eMachines E-Slate 400K Replacement Battery 12V DR36
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eMachines E-Slate 400K Replacement Battery 12V DR36 - 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.
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Delivery and Shipping
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Disclaimer
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eMachines E-Slate 400K Replacement Battery 12V DR36 - is backordered and will ship as soon as it is back in stock.
Voltage
12V
Amp
3800mAh
eMachines E-Slate 400K / 450K — 12V Ni-MH Replacement Battery (DR36)
This is a 12V, 3800mAh (45.6Wh) Ni-MH replacement battery for the eMachines E-Slate 400K and E-Slate 450K tablets. It slots in when the original cell no longer holds a usable charge or fails to power the device away from a wall outlet. OEM part numbers DR36 and DR36S both cross-reference to this cell.
- E-Slate 400K and 450K compatibility: Both models run the same 12V battery bay, same connector pinout, and the same BMS handshake sequence. One cell covers both. No adapter or modification needed.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the E-Slate platform. The BMS accepted the cell without fault codes, and the charge controller reached termination voltage cleanly on the first cycle.
- First-cycle conditioning for Ni-MH: Run a full discharge to the device's auto-hibernate cutoff, then charge uninterrupted to 100% before normal use. Ni-MH cells do not activate full capacity until the first complete cycle — skipping this leaves measurable capacity on the table from day one.
BIOS reporting poor battery health immediately after fitting a new cell
The BIOS stores charge history and health data from the previous cell in its battery learn table. When a new cell goes in, that old data makes the new battery look degraded before it has run a single cycle. This is an EEPROM data mismatch — not a fault with the replacement cell. Run one full discharge to hibernate-cutoff followed by an uninterrupted charge to 100%. That cycle forces the BIOS to rewrite the learn table against the new cell's actual behaviour.
Fuel gauge jumping erratically for the first several charge cycles
The fuel gauge IC estimates state-of-charge by comparing measured voltage and current draw against a reference profile built on the old cell. A new Ni-MH cell has a different internal resistance curve, so early readings are unreliable. The gauge recalibrates gradually across three to five full charge and discharge cycles. After that, the percentage readout stabilises — keep cycling fully until it does. Do not judge cell capacity from the first two cycles.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: eMachines
- 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
The E-Slate shows 0% and won't charge at all after I fitted the new battery — is it dead already?
A 0% reading with no charge activity almost always means the BIOS battery learn table still holds data from the old, depleted cell. The firmware treats the new cell as an extension of the failed one and refuses to initiate a charge cycle. Connect the AC adapter, hold the power button for 15 seconds to clear any residual charge in the board, then reconnect power and let it charge uninterrupted. If the charge indicator comes on and the BIOS reads above 0% after 10 minutes, the cell is fine — the learn table just needed a reset trigger.
My E-Slate is shutting down suddenly at around 25% battery shown — what's causing that?
This is a voltage cliff specific to Ni-MH cells under combined CPU and display load. The cell voltage drops sharply once charge falls below roughly 30%, and the BMS trips the cutoff before the OS fuel gauge can catch up — so the screen shows 25% at the moment of shutdown. The fuel gauge IC needs calibration cycles to map the new cell's actual voltage curve. Run three full discharges to hibernate-cutoff and full charges to 100% consecutively. After those cycles the gauge tracks the voltage cliff accurately and the early shutdowns stop.
After replacing the battery, system information shows the wrong Wh rating — it says something different from the 45.6Wh on the spec sheet. Is this the wrong cell?
The Wh figure displayed in system info is pulled from the EEPROM on the battery circuit board, not measured live from the cell. The stored value reflects the original cell's rated chemistry rather than the replacement cell's actual measured capacity. This is a data field mismatch — the cell itself is correct. Run a full discharge and recharge cycle so the fuel gauge IC logs a measured capacity value. After that cycle, the system-reported Wh figure will update to reflect the actual cell behaviour.
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