None. These batteries have been known by various terms, originally SLA (sealed lead acid) and nowadays VRLA (valve regulated lead acid). They are all non spillable gel based and can be used and charged in any position.
YUASA Little Red Book of Batteries
Great.
BTW, talking here about Lead Acid batteries reminded me that there's an extremely low-cost option for getting such battery + charger.
Several years ago I saw a product in a store which was called "Emergency Flashlight",
one that you leave always connected to the wall, for charging,
and it starts working as soon as there's no power from the wall.
I did not need it, but since it was only 5$, and rechargeable, I was curious to buy and disassemble it.
And I did.
It had inside a nice Lead Acid battery, something like 5x5x4cm - a really cute box-shaped battery.
I do not remember the voltage (and cannot find it anymore), and it also contains a charging mechanism.
It cost back then 5$ here..
I now see it for less than 10$..
If the battery is 12v, it's terrific, and cheap as hell,
less than the power tools pack option..
BTW, talking here about Lead Acid batteries reminded me that there's an extremely low-cost option for getting such battery + charger.
Several years ago I saw a product in a store which was called "Emergency Flashlight",
one that you leave always connected to the wall, for charging,
and it starts working as soon as there's no power from the wall.
I did not need it, but since it was only 5$, and rechargeable, I was curious to buy and disassemble it.
And I did.
It had inside a nice Lead Acid battery, something like 5x5x4cm - a really cute box-shaped battery.
I do not remember the voltage (and cannot find it anymore), and it also contains a charging mechanism.
It cost back then 5$ here..
I now see it for less than 10$..
If the battery is 12v, it's terrific, and cheap as hell,
less than the power tools pack option..
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It actually uses LEDs.
High-Brightness LEDs.
Back then when I disassembled it, I asked some friends who are good in electronics why Lead Acid was chosen as the rechargeable battery in it, and not some other known type like Ni-MH or Li-Ion,
and they said that Lead Acid has an advantage of keeping its charge for long terms,
and is also more durable even when charged for long periods.
Lead Acid has a disadvantage also, which is long charging time..
But since this is not a smartphone, but an emergency flashlight, the long charging time disadvantage is not a problem.
I found several who use Lead Acid, several who use Li-Ion,
and half of the models did not specify the battery type..
So you buy and gamble, you don't know what you will get inside..
High-Brightness LEDs.
Back then when I disassembled it, I asked some friends who are good in electronics why Lead Acid was chosen as the rechargeable battery in it, and not some other known type like Ni-MH or Li-Ion,
and they said that Lead Acid has an advantage of keeping its charge for long terms,
and is also more durable even when charged for long periods.
Lead Acid has a disadvantage also, which is long charging time..
But since this is not a smartphone, but an emergency flashlight, the long charging time disadvantage is not a problem.
When I searched today online for such emergency flashlights,
I found several who use Lead Acid, several who use Li-Ion,
and half of the models did not specify the battery type..
So you buy and gamble, you don't know what you will get inside..
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