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The OnePlus 9 5G is a mid-range smartphone, released in March, 2021. It's the successor of the OnePlus 8 and features a 6.55" 120 Hz Fluid AMOLED and runs on a Qualcomm SM8350 Snapdragon 888 5G chipset.

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Why is the replacement battery only 2250mah on ifixit?

The 1+ 9 has a 4500mah battery capacity, but the replacement battery on here is only 2250mah. Is that the most I can get?

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What's the model number of yours? There's a caveat on the battery page stating that it doesn't fit the model LE2113 for the global market or model LE2117 for T-Mobile in the US.

Also, if you've opened your phone up yet, can you get the model number of the battery itself? The one iFixit sells is model number BLP829.

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It depends if these two cells are used in series or in parallel.

If they are used in parallel, we can consider both cells are a battery pack of two cells that have a total capacity of 2250*2 = 4500 mAh for a nominal voltage of 3,87 V.

But it seems the cells of the battery pack of this device are used in series as on the battery pack, we can read the nominal voltage is 7,74V (so it's 2 *3,87= 7,74V, 2 cells each 3,87 V nominal voltage).

If the cells of the battery pack are used in series, it has a total capacity of 2250 mAh for a nominal voltage of 7,74 V.

I think this unusual (2 cells) battery design (for a phone) choosed by the manufacturer is a clever trick to increase the charging rate by leverage the charging voltage.

Exemple :

- The phone might use the battery cells in parralel (so the capacity is doubled), and this keep the ability to charge the device using 5V USB port.

- but the phone might also charge them in series so the fast charger of the device double the charging voltage that makes the charging intensity remain the same and as the charging voltage is doubled, this double the amount of energy that is sent to the battery per unit of time.

But this is only an assumption.

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@dadibrokeit Yea i have LE2115. It will fill but I don't know if its gonna be the full 4500mah or just 2250mah.

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@es_six Alright, so it seems that it most likely is running in series. Then this battery is way too small for my needs. Thanks for you help!

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@kiraa Important : you should not consider only the battery pack capacity per cell (in mAh) to estimate if a battery is sufficient for your needs.

Indeed, the real amount of energy this battery pack can store is calculated in Wh (this is called Typical Capacity) because it's the product of the battery pack capacity times the nominal voltage.

Exemple :

The nominal voltage is 7,74V and the capacity is 2250 mAh (so it's 2,25Ah).

We compute the Typical Capacity of the battery using the equation for electrical power that is P=IV.

So this give :

- 7,74V * 2,25Ah = 17,415 Wh (in series)

- 3,87V * 4,5Ah = 17,415 Wh (in parallel)

As you can notice, this is the real amount of energy this battery pack can store, no matter the battery cells are in parallel or in series.

Also, this calculated Typical Capacity is written on the iFixit battery pack (value is truncated to 17,41Wh).

So if we compare the battery capacity of your phone (originally stated as 4500 mAh, it's the total of the 2 cells of the battery pack, so it's exactly the same Typical Capacity than the iFixit battery.

If on your battery pack, you can read it has a capacity of 4500mah, it's just the manufacturer of the original battery pack that express the capacity of the battery pack as the sum of all cells capacity in mAh instead of the capacity per cell.

Conclusion, the iFixit battery pack can store the exact same amount of energy than the original battery of your device.

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@kiraa The OnePlus 9 uses dual 2,250 mAh cells which equals a total capacity of 4,500 mAh. Looks like iFixit only has the specs listed on that one cell but looking at the size of the battery, it sure looks like there are two cells;-) I suggest you contact support@ifixit.com and see if they can assist you with that.

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Can anyone can confirm that. Check this out, I looked everywhere and not a single legitimate source has 4500 battery, everyone is listing it as 2200 battery not even 2250 if it's a half or one cell.

Thanks.

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@konstantin40588 it's been verified but contact contact support@ifixit.com so you can rest assured, that it is so.

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