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Black rectangular laptop battery with label showing 7.5V 31Wh

Dr. Battery

Dr. Battery C21N1333 7.5V 31Wh laptop battery

SKU CH-0W8S-SJP3Z

Replacement lithium-polymer battery for Asus Transformer Book Flip TP550 series, 7.5 V 31 Wh with short-circuit and overheat protection

  • ColorBlack
  • TypeBattery
  • CompatibilityCOMPATIBLE LAPTOP MODELS Asus Transformer Book Flip: TP550LA
  • Battery TypeLithium Polymer
  • Battery Voltage7.5V
  • Battery Capacity4100 mAh
  • Restores mobility with 31 Wh lithium-polymer capacity
  • Fits Asus Transformer Book Flip TP550LA TP550LD TP550LJ series
  • Replaces original Asus 0B200-00860200 C21N1333 batteries
  • Built-in short-circuit overheat and overload protection
  • New condition backed by one-year manufacturer warranty

Direct replacement for Asus Transformer Book Flip

This lithium-polymer battery matches the original 7.5V and 31Wh specifications for the TP550LA, TP550LD and TP550LJ series. It replaces Asus part numbers 0B200-00860200, C21N1333 and C21NI333. The unit is new and includes built-in short-circuit, overheat and overload protection.

Steady output during extended sessions

The 4100 mAh cell delivers consistent voltage across the discharge curve rather than peaking early and fading. Integrated safety circuits regulate current flow to prevent thermal spikes when the laptop draws continuous power for long periods. This helps maintain stable run times throughout the charge cycle.

Upgrades worn or failed original packs

Owners of the listed Transformer Book Flip models can restore full mobility when the factory battery no longer holds a charge. The swap is not worthwhile if the machine already achieves its rated endurance or if the charging circuit itself is faulty. Confirm the exact model and original battery number before ordering.

Highlights

  • Restores mobility with 31 Wh lithium-polymer capacity
  • Fits Asus Transformer Book Flip TP550LA TP550LD TP550LJ series
  • Replaces original Asus 0B200-00860200 C21N1333 batteries
  • Built-in short-circuit overheat and overload protection
  • New condition backed by one-year manufacturer warranty

Specifications

BrandDr. Battery
ModelDRPROAS271P-01
ColorBlack
TypeBattery
CompatibilityCOMPATIBLE LAPTOP MODELS
Asus Transformer Book Flip:
TP550LA | TP550LA-BH71T-CB | TP550LD | TP550LJ
COMPATIBLE ORIGINAL BATTERY NUMBERS
Asus:
0B200-00860200 | C21N1333 | C21NI333
REMARKS
• Please confirm your laptop model and battery number before placing an order
HOW TO FIND A COMPATIBLE BATTERY
1. Please hit the [Ctrl] + [F] button on your keyboard to find your laptop model and original battery number from the list above.
2. The battery number and voltage can be found on your original battery.
3. Please also confirm the voltage of your original battery before placing an order.
4. W
Battery TypeLithium Polymer
Battery Voltage7.5V
Battery Capacity4100 mAh

Questions about this item

Does the 7.5 V lithium-polymer pack run hot or draw extra power during all-day use?

The built-in short-circuit, overheat and overload protections keep the 7.5 V lithium-polymer pack operating within safe thermal and power limits during continuous use.

Must I already own a specific Asus Transformer Book Flip model for this C21N1333 replacement to fit?

Yes — it fits only the TP550LA, TP550LA-BH71T-CB, TP550LD or TP550LJ and replaces original Asus part numbers 0B200-00860200, C21N1333 or C21NI333.

Will the 4100 mAh capacity work reliably in an older TP550 series chassis that has seen years of charge cycles?

The new 31 Wh lithium-polymer cells restore the original runtime and the protection circuitry guards the aging platform against over-current and over-temperature events.

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