70mai Dash Cam Battery Pack

[Chuck McCoy]

It’s like an engine only firing on three cylinders instead of on all four.
It drives but we shouldn't drive like that to prevent complete engine damage.

Connecting cells first in series then in parallel or vice versa, react differently on damaged cell, depending on how the cell fails (short or open or somewhere in between), neither way is fully safe.
If you connect cells in series group first, then in case of the short for one of the cell in group, the remaining cells in group would be at lower combined voltage relative to other groups in parallel, which is really not good because higher voltage group at 4 x 3.6 =14.4V will charge damaged group which is limited to 3 x 3.6 =10.8V to equalize the voltage, this will over-voltage remaining cells and this is not safe with potential fire hazard.
Nevertheless, the BMS should detect the failed cell and provide warning and stop some operations like charging or better shut the battery down completely.

So to confirm my original statement;
“If any one cell fails, the entire pack will be inoperable because the BMS will detect the malfunction, and prevent charging”
It is NOT an issue of loosing capacity.
It’s all, or nothing.
Is this correct?

 

[kamkar]

woke up to a TXT from my dashcam today, the battery was low and it had shut down.
Mind you the 4G was still on, and i could also " call in " wake up the camera and get a live view.
So i spent a little money on the interweb, and a good hour later i got a MSG saying my stuff was ready for pickup, so i took a lengthy drive to recharge the battery, mind you the drive to the pickup point was just 50 minutes or so MAX, but upon arriving there i had a full line of LEDs on the power bank indicating a full charge.

Tomorrow i am once again going to the range to hone my accuracy with the rifle, and of course also do a little building on the new shed CUZ it aint fully winter ready yet.
Anyways once parked there i recon it will be upwards of 30 hours before my car will drive again, so i am going to see what this battery can do uninterrupted service.

 

[GPak]

So to confirm my original statement;
“If any one cell fails, the entire pack will be inoperable because the BMS will detect the malfunction, and prevent charging”
It is NOT an issue of loosing capacity.
It’s all, or nothing.
Is this correct?

Correct, for a fully or near fully faild cell.
Any 'selfrespecting' 🙂 BMS has a max allowed imballance setting between cells (any two cells), once that imbalance is reached 'selfrespecting' BMS should shut the battery dow.

It is an issue of losing capacity, only within that imbalance threshold when the cell slowly degrade, and it is not practically different for 4, 8 or 20 cells.

 

[Chuck McCoy]

woke up to a TXT from my dashcam today, the battery was low and it had shut down.

Would you be so kind to see if the battery pack can be charged by connecting a standard Type-C cable, and power brick?
Or better yet a Type-C Laptop Charger?

 

[kamkar]

Dont really have any powerful chargers here, CUZ not fan of fast charge. but yeah i do have a wall wart that can charge my phone and action camera.
I will see if i can remember this when i get back home

Dunno why you would do that though, i could not be bothered with taking the power pack in and out of the car.

 

[Chuck McCoy]

Dunno why you would do that though, i could not be bothered with taking the power pack in and out of the car.

This is one of the biggest concerns for consumers that do not drive long enough, or often enough to fully charge the pack.
Previously with EGEN packs consumers must purchase a separate / dedicated AC/DC home charger for $60 to fully charge the unit when they don’t drive long enough, or often enough.
The capability to charge the unit with a Type-C “laptop” charger they already own will be a huge convenience, and cost saving measure.

 

[kamkar]

Indeed, and i do drive very little myself, so say having come home Tuesday from visiting my mothers, the fully charged power pack would be out of juice some time late Wednesday or early Thursday, and Wednesday or Thursday i might just do a short run to the shop, and that's just a mile both ways included, so not much of a charge.
But then i might not drive before Saturday.

Anyway as i have CCTV on the parked car at home, i am not running up and down the stairs to my 2 floor apartment to charge the power bank, but people with a house and so the car right outside, well for them it might be a thing they would want to do.


BTW my friend have a mains power supply that have a 12 V socket like in a car, it is meant to power a electric cooler box at home, so you could use something like that to charge at home with a little pig tail wire with the correct plugs.

 

[kamkar]

NO it do not seem to charge VIA the USB C plug, at least no LED is flashing like Charging in the car is indicated.

 

[Chuck McCoy]

NO it do not seem to charge VIA the USB C plug, at least no LED is flashing like Charging in the car is indicated.

Thanks for checking.

 

[kamkar]

No sweat buddy.

 

[kamkar]

Okay a little sweat, seem like unplugging the hard wire 4G kit, mean i will have to pair it again.

 

[stephenjones]

I have been checking their website for a while now. No updates yet on the release.

 

[rcg530]

70mai has sent me a test/review sample of this dash camera battery pack. UPS shipping status suggests it will be delivered tomorrow, but based on the last scan being in Hong Kong, I doubt that I'll see it tomorrow.

 

[Chuck McCoy]

I have been checking their website for a while now. No updates yet on the release.

Last info update was 9/1/24;

70mai Battery Pack for Dash Cam: Ensure Continuous

Enhancing Automotive Technology Introduction to Automotive Technology Advances Automotive technology is advancing rapidly and revolutionizing how we use and interact with our vehicles.

70mai.store

UPS shipping status suggests it will be delivered tomorrow,

Mine is scheduled for tomorrow too.
I’ve never had UPS from China, or Korea before.
It’s usually FedEx, DHL, or 4PX.
This should be interesting.

I’m thinking about ordering some MR30 connectors for testing;
https://www.amazon.com/gp/B0CB6JTF9J
But I can only find 18AWG sizes.
I’m kind of disappointed they’re not using XT60 (12AWG) like the EGEN packs.

 

[kamkar]

I got stuff coming too, but it is just air rifle spare parts from the Netherlands, hope it arrive before i have to leave for my mothers place and after that my friends place CUZ he need a little help too.

 

[rcg530]

The UPS shipping status was correct. I just received the 70mai battery pack.

Specifications listed on the box:

• Model: BL96NNX
• Nominal Voltage: 12.8V
• Rated Capacity: 7500 mAh
• Rated Energy: 96 wh
• Nominal Capacity: 7600 mAh
• Limited Charging Voltage: 14.6V
• DC Output (XT30): 11.2 - 14.2V 2A Max
• Type-C Output: 5V 2.4A Max
• DC Input: 11.2-30V 11A Max
• Charging Temperature: 0°C ~ 45°C (32°F ~ 113°F)
• Discharge Temperature: -10°C ~ 60°C (14°F ~ 140°F)

Additional Specifications In User Manual:

• Battery Type: LiFePO4
• Storage Temperature: -10°C ~ 60°C (14°F ~ 140°F)
• Max Cigarette Lighter Power Adapter Charging Amps: 7 Amps
  • Charging Time: 90 minutes
  • The CLA charging cable is not included in the box (optional accessory)
• Max Fuse Box Charging Amps: 11 Amps
  • Charging Time: 60 minutes
• After 2000 complete charge/discharge cycles
  • Battery retains 70% of its original capacity

Battery Pack Size

• 22 CM x 12 CM x 3.5 CM (8.67" x 4.72" x 1.38")

What's In The Box

• Battery Pack
• Fuse box charging cable
• Parking surveillance cable adapter
  • 3-wire cable that is to be spliced with dash camera's hardwire cable/adapter/kit
  • Each wire also has a 1-wire lever connector nut [no soldering required]
• Type-C to Type-C output power cable
• Four fuse taps
• Four 20A fuses [one for each fuse tap type]
• Cable ties
  • The box I received only contained one Velcro cable tie
• Two Velcro tape strips
  • Can be used to secure the battery pack to the installation location
• User manual

 

[Chuck McCoy]

The UPS shipping status was correct. I just received the 70mai battery pack.

Specifications listed on the box:

• Model: BL96NNX
• Nominal Voltage: 12.8V
• Rated Capacity: 7500 mAh
• Rated Energy: 96 wh
• Nominal Capacity: 7600 mAh
• Limited Charging Voltage: 14.6V
• DC Output (XT30): 11.2 - 14.2V 2A Max
• Type-C Output: 5V 2.4A Max
• DC Input: 11.2-30V 11A Max
• Charging Temperature: 0°C ~ 45°C (32°F ~ 113°F)
• Discharge Temperature: -10°C ~ 60°C (14°F ~ 140°F)

Additional Specifications In User Manual:

• Battery Type: LiFePO4
• Storage Temperature: -10°C ~ 60°C (14°F ~ 140°F)
• Max Cigarette Lighter Power Adapter Charging Amps: 7 Amps
  • Charging Time: 90 minutes
  • The CLA charging cable is not included in the box (optional accessory)
• Max Fuse Box Charging Amps: 11 Amps
  • Charging Time: 60 minutes
• After 2000 complete charge/discharge cycles
  • Battery retains 70% of its original capacity

Battery Pack Size

• 22 CM x 12 CM x 3.5 CM (8.67" x 4.72" x 1.38")

What's In The Box

• Battery Pack
• Fuse box charging cable
• Parking surveillance cable adapter
  • 3-wire cable that is to be spliced with dash camera's hardwire cable/adapter/kit
  • Each wire also has a 1-wire lever connector nut [no soldering required]
• Type-C to Type-C output power cable
• Four fuse taps
• Four 20A fuses [one for each fuse tap type]
• Cable ties
  • The box I received only contained one Velcro cable tie
• Two Velcro tape strips
  • Can be used to secure the battery pack to the installation location
• User manual

Mine just showed up, and it's missing the Cigarette Lighter Charging cable.
Huge bummer.
I sent Floria an email asking to send one out.

 

[rcg530]

I performed the initial "fuse box" charge of the 70mai dash camera battery pack taking it straight from the product box. The status LEDs showed three green LEDs when I turned on the battery pack. During my initial charge cycle test from roughly a 75% charge level to a 100% charge level, the maximum amp draw observed was 8.9 amps. As the charge level neared 100%, the charging amp draw went from 8.9 amps to 6 mA over a five minute (or so) period of time.

While the battery pack was charging, the output voltage level [going to the dash camera] for the VCC (constant) power wire reached 14.22 volts and the ACC (accessory) power wire reached 14.07 volts. When the battery pack reaches a 100% charge level and the charging amp load drops to 6 mA [with ACC In still on], the output voltages dropped by just over 0.3 volts on each output power wire. If the ACC In power is turned off, the battery pack power draw drops to 2 mA.

 

[Chuck McCoy]

I performed the initial "fuse box" charge of the 70mai dash camera battery pack taking it straight from the product box. The status LEDs showed three green LEDs when I turned on the battery pack. During my initial charge cycle test from roughly a 75% charge level to a 100% charge level, the maximum amp draw observed was 8.9 amps. As the charge level neared 100%, the charging amp draw went from 8.9 amps to 6 mA over a five minute (or so) period of time.

While the battery pack was charging, the output voltage level [going to the dash camera] for the VCC (constant) power wire reached 14.22 volts and the ACC (accessory) power wire reached 14.07 volts. When the battery pack reaches a 100% charge level and the charging amp load drops to 6 mA [with ACC In still on], the output voltages dropped by just over 0.3 volts on each output power wire. If the ACC In power is turned off, the battery pack power draw drops to 2 mA.

Me too.
I observed everything you mentioned here, except the maximum Amperage was only 8.6 Amps.

 

[stephenjones]

I see it up for order on their website now.