For 2024 data, I have plotted collision efficiency q vs. LA-AA. Note that q removes variation due to both bat speed and pitch speed (q=(EV-vbat)/(vpitch+vbat). It peaks close to LA-AA=0, just as I would expect. Note that I have reversed the horiz and vert axes from your plot.
May 31, 2025 at 10:00 PM
For 2024 data, I have plotted collision efficiency q vs. LA-AA. Note that q removes variation due to both bat speed and pitch speed (q=(EV-vbat)/(vpitch+vbat). It peaks close to LA-AA=0, just as I would expect. Note that I have reversed the horiz and vert axes from your plot.
Ukrainians posing with a US-supplied V-BAT drone.
Second picture give you a better idea of what the VBAT looks like.
Second picture give you a better idea of what the VBAT looks like.
January 12, 2025 at 9:49 PM
Ukrainians posing with a US-supplied V-BAT drone.
Second picture give you a better idea of what the VBAT looks like.
Second picture give you a better idea of what the VBAT looks like.
Additionally both sides not having any ground based IAMD, specifically short range antidrone capes, is something I need to think about, because as played VBAT and TUAS just kind of keep farting around indefinitely until the controlling unit is killed, which probably isn't entirely realistic
December 1, 2025 at 4:31 AM
Additionally both sides not having any ground based IAMD, specifically short range antidrone capes, is something I need to think about, because as played VBAT and TUAS just kind of keep farting around indefinitely until the controlling unit is killed, which probably isn't entirely realistic
Took some time and started to tinker with the epaper display. Still need to figure out graphics and translate the VBAT information, but this works for what I need for now.
#diy #esp32 #smarthome
#diy #esp32 #smarthome
July 25, 2025 at 5:07 PM
Took some time and started to tinker with the epaper display. Still need to figure out graphics and translate the VBAT information, but this works for what I need for now.
#diy #esp32 #smarthome
#diy #esp32 #smarthome
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October 23, 2024 at 7:17 AM
For the US side JCCs were again entirely attached ones due to the relative baseline weakness of its forces. Usual UGV, log, VBAT, quadcopter, and drone swarm, along with unmanned boats and UUVs for the naval forces
November 29, 2025 at 9:29 AM
For the US side JCCs were again entirely attached ones due to the relative baseline weakness of its forces. Usual UGV, log, VBAT, quadcopter, and drone swarm, along with unmanned boats and UUVs for the naval forces
Turn 1:
- Naval moves on both sides
- US uses VBAT to uncover a stack of PLANMC units and dumps a HIMARS strike into it; initial bad rolls but I forgot I had a quadcopter equipped inf unit within striking distance so recollection magic 1 Type 05 platoon destroyed and hits against the other+Type 15s
- Naval moves on both sides
- US uses VBAT to uncover a stack of PLANMC units and dumps a HIMARS strike into it; initial bad rolls but I forgot I had a quadcopter equipped inf unit within striking distance so recollection magic 1 Type 05 platoon destroyed and hits against the other+Type 15s
September 22, 2025 at 3:20 AM
Turn 1:
- Naval moves on both sides
- US uses VBAT to uncover a stack of PLANMC units and dumps a HIMARS strike into it; initial bad rolls but I forgot I had a quadcopter equipped inf unit within striking distance so recollection magic 1 Type 05 platoon destroyed and hits against the other+Type 15s
- Naval moves on both sides
- US uses VBAT to uncover a stack of PLANMC units and dumps a HIMARS strike into it; initial bad rolls but I forgot I had a quadcopter equipped inf unit within striking distance so recollection magic 1 Type 05 platoon destroyed and hits against the other+Type 15s
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
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.
More UI and sensor integration work finished. VBAT is still drunk, so I removed it but still log it for calibration later.
July 25, 2025 at 10:37 PM
More UI and sensor integration work finished. VBAT is still drunk, so I removed it but still log it for calibration later.
@covertshores.bsky.social - not great. VBat viable alternative?
January 31, 2026 at 1:04 PM
@covertshores.bsky.social - not great. VBat viable alternative?
ゲームギア四号機（VA0）、リキャップ後も液晶が一瞬ついて消えるため診断。
電源部5Vと34Vが来てない、VBATやVRES系統は電圧が低いかおかしい感じ。
導通やると多少なるので、ショートも発生しているかもしれない。
引き続き原因究明。
電源部5Vと34Vが来てない、VBATやVRES系統は電圧が低いかおかしい感じ。
導通やると多少なるので、ショートも発生しているかもしれない。
引き続き原因究明。
March 5, 2024 at 4:05 AM
ゲームギア四号機（VA0）、リキャップ後も液晶が一瞬ついて消えるため診断。
電源部5Vと34Vが来てない、VBATやVRES系統は電圧が低いかおかしい感じ。
導通やると多少なるので、ショートも発生しているかもしれない。
引き続き原因究明。
電源部5Vと34Vが来てない、VBATやVRES系統は電圧が低いかおかしい感じ。
導通やると多少なるので、ショートも発生しているかもしれない。
引き続き原因究明。
EEEEEK! THIS IS STARTING IN 25 MINS!!!!
www.youtube.com/watch?v=vBAT...
www.youtube.com/watch?v=vBAT...
January 24, 2025 at 7:05 PM
EEEEEK! THIS IS STARTING IN 25 MINS!!!!
www.youtube.com/watch?v=vBAT...
www.youtube.com/watch?v=vBAT...
That would make me a Vbat :3
June 15, 2025 at 9:31 PM
That would make me a Vbat :3
It tried and actually did pretty well (R9 is wrong).
August 28, 2025 at 9:52 PM
It tried and actually did pretty well (R9 is wrong).
-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.
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
-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.
The two major things I've noticed that would impact stability/cause any issues would be the chipset temps and VBAT voltage.
esse artigo aqui é incrivel medium.com/inside-vbat/...
A peek inside Brazilian vernacular typography
Fresh, imaginative and honest.
medium.com
December 11, 2025 at 4:22 PM
esse artigo aqui é incrivel medium.com/inside-vbat/...
Ja, ich hab mich auch schon gefragt ob der VBAT-Eingang überhaupt so geschützt sein kann, da man den uC durchaus auch mit weniger als 3,3 V betreiben kann und die dann quasi immer leiten würde.
Wenn VBAT aber ungeschützt ist und höher sein darf als VCC, dann gibt es auch kein Problem.
Wenn VBAT aber ungeschützt ist und höher sein darf als VCC, dann gibt es auch kein Problem.
June 8, 2026 at 7:49 AM
Ja, ich hab mich auch schon gefragt ob der VBAT-Eingang überhaupt so geschützt sein kann, da man den uC durchaus auch mit weniger als 3,3 V betreiben kann und die dann quasi immer leiten würde.
Wenn VBAT aber ungeschützt ist und höher sein darf als VCC, dann gibt es auch kein Problem.
Wenn VBAT aber ungeschützt ist und höher sein darf als VCC, dann gibt es auch kein Problem.
the max possible EV is determined by the speed of the bat and the pitch via the formula:
vmax = vbat×(1+q) + vball×q
where,
• the velocities are measured immediately prior to impact
• vbat is the velocity of the head of the bat
• q is the “collision efficiency”
vmax = vbat×(1+q) + vball×q
where,
• the velocities are measured immediately prior to impact
• vbat is the velocity of the head of the bat
• q is the “collision efficiency”
January 16, 2025 at 9:51 PM
the max possible EV is determined by the speed of the bat and the pitch via the formula:
vmax = vbat×(1+q) + vball×q
where,
• the velocities are measured immediately prior to impact
• vbat is the velocity of the head of the bat
• q is the “collision efficiency”
vmax = vbat×(1+q) + vball×q
where,
• the velocities are measured immediately prior to impact
• vbat is the velocity of the head of the bat
• q is the “collision efficiency”
Interesting observation. My estimate based on lots of previous work I have done: An increase of bat speed by 1 mph increases HR probability (pHR) by 18%. In general, if I fit the data you show to the form pHR=A*exp(a*vbat), then I find a=0.165, which is very close to the 0.18 I estimated.
WE ALL KNOW BAT SPEED MATTERS BUT MY GOODNESS
Home Run Rate vs. Bat Speed (MPH)
Over half a million swings via Statcast
Home Run Rate vs. Bat Speed (MPH)
Over half a million swings via Statcast
May 8, 2025 at 8:22 PM
Interesting observation. My estimate based on lots of previous work I have done: An increase of bat speed by 1 mph increases HR probability (pHR) by 18%. In general, if I fit the data you show to the form pHR=A*exp(a*vbat), then I find a=0.165, which is very close to the 0.18 I estimated.
if the bat were rotating about the knob: the knob would be stationary, the head would be moving at vbat, and a point r inches from the head of the bat would be moving at vbat×(L-r)/L
Assuming a 33” bat, the sweet spot ~6” down would be moving at 81.8% the reported bat speed.
Assuming a 33” bat, the sweet spot ~6” down would be moving at 81.8% the reported bat speed.
January 16, 2025 at 9:51 PM
if the bat were rotating about the knob: the knob would be stationary, the head would be moving at vbat, and a point r inches from the head of the bat would be moving at vbat×(L-r)/L
Assuming a 33” bat, the sweet spot ~6” down would be moving at 81.8% the reported bat speed.
Assuming a 33” bat, the sweet spot ~6” down would be moving at 81.8% the reported bat speed.
🇺🇦🇧🇪🛩️ #Ukraine #Belgique #VBAT #Drone #DronesMilitaires #Défense #SoutienMilitaire #GuerreEnUkraine #ForcesOperations
forcesoperations.com/des-drones-v...
forcesoperations.com/des-drones-v...
Des drones V-BAT au décollage pour l'Ukraine grâce au soutien belge - FOB - Forces Operations Blog
Après les équipements NRBC, la protection et les armements individuels, le ministère de la Défense belge axe cette fois son aide militaire à l’Ukraine sur les drones. Un marché vient ainsi d’être attr...
forcesoperations.com
September 8, 2026 at 5:28 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
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.
Will do. It was the output from my charge circuit into the MOSFET which switches between VBAT and VUSB. Because I had rogue trace, there was massive noise along the entire power bus. This messed with the QSPI SO/SI.
TBH: I thought the LDO would have resolved it but it too was loaded with noise.
TBH: I thought the LDO would have resolved it but it too was loaded with noise.
November 18, 2024 at 9:00 PM
Will do. It was the output from my charge circuit into the MOSFET which switches between VBAT and VUSB. Because I had rogue trace, there was massive noise along the entire power bus. This messed with the QSPI SO/SI.
TBH: I thought the LDO would have resolved it but it too was loaded with noise.
TBH: I thought the LDO would have resolved it but it too was loaded with noise.
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
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.
Stimmt, das würde schon reichen. Hab mal wieder zu kompliziert gedacht. 🙈
Muss ja nicht exakt sein. Die typische VBAT-Spannung ist 3 V. 3,6 V ist genau die Grenze des erlaubten.
Muss ja nicht exakt sein. Die typische VBAT-Spannung ist 3 V. 3,6 V ist genau die Grenze des erlaubten.
June 8, 2026 at 7:35 AM
Stimmt, das würde schon reichen. Hab mal wieder zu kompliziert gedacht. 🙈
Muss ja nicht exakt sein. Die typische VBAT-Spannung ist 3 V. 3,6 V ist genau die Grenze des erlaubten.
Muss ja nicht exakt sein. Die typische VBAT-Spannung ist 3 V. 3,6 V ist genau die Grenze des erlaubten.