3 votes

Are measurements of battery voltage enough to test its state of health?

I've spent a career building a few instances of battery-powered equipment, with a lot of planned projects that didn't come to fruition. This means that I've scrutinized a lot of methods, done a lot ...
TimWescott's user avatar
  • 45.8k
2 votes

Laptop battery "extension" / external connect?

can a laptop lithium-ion battery be connected external through some sort of "extension cord type" Yes, if you have a pair of corresponding mating connectors (one from a dead battery, and ...
Ale..chenski's user avatar
2 votes

Are measurements of battery voltage enough to test its state of health?

Yes, you're right – from the open-circuit voltage, you cannot infer the internal resistance, nor the remaining battery capacity. The power that the battery can supply must be measured. I'd say the ...
Marcus Müller's user avatar
1 vote

Charging of 14500 Batteries/ Low mAh reading

Both numbers may be correct. They are just measured under different conditions. If you don't know how exactly your device measures the capacity, and you don't know how exactly the manufacturer has ...
Justme's user avatar
  • 143k
1 vote

What Li-po batteries should I use to run a 32 kW BLDC motor for 10 minutes?

Definitely not a DIY battery. Since our company does some peak sheaving & load shifting projects, we do use battery banks so called super capacitor. These are packs of around 50V, rack mount, they ...
Marko Buršič's user avatar
1 vote

Is it feasible to make a DIY battery eliminator for my Godox camera flash?

The Godox uses Li-ion batteries so the voltage will initially be a bit more than 12V (3 cells at about 4.1V or 4.2V each) and will be more like 11.1 during the bulk of the discharge (at room ...
Spehro Pefhany's user avatar
1 vote

Is it feasible to make a DIY battery eliminator for my Godox camera flash?

1) Current Let's make a quick back of the envelope calculation about the Flash Battery: According to the manufacturer, the battery lasts for 650 full power flashes. 22 Wh = 22W*3600s = 79200 Joules /...
bobflux's user avatar
  • 74.8k
1 vote
Accepted

Using two "tool batteries" in parallel - Need a BMS?

The risk of doing this is pairing two unbalanced batteries together in parallel. Consider this, if one nominal 18V battery is fully charged it would now be ~21V (lets call this Battery A), if the ...
Explorex's user avatar
  • 388
1 vote

When wiring batteries in both series and parallel to increase the V and Ah, is there a difference between series-parallel and parallel-series?

Nomenclature. Your top example would be described as 2S2P first two cells in series and then this arranged as two parallel strings. The lower example would be 2P2S first two cells in parallel and then ...
RoyC's user avatar
  • 8,875
1 vote

Is this modified or pure sine wave...or something else?

It looks like just L output filter where 5ms is positive supplying cycle, 5ms just discharging L through freewheeling diode, 5ms negative supplying and another 5ms discharge L via freewheeling diode. ...
Michal Podmanický's user avatar

Only top scored, non community-wiki answers of a minimum length are eligible