#VBAT
November 19, 2024 at 3:28 PM
Good: they finally have some sort of hype machine other than "the CEO was a Navy SEAL and really needs you to know that"

Bad: this is jumping the shark in a way a VBAT nearly severing someone's fingers wasn't
October 22, 2025 at 10:04 AM
Yeah, there's an rp2040 on the other end, but when it light sleeps the current draw is pretty low (though it still doenst work when awake). I actually wondered if capacitors on the vbat side were causing the problem, but they demonstrably discharge fully when the switch is held down for long enough.
December 16, 2024 at 4:24 AM
I wanted to put a CR2032 coin cell battery holder, but after checking clearances it was not possible, and I didn't want to have wires and a battery hanging around. I realized I could fit a CR1220 battery holder on the side, so I did that. Battery measures 3.244V and RCLR# 3.228V, so lgtm.
July 24, 2024 at 12:45 PM
I put the part on a rubber mat so it doesn't slip, marked two desired drill locations with a marker, then made two small holes with an awl and a hammer, and drilled carefully. With the help of a cutter and the awl, I managed to make the hole bigger, disconnect and liberate the (supposed) VBAT pin.
July 24, 2024 at 11:36 AM
It's a bit hard to see, but after shining a light at the right angle it looks like the VBAT pin exists, just bent inwards and not available externally. From the datasheet I gather that the RAM Clear pin is internally pulled up, so it could be used to measure the internal battery voltage. 0V on mine.
July 24, 2024 at 10:43 AM
I found the datasheet for this VT82887, and also another one for VT82885. Comparing them, I suspect the VT82887 I have is just a VT82885 with internal crystal oscillator and battery encapsulated. If that's the case, then I have the location for what should be the VBAT pin.
July 24, 2024 at 10:29 AM
January 23, 2026 at 2:05 PM
-VBAT is only 1.276V. This is the voltage for the CMOS battery. For comparison, mine is 3.168 - 3.3V.

The two major things I've noticed that would impact stability/cause any issues would be the chipset temps and VBAT voltage.
March 3, 2025 at 6:06 PM
so this is the cursed setup that i've been using for this development. the tablet has a shattered screen and no battery. there is a blue pill connected to the UART and… its 5V pin to VBAT. to fool the bootloader a bit and to hopefully let it pull […]

[Original post on social.treehouse.systems]
November 25, 2024 at 6:06 PM
Not sure why gif ain't gif'n
November 25, 2024 at 2:03 AM
自動姿勢制御ができるなら
マルチプロペラ型になるがVBATと同様のドローンって作りやすいと思う

海自の新艦艇に搭載する「異形の機体」初号機が納入! お尻から垂直に離着陸 まるで空飛ぶ十字架!?(乗りものニュース)
#Yahooニュース
news.yahoo.co.jp/articles/b10...
海自の新艦艇に搭載する「異形の機体」初号機が納入! お尻から垂直に離着陸 まるで空飛ぶ十字架!?(乗りものニュース) - Yahoo!ニュース
海上自衛隊は2025年12月9日、無人航空機「VBAT」の初号機が横須賀造修補給所に納品されたと発表しました。 「VBAT」は、アメリカの防衛企業シールドAI社が開発した無人航空機です。海上自衛
news.yahoo.co.jp
December 13, 2025 at 12:28 AM
VBAT vs Poseidon H12: Γιατί η σύγκριση των δύο drones χάνει την ουσία

Η αγορά των VBAT από τον Στρατό προκάλεσε συζητήσεις για το κυπριακό Poseidon. Όμως, η επιλογή δεν κρίθηκε στα χαρτιά, αλλά στην αποδεδειγμένη δράση στο Αιγαίο, τη ναυτική ικανότητα και το μέλλον της τεχνητής νοημοσύνης στις…
VBAT vs Poseidon H12: Γιατί η σύγκριση των δύο drones χάνει την ουσία
Η αγορά των VBAT από τον Στρατό προκάλεσε συζητήσεις για το κυπριακό Poseidon. Όμως, η επιλογή δεν κρίθηκε στα χαρτιά, αλλά στην αποδεδειγμένη δράση στο Αιγαίο, τη ναυτική ικανότητα και το μέλλον της τεχνητής νοημοσύνης στις ένοπλες δυνάμεις.
r4nkx.wordpress.com
June 13, 2026 at 2:13 PM
정성호 장관이 국회로 돌아오려는 이유‼️

youtube.com/shorts/-vbat...
July 31, 2026 at 3:25 PM
Looks like pretty similar, this is the nrf52840, I'd have to check if you could get away with vbat mode or just standby on the stm32g0 side.
January 18, 2025 at 2:31 PM
Uh.
Well here's the circuit board, nothing too interesting except for a hidden reset button. Looks like a couple test points, vdd, vbat and gnd..

Vbat is at 3 volts! Not bad for 2008!

It seems it internally was known as SR-34, and the display board works with a whole bunch of models I think?
June 5, 2025 at 7:38 AM
So... turns out the reason I was having such a hard time getting the VBAT info to work was because the battery cell I was trying to use was very much dead. To be fair, I was recycling an older Samsung cellphone battery, but I think it's better for me to just send it for proper recycling.

Oh well.
July 26, 2025 at 11:16 PM