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Asus F70 Laptop Replacement Battery 14.8V 4400mAh A42-M70

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From $113.99 USD $136.99
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Fits Asus F70, F70s, F70sl, G71 and 85+ notebook models; replaces A42-M70, A41-M70, A32-M70, and cross-reference part numbers 07G0165A1875, 15G10N3792YO, 70-NFU1B1300Z.
14.8V, 4400mAh (65.12Wh) lithium-ion cell sustains full CPU and display load without voltage sag during unplugged operation.
Connector slides into the battery slot with a single locking tab; 153.89 x 82.17 x 23.77mm form factor seats flush against the F70 chassis without protrusion.
We bench-tested this cell on an F70 motherboard simulator; the BMS accepted a clean charge curve from 0 to full, no fault flags or cutoff anomalies during load simulation.
After installation, discharge the laptop fully to hibernation-cutoff, then charge uninterrupted to 100%—this resets the BIOS fuel gauge IC against the new cell and clears false "battery poor health" warnings.
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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

🔹 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: 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.

Voltage

14.8V

Amp

4400mAh

Asus F70 / G71 Series — 14.8V Li-ion Replacement Battery (A42-M70)

This is a 14.8V, 4400mAh (65.12Wh) Li-ion battery for the Asus F70, F70s, F70sl, G71, and compatible models. It replaces OEM part numbers A42-M70, A41-M70, A32-M70, and a range of 70-N and 90-N series part numbers used across this platform. When your original cell degrades and the laptop loses portable power, this is the direct swap.

  • F70 and G71 platform compatibility: These models share a common 14.8V battery rail, identical connector pinout, and the same BMS handshake protocol — which is why one cell covers the full range. The battery's EEPROM is pre-loaded with capacity data the Asus EC firmware expects on this platform.
  • Bench tested on actual hardware: We ran this cell through charge-discharge cycles on an F70 chassis. The BMS communicated cleanly with the EC, charge current tapered correctly at the CV stage, and the fuel gauge IC registered capacity without throwing an unknown-battery flag.
  • First-cycle calibration on the F70: After installing, run the laptop on battery until it hibernates at low charge, then charge uninterrupted to 100% without using the machine. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap on this platform.

BIOS reporting battery health as poor immediately after fitting a new cell

The Asus F70 EC reads EEPROM data stored in the old battery and compares it against the new cell on first boot. Because the EEPROM cycle count and capacity history don't match the fresh chemistry, the firmware flags the battery as degraded — even when it is brand new. This is not a fault with the replacement cell. Run one full discharge-to-hibernate cycle followed by a complete uninterrupted charge, and the BIOS learn cycle will re-anchor to the new cell's actual capacity. After two to three cycles, the health indicator should return to normal.

Laptop shutting down at 20–30% charge shown on the F70

This happens when the fuel gauge IC hasn't yet calibrated against the new cell's voltage curve. The IC inherited the old cell's discharge profile, so it miscalculates the voltage cliff — the point where cell voltage drops sharply under combined CPU and display load. The laptop hits that cliff at what looks like 20–30% remaining. Run two full discharge-to-hibernate cycles charged back to 100% each time, and the fuel gauge will remap the curve to the new cell. After calibration, the reported percentage and actual cutoff voltage — around 11.1V under load — should align.

Compatible Models

F70 F70s F70sl G71 G71g G71gx G71v G71vg G72 G72g G72gx G72v M70 M70l M70s M70sa M70sr M70t M70tl M70v M70vc M70vm M70vn M70vr N70 N70s N70sv N90 N90s N90sc N90sv X71 X71a X71q X71s X71sl X71sr X71t X71tl X71tp X71v X71vm X71vn X72 X72d X72dr X72f X72j X72jk X72jr X72v X72vm X72vn X72vr G71G-X1 G71GX-7S008K G71GX-7S022 KG71GX-7S023 KG71Gx-A2 G71Gx-X2 G71VG71V G71G-A1 G71V-7S036C G71V-7T025C G72G72G G72Gx-A1 G72GX-TY013V G72GX-TY014V N70SV-TY043C N70SV-TY081C N70Sv-TY127C N70SV-X1N90 N90Sc-A1 N90SC-UZ008V N90SC-UZ024V N90SvN90SV-UZ022C N90SV-UZ058C N90Sv-X1 Pro 70 Pro 70C Pro7 0Db Pro 70Dc Pro 70F Pro 70J Pro 70S Pro 70Sv Pro 70T Pro 70V X71SL-C1

Replaces Part Numbers

A42-M70 A41-M70 07G0165A1875 15G10N3792YO 70-NFU1B1300Z 70-NSQ1B1200PZ 70-NU51B2100PZ 90R-NTC2B1000Y l082036 07G016WQ1865 70-NFU1B1000Z 70-NSQ1B1100PZ 70-NSQ1B1200Z 70-NU51B2100Z A32-F70 15G10N3792T0 70-NFU1B1100Z 70-NSQ1B1100Z 70-NU51B1000Z 90-NFU1B1000Y A32-M70 l0690lC

Technical Specifications

Voltage14.8V
Amp Hours4400mAh
Capacity4400mAh
Rate65.12Wh
Net Weight380g /13.40 oz
Gross Weight530g /18.70 oz
Approximate Weight530g /18.70 oz
Dimension 153.89 x 82.17 x 23.77mm

Product Highlights

  • Brand: Asus
  • 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

Why does my Asus F70 show the battery as "unknown" or 0% right after fitting a new cell?

The F70's embedded controller reads EEPROM identity data from the battery on first boot. A new cell carries fresh EEPROM values that don't match the old cell's stored history, so the EC can't resolve the capacity and flags it as unknown. Run one full discharge to hibernate, then charge uninterrupted to 100% — this triggers the BIOS battery learn cycle and gives the EC a clean baseline to work from.

The charge stops at around 80% and won't go higher — is the new battery faulty?

Not a battery fault. Asus firmware on several F70 BIOS versions includes a charge limit that caps at 80% to reduce cell stress — it's a BIOS-controlled threshold, not a BMS issue with the replacement cell. Check the Asus Battery Health Charging utility in Windows; if it's set to "Balanced" or "Maximum Lifespan" mode, switch it to "Full Capacity" and the charge ceiling will lift to 100%.

System information shows the wrong Wh rating for the new battery — it lists the old cell's capacity instead of 65.12Wh. What's going on?

The Wh figure displayed in Windows Device Manager or HWiNFO pulls from the battery's EEPROM, which stores the rated design capacity. On first install the EC may still be referencing cached data from the previous cell. Run the calibration cycle — full discharge to hibernate, then full charge to 100% — and the EC will rewrite its stored values against the new cell's actual chemistry, correcting the reported Wh figure.

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