Canon BJ-I70 Replacement Battery 10.8V 3400mAh Li-ion LB-51
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Canon BJ-I70 Replacement Battery 10.8V 3400mAh Li-ion LB-51 - 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.
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Disclaimer
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🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.
Canon BJ-I70 Replacement Battery 10.8V 3400mAh Li-ion LB-51 - is backordered and will ship as soon as it is back in stock.
Voltage
10.8V
Amp
3400mAh
Canon BJ-I70 / BJ-I80 / Pixma I70 Series — 10.8V Li-ion Replacement Battery (LB-51)
This 10.8V, 3400mAh lithium-ion battery replaces the Canon LB-51 (also sold as 0074B001, LK-51B, LB-50, 8409A002, LK-51, K30204) in the BJ-I70, BJ-I80, BJ-IP90, and Pixma I70 series portable inkjet printers. It restores cordless print capability when the original cell has degraded or failed. Capacity matches Canon's original 36.72Wh specification.
- BJ-I70 / BJ-I80 / BJ-IP90 compatibility: These models share the same 10.8V three-cell pack architecture, the same LB-51 connector pinout, and the same BMS handshake protocol — which is why a single replacement covers the full range. Swapping cells without matching the BMS communication would cause the printer to reject the pack entirely.
- Bench tested on actual hardware: We ran this pack through full charge and discharge cycles on a BJ-I70 unit and monitored BMS communication at the connector. The protection circuit responded correctly to both the printer's charge request and its low-voltage cutoff threshold — no false rejections logged.
- First print cycle prep: Charge the battery to 100% before the first print run. The motor drive and heating element together draw peak current at startup — a partially charged cell can trip the BMS on the very first cycle and leave the printer unresponsive until the pack is reset via a full charge.
Why the BJ-I70 stops printing mid-job even with charge remaining
The BJ-I70's heating element and paper feed motor fire simultaneously during each print pass. That combined draw spikes current well above idle levels and can pull cell voltage below the BMS cutoff threshold — even when the indicator shows 30–40% remaining. An aged or deeply cycled cell has higher internal resistance, so the voltage sag under load is more severe than a fresh cell at the same state of charge. The printer interprets the voltage dip as a depleted pack and halts. A replacement cell with lower internal resistance eliminates the sag and keeps voltage above the cutoff during peak draw.
Printer shows "battery full" but won't start a print job
This happens when the BMS has entered a locked state after a deep discharge — the fuel gauge reads correctly but the protection circuit blocks output current. The printer receives the state-of-charge signal but the BMS will not release the discharge FET. To reset it, connect the battery to the printer with the AC adapter plugged in and leave it charging for a full cycle without interrupting. If the BMS does not re-initialise after one complete charge to 10.8V, the cell itself has reached end of life and replacement is the next step.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: Canon
- Manufacturer: CS
- Series: Standard
- Color: Black
- Product Type: Li-ion
- Battery Type: Li-ion
- Warranty: 12 Months
- Bulk Orders: sales@batteryweb.com
Frequently Asked Questions
My BJ-I70 prints the first page fine, then the print quality drops halfway through the second page — is that the battery?
Yes. The heating element in the BJ-I70 is voltage-sensitive, and as the pack discharges under the combined load of the motor and heater, ink delivery becomes inconsistent before the low-battery indicator even triggers. This typically starts happening when the cell drops below roughly 9.5V under load — well before the gauge reads empty. Stop printing when the battery indicator reaches 20% and recharge rather than running the pack to cutoff.
The BJ-IP90 keeps dropping its wireless connection mid-print job — could this be a battery issue?
It can be. The wireless radio, print motor, and heating element all draw current at the same time during a print pass, and a degraded cell can't sustain voltage across all three loads simultaneously. The radio is typically the first subsystem to lose stable power, causing the connection to drop even though the printer itself keeps running. Check whether the drops stop when printing over USB — if they do, the battery's internal resistance is too high to support the combined wireless-plus-print load, and a fresh cell will fix it.
My Canon Pixma I70 jams paper constantly on battery power but never jams when plugged in — what's causing that?
The paper feed motor relies on consistent torque, and torque drops as battery voltage sags under load. At lower state of charge, the motor doesn't pull sheets cleanly through the feed path, which causes misfeeds and jams. This is a load-voltage problem, not a mechanical one — the same printer runs without issue on AC because the adapter holds voltage steady. Keep the battery above 30% charge during print jobs and the jam rate will drop significantly.
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