How to charge this battery?

Question

Do it yourself

Good afternoon
There are 2 batteries as in the photo

. Can they be connected together and charged from a car charger (~ 10% current)?
And are they suitable for organizing lighting? For example, a small LED lamp 10W 12V?
Thanks in advance

Answer 1

These are ordinary maintenance-free batteries from an uninterruptible power supply.
The car charger rolls, but the charging current, it turns out, is about 3 amperes (or better, 1 ampere). Is there such a thing?
If connected together, then in parallel, doubling the current. Alone is better though.
12 volts 10 watts give a little less than an ampere, such batteries usually have about 7 amp-hours, and one bulb on one battery will work 7 hours.
UPD. Corrected the value of the current.

Answer 2

Why not? Conventional lead battery 7 Ah - two in parallel, 1.5 A charge current.
Only in fact they will be 13 - 14 V when fully charged - the 12-volt bulb will not burn out?

Answer 3

The battery is from an uninterruptible power supply, it is always stupidly fed to it (even when the uninterruptible power supply is turned off, but not from the mains :)) - 13.5 V.
If you need to charge faster, then you need to increase the voltage-current, and then control the temperature in order to acc. didn't rush.
I charged these, connected them to the uninterruptible power supply, the uninterruptible power supply itself did not turn on with the button.