Lead Battery Voltage Question

[Butterfly]

I have a device with a small LEAD battery used as backup, it's 6V 1.2AH and I am trying to find a replacement. The label mentions 0.36VA

If I use a 6V 4.5AH, would that work ? or could it damaged the circuitry ? the labels mention 1.2VA on the replacement.

another question, does it matter if the device runs on 110V or 220V for the LEAD battery to recharge ?

[Mid]

If I use a 6V 4.5AH, would that work

yes , 6V is 6V , Ah refers to capacity so a 4.5 Ah will last longer than a 1.2 Ah before it needs recharging .

does it matter if the device runs on 110V or 220V

yes , 110v must go on 110v only and 220 on 220 .

[Butterfly]

yes , 110v must go on 110v only and 220 on 220 .

that wasn't the question Mid, for the battery to recharge, does it matter if the device run on 110 or 220 ? basically, is there LEAD battery for 220 or 110 knowing that VA would be different on 110

[lom]

If I use a 6V 4.5AH would that work ? or could it damaged the circuitry ?

It wont damage the consuming circuitry but may damage the charging circuitry, it will pull more current from the charger which may not be able to cope with that.

[Butterfly]

^ ok, but the charger is in 110V, so 1.2VA under 220 would be what under 110 ?

2.4VA ? so that would actually double the damage ?

[the dogcatcher]

Don't feed 220 into something designrd for 110.
If there is an option on the equipment ie you can switch between voltages then it wont affect the backup battery.
It's the charging part of the question that poses the problem.
The battery has really got to be exactly right.

[Butterfly]

Don't feed 220 into something designrd for 110.

of course, there is a transformer in between 110/220

[Butterfly]

so the output is 110V fed into a 6V transformer for a LEAD battery at 1.2AH with 0.36VA

[slackula]

^ ok, but the charger is in 110V, so 1.2VA under 220 would be what under 110 ? 2.4VA ? so that would actually double the damage ?

It'll be the square root of a third of that (Ohm's law) so you (and your vibrator charger) will be fine. Knock yourself out!

[Butterfly]

It'll be the square root of a third of that (Ohm's law) so you (and your vibrator charger) will be fine

ok slower please, can you demonstrate that ? no, not the vibrator

[Scaramanga]

Led Batteries are simple. Provided the battery is 6V sealed lead-acid type then you can buy a trickle charger that will cope easily with 5Ah. The stronger AH will not affect the device.

If the original charger is 110V then discard it unless you have a transformer 220-110.

The input power to the charger will not affect the output charge. So you can use a 220volt unit to charge the battery provided the output is just over 6volts at about 300mA

[Butterfly]

ok I am lost,

replacement Lead battery here are 6V 4.5Ah, and it says 1.2A (1200 mA)

Original Lead battery is 6V 1.2Ah and it says 0.36A (360 mA)

Can I use the replacement ? Lom is saying that the "recharcher" in the unit will probably fail eventually because of the stronger Ah or mA, not sure which. Can someone confirm that ? I assume the 110V or 220V is not an issue for the mA or Ah, or is it ?

[Butterfly]

another alternative: can I cascade the device that has the backup battery unit with a normal computer UPS ? so it would be a cascade of backup unit ? I read somewhere that was a big "no no"

[Camel Toe]

Here's what I know.

Amperage is lower, all else being equal, at 220 than 110. If you've ever noticed in 220-Volt countries the power cords are a lot thinner.

I once bought a 220 to 110 transformer at a typical Chinese hardware store for 200B. It lasted about 2 years.

[CharleyFarley]

Ohms law

[Mid]

^

looks more like sods law to me

[crippen]

5 th line down

Mu1RU2B7nYeFQdi9rHfZR1JAwDyyX9G1CzQgk6ryXJLSX4kk7k incorrect ,should be
Mu1RU2B7ny........................................ .........................

[CharleyFarley]

^^ sorry about that, can't read my own handwriting

[crippen]

If the charger is 110v,must only be used on that voltage
.......................220v,...................... ..............220v

As regarding the new battery size,just bung it in the circuit.Chances are the existing charger will have a regulator in it to limit the current to prevent damage to either itself or the battery.Make sure the charger is well ventalated and don't disappear of to a political rally leaving it on.!Why do you want to 'cascade' this and the UPS???

[DaffyDuck]

^ ok, but the charger is in 110V, so 1.2VA under 220 would be what under 110 ? 2.4VA ? so that would actually double the damage ?

It'll be the square root of a third of that (Ohm's law) so you (and your vibrator charger) will be fine. Knock yourself out!

Wow, this thread is hilarious -- is Butterfly aspiring to become the new Scampy, now that SCampy allegedly gone to become Japan's problem..?

[Butterfly]

I thought you had me on ignore Quack Quack

Quack Quack !!!

[slackula]

Did you plug it in yet, wimp?

[crippen]

Wonder if he is trying to make a bomb to blow the reds up??

[Butterfly]

Did you plug it in yet, wimp?

love, did you get my PM ? I am waiting for your vibrator instructions

[Butterfly]

I got this nice answer by Lom, which makes a lot of sense. Just wanted another confirmation or maybe a second opinion.

Thanks Lom btw

Your primary voltage is of no interest, it is as you say transformed down to 6V secondary.

The capacity in time is measured in AH, the 4.5AH battery will in theory keep up for 4.5 hours if you draw 1A out of it and 9 hours if you draw 0.5A.
There is also a max rating for the top current you can draw from the battery, 0.36A versus 1.2A for the other. The difference between them is 333%...

Top current and capacity is dependant on the area size of the lead plates so I guess the 1.2A battery is quite a bit bigger than the old one unless the mfgr has found some tricky way to organize the lead plates and packing more of them into the same size battery

Since the new battery has a bigger lead plate area, can give out a higher current, then it will also require a higher charging current and this is where it can go wrong for you.
Modern electronics does rarely have reserves, components in the charger are prolly not rated higher than needed for charging your old battery. The new battery will draw more from the charger so there is a risk that it will give out black smoke...