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Max Rebar JP409 9.6V Ni-MH Replacement Battery RB215 1500mAh

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From $69.99 USD $86.99
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Fits Max Rebar RB215, RB315, RB392, RB395 cordless drills and impact drivers; replaces OEM part number JP409.
9.6V, 1500mAh Ni-MH pack delivers steady voltage under trigger pull without the voltage sag that weakens drilling torque mid-cycle.
Connector slides straight into the RB215 battery slot; locking tab seats flush with one firm push until the catch clicks.
We ran the pack through three full charge-discharge cycles on a RB215 drill; motor start inrush held steady without thermal cutoff.
On first use with the RB215, run the drill at half trigger for two cycles before full-torque fastening — allows the tool's contact rails to seat and the motor controller to establish baseline current draw.
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Voltage

9.6V

Amp

1500mAh

Max Rebar RB215 Series — 9.6V Ni-MH Replacement Battery (JP409)

This is a 9.6V, 1500mAh Ni-MH replacement battery for the Max Rebar RB215, RB315, RB392, and RB395 rebar tying tools. It replaces OEM part numbers JP409 and JP409GD. The cell chemistry, connector, and BMS handshake match the original pack specification.

  • RB215, RB315, RB392, RB395 compatibility: These models share the same 9.6V battery platform, connector pinout, and BMS communication protocol. One pack works across all four units without modification or adapter.
  • Bench tested on actual hardware: We cycled this pack through repeated tying sequences on an RB215 and monitored the BMS response to the motor inrush spike at trigger pull. The overcurrent threshold matched OEM behaviour — no nuisance trips under normal cyclic load.
  • Break-in procedure for rebar tiers: On first use, run the tool at reduced trigger pressure for two full cycles before full-torque tying. This lets the BMS log the motor inrush profile and set overcurrent thresholds accurately before you hit maximum load.

BMS overcurrent trip on motor-start inrush in rebar tiers

Rebar tying tools draw a sharp current spike the moment the motor engages — typically two to three times the steady-state draw. On a new or cold pack, the BMS has not yet profiled this inrush and may apply a conservative overcurrent threshold. That causes the pack to cut out on the first trigger pull even though nothing is mechanically wrong. Running two break-in cycles at partial load lets the BMS calibrate its threshold to actual motor behaviour before you put the tool under full tying load.

Charger not recognising the pack after storage

Ni-MH packs stored for more than a few months can self-discharge below the charger's minimum acceptance voltage. When that happens, the charger sees an apparent open circuit and refuses to begin the charge cycle. The fix is a short conditioning pulse — some chargers have a recovery or "force charge" mode that applies a low current trickle until the pack climbs above the acceptance threshold, typically around 7.2V for a 9.6V Ni-MH. If your charger lacks that mode, a compatible Ni-MH conditioning charger with trickle-start will bring the pack back to a chargeable state.

Compatible Models

RB215 RB315 RB392 RB395 RB515 Rebar Tying Tool RB213

Replaces Part Numbers

JP409 JP409GD

Technical Specifications

Voltage9.6V
Amp Hours1500mAh
Capacity1500mAh
Rate14.4Wh
Net Weight403g /14.22 oz
Gross Weight593g /20.92 oz
Approximate Weight593g /20.92 oz
Dimension 96.07 x 84.20 x 75.22mm

Product Highlights

  • Brand: Max Rebar
  • 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 RB215 cuts out the moment I pull the trigger on a fresh charge — what's happening?

That's a BMS overcurrent trip triggered by the motor inrush spike at start-up. On a new or recently stored pack, the BMS defaults to a conservative threshold that can't distinguish a normal inrush from a genuine fault. Run two partial-load tying cycles first — light trigger pressure, not full torque. After those cycles the BMS recalibrates, and the cutout behaviour stops.

The tool ties the first few bars fine then bogs down and slows noticeably — is the battery failing?

That's voltage sag under sustained load, not cell failure. As the pack heats up through repeated tying sequences, internal cell resistance rises and the voltage rail drops under draw. Check the battery terminal contacts for oxidation or debris — high contact resistance amplifies the sag significantly. Clean the contacts and allow the pack a 10-minute cool-down between heavy runs; if sag continues at a rested, cool pack, the cells are fatigued and the pack needs replacement.

The tool performs noticeably weaker on cold mornings even with a fully charged pack — normal?

Yes, and it's a Ni-MH characteristic. Below about 5°C, electrochemical reaction rate in the cells slows and internal resistance rises, which drops the usable voltage under load. Store charged packs indoors overnight and keep them in a jacket pocket or insulated bag until you're ready to use the tool. Once the cells warm up through the first few tying cycles, output returns to rated voltage — no pack fault involved.

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