.
Shot count is noticeably lower than expected even though the battery reads full — what's drawing the extra current?
Flash recycling, continuous autofocus, and video recording each add significant draw on top of the base sensor and processor load — the rated capacity assumes a controlled test cycle, not a real mixed-use session. Cold temperatures also reduce Ni-MH output current, compressing usable capacity before the voltage drops to the camera's cutoff threshold. Check whether flash is firing on every frame and whether continuous AF is active — disabling either one reduces per-shot current draw measurably. Keep the camera above 15°C for the most consistent output from a Ni-MH cell.
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