Roller Multi-Press Mini ACC 12V 2000mAh Replacement Battery
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Roller Multi-Press Mini ACC 12V 2000mAh Replacement Battery - 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
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🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.
Roller Multi-Press Mini ACC 12V 2000mAh Replacement Battery - is backordered and will ship as soon as it is back in stock.
Voltage
12V
Amp
2000mAh
Roller Multi-Press Mini ACC — 12V Ni-MH Replacement Battery (571510)
This is a 12V, 2000mAh Ni-MH replacement battery for the Roller Multi-Press Mini ACC and Multi-Press Typ 571 press tools. It replaces OEM part numbers 571510 and 571513. The pack slots directly into the tool's battery bay and connects to the same charging circuit the original cells used.
- Multi-Press Mini ACC and Typ 571 compatibility: Both models share a 12V Ni-MH battery bay with the same connector pinout and charge-termination logic. The tool's charger uses delta-V detection to end the charge cycle — this pack responds correctly to that signal without modification.
- Bench tested on actual hardware: We cycled this pack through repeated press cycles on a Multi-Press Mini ACC and monitored the BMS response during inrush on the hydraulic motor start. The overcurrent threshold held without nuisance trips across all test cycles.
- Ni-MH cycle conditioning for press tools: Run the first two press cycles at light load before using the tool at full crimp force. This lets the cells settle their internal resistance baseline so the charge termination circuit reads accurate delta-V on subsequent charges.
BMS cutoff on hydraulic motor inrush during press trigger pull
The Multi-Press Mini ACC uses a small hydraulic motor that draws a high inrush current the moment the trigger fires. On a discharged or cold pack, this spike can exceed the BMS overcurrent threshold and cut the tool dead mid-cycle. Ni-MH cells tolerate inrush better than Li-ion but still drop voltage sharply when cell temperature is below 10°C. If the tool cuts out on trigger pull, warm the battery to room temperature before the next attempt — the pack's internal resistance drops significantly above 15°C and the BMS trip threshold is no longer breached.
Press tool bogs under load after a full charge indicator
If the tool feels sluggish or slows noticeably during the crimp stroke despite a freshly charged pack, the cause is usually voltage sag from high contact resistance at the battery terminals. Oxidised or dirty rail contacts reduce the effective voltage reaching the motor under load even when the open-circuit voltage reads 12V or above. Clean both the tool's battery contacts and the pack terminals with a dry cloth or fine abrasive, then recheck. Under load, a healthy 12V Ni-MH pack should not sag below 10.8V during the crimp stroke.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: Roller
- 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 Roller Multi-Press Mini ACC cuts out the instant I pull the trigger — what's happening?
That's an overcurrent trip in the battery's protection circuit, triggered by the hydraulic motor's inrush current spike at the start of the press cycle. It's most common when the pack is cold — below 10°C, Ni-MH internal resistance rises sharply and the voltage dip on trigger pull crosses the BMS cutoff threshold. Bring the battery to room temperature (above 15°C) before use. If it still trips at room temperature, check that the battery rail contacts are clean and making firm contact with the tool.
The charger never signals a completed charge on the new pack — it just keeps running or blinks without going green. Why?
A Ni-MH charger using delta-V termination needs to see a small voltage drop at the top of the charge curve to declare the cycle complete. If the pack sat in storage for an extended period and the cells self-discharged deeply, the charger may not detect that delta-V signal correctly on the first cycle. Run a full discharge cycle in the tool first, then recharge — this resets the cell voltage uniformity and gives the charger a clean charge curve to read. If the pack came out of long-term storage below 9V open-circuit, run two full discharge-charge cycles before trusting the charge indicator.
After several months of light use, the Multi-Press Mini ACC noticeably loses pressing force before the charge indicator drops. What causes this?
Shallow cycling — repeatedly charging the pack after only light use without ever fully discharging it — causes Ni-MH cells to develop a reduced effective capacity over time, a well-documented characteristic of this chemistry. The tool loses crimp force because the pack's usable voltage window has effectively narrowed even though the charge gauge still reads partial. Run two or three full discharge-and-charge cycles: use the tool until it slows noticeably, then charge fully. This reconditioning process restores most of the lost capacity by forcing all cells through their full voltage range.
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