LateralNW
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Updated 14 Dec 2025 adding clarity to the chemistry used in the A810 battery.
I haven't seen any advertising material from 70mai stating the advantage of the battery chemistry
so I want to balance the hysteria found when Li-ion is mentioned. It's not as straightforward as I first thought.
After watching several videos and not finding any that explain how to replace the battery in the 70mai A810, I decided to create one.
The A810 can be challenging to disassemble due to its tightly fitted frame and the way the lens interferes with the assembly process.
In my video, I demonstrate how I managed to carefully separate the A810 and replace the battery.
I also provide guidance on reassembling the device, as putting it back together can be just as tricky.
For replacement batteries, suitable options can be found on AliExpress.
Look for the HMC1450 Li-ion LMO* Battery, 3.7V, 500mAh.
* Note while still considered a Li-ion battery the chemistry is a little different which has some up sides to standard Li-ion
*
"LMO (Lithium-Manganese Oxide, LiMn₂O₄) Li-ion chemistry has a few real, practical advantages — especially for devices like dash cams.
Key advantages of LMO vs other Li-ion chemistries
Much better thermal safety
LMO is more thermally stable than cobalt-rich chemistries (LCO).
Lower risk of thermal runaway.
This is very important in cars, where cabin temperatures can exceed 70 °C.
Much better thermal safety
NOTE: source material is usually behind a paywall or very complicated answers.
en.wikipedia.org
Additionally, I’ve reached out to 70mai to inquire if users can purchase replacement batteries directly from them, though I haven’t received a response yet (I only asked yesterday).
Dec 2025 I don't think you can purchase it from 70mai.
I hope this video helps anyone looking to replace the battery in their 70mai A810!
Hope this helps someone.
I haven't seen any advertising material from 70mai stating the advantage of the battery chemistry
so I want to balance the hysteria found when Li-ion is mentioned. It's not as straightforward as I first thought.
After watching several videos and not finding any that explain how to replace the battery in the 70mai A810, I decided to create one.
The A810 can be challenging to disassemble due to its tightly fitted frame and the way the lens interferes with the assembly process.
In my video, I demonstrate how I managed to carefully separate the A810 and replace the battery.
I also provide guidance on reassembling the device, as putting it back together can be just as tricky.
For replacement batteries, suitable options can be found on AliExpress.
Look for the HMC1450 Li-ion LMO* Battery, 3.7V, 500mAh.
* Note while still considered a Li-ion battery the chemistry is a little different which has some up sides to standard Li-ion
*
"LMO (Lithium-Manganese Oxide, LiMn₂O₄) Li-ion chemistry has a few real, practical advantages — especially for devices like dash cams.
Key advantages of LMO vs other Li-ion chemistries
Much better thermal safety
LMO is more thermally stable than cobalt-rich chemistries (LCO).
Lower risk of thermal runaway.
This is very important in cars, where cabin temperatures can exceed 70 °C.
Much better thermal safety
- LMO is more thermally stable than cobalt-rich chemistries (LCO).
- Lower risk of thermal runaway.
- This is very important in cars, where cabin temperatures can exceed 70 °C."
NOTE: source material is usually behind a paywall or very complicated answers.
Lithium ion manganese oxide battery - Wikipedia
Additionally, I’ve reached out to 70mai to inquire if users can purchase replacement batteries directly from them, though I haven’t received a response yet (I only asked yesterday).
Dec 2025 I don't think you can purchase it from 70mai.
I hope this video helps anyone looking to replace the battery in their 70mai A810!
Hope this helps someone.
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