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Are you sure it's lead-acid? (same as auto battery?) /quote]

It says on the battery & numbnut "how to use instructions" its a lead acid sealed battery.
The original chargers both 12v torch 2x6v & 1x6v vacuum batteries went dead - plug wire sheared off one - other i guess burnt out.
Bought a new multi volt 2v-6v-12 v charger.

The vacuum battery indicted via 4 green lites = fully charged their was one green lite remaining on the old battery. I bought a new 6v battery for the vacuum cleaner & new 2v-6v-12v charger.
Nine hours(now)charging the single 6v battery & the new charger is still showing a green charge lite.

Thinking maximum six hours should charge one 6v battery - on charge now for nine hours.?

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According to him, some chargers have a safety circuit that will only charge a battery that's within a specified range of the charging voltage selected. If you're outside of that range, the charger assumes there's something wrong with the battery and simply won't do anything. Since you're dealing with a new battery and a new charger,

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I think you're probably right after ten hours my VOM is reading 4.6V. I took the battery of charge and installed it in the vacuum cleaner, their are four led power lights and all are lit & vac is lifting dirt OK!

The other two 6v torch batteries are linked to give 12v light power so charging them at 12V - been on charge for ten hours both are only showing 10.3V give them another few hrs.
Could be the nature of the beast just a slow charger.

BillJeffy.
Sealed lead-acid
During the mid 1970s, researchers developed a maintenance-free lead-acid battery that can operate in any position. The liquid electrolyte is gelled into moistened separators and the enclosure is sealed. Safety valves allow venting during charge, discharge and atmospheric pressure changes.

Driven by different market needs, two lead-acid systems emerged: The small sealed lead-acid (SLA), also known under the brand name of Gelcell, and the larger Valve-regulated-lead-acid (VRLA). Both batteries are similar. Engineers may argue that the word 'sealed lead-acid' is a misnomer because no rechargeable battery can be totally sealed.
Unlike the flooded lead-acid battery, both SLA and VRLA are designed with a low over-voltage potential to prohibit the battery from reaching its gas-generating potential during charge because excess charging would cause gassing and water depletion. Consequently, these batteries can never be charged to their full potential. To reduce dry-out, sealed lead-acid batteries use lead-calcium instead of the lead-antimony.

The optimum operating temperature for the lead-acid battery is 25*C (77*F). Elevated temperature reduces longevity. As a guideline, every 8?C (15*F) rise in temperature will cut the battery life in half. A VRLA, which would last for 10 years at 25*C (77*F), will only be good for 5 years if operated at 33*C (95*F). Theoretically the same battery would last a little more than one year at a desert temperature of 42*C (107*F).


Figure 1: Sealed lead-acid battery

The sealed lead-acid battery is rated at a 5-hour (0.2) and 20-hour (0.05C) discharge. Longer discharge times produce higher capacity readings because of lower losses. The lead-acid performs well on high load currents.

BatteryUniversty.Com
Lots of info on that site about all batteries.

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