Re chargable batteries - quick query.

welshdeedee

I have a Varta 15 minute battery charger and now I'm finding it almost impossible to buy replacement 15 minute batteries.

Having read a review on Amazon, can I use these batteries instead...? Will they charge in 15 minutes?

http://www.amazon.co.uk/Uniross-AA-2700mAh-Performance-Batteries/dp/B0013IOCO8/ref=cm_cr_pr_product_top

Any advice or suggestions, many thanks.

kwikbreaks

What capacity were the original batteries?

I'd guess you'd need to be charging those at a rate of ~15A for 15 minutes to put 2700maH (2.7AH) into them and I can't see that the charger could do that and if it did those batteries would overheat and leak.

Stompa

kwikbreaks wrote: »

I'd guess you'd need to be charging those at a rate of ~15A for 15 minutes to put 2700maH (2.7AH) into them and I can't see that the charger could do that and if it did those batteries would overheat and leak.

This is quite entertaining:

http://www.youtube.com/watch?v=gG6rta4PuSM

welshdeedee

kwikbreaks wrote: »

What capacity were the original batteries?

I'd guess you'd need to be charging those at a rate of ~15A for 15 minutes to put 2700maH (2.7AH) into them and I can't see that the charger could do that and if it did those batteries would overheat and leak.

Thanks for responding, they were 2100maH.

This particular charger has a fan noisy but effective.

kwikbreaks

2100ma eneloop type batteries are quite common and 7dayshop sell own brand ones - http://www.7dayshop.com/catalog/product_info.php?cPath=777_3&products_id=107341

I personally wouldn't expect them to last all that long at that sort of charge rate and also wasn't convinced by the cheeky chappie video who didn't measure the charge rate supplied convincingly at all and didn't account for the inefficiency in recharging them assuming that 2100mah cells would be fully charged in an hour at 2100ma in his introductory spiel.

welshdeedee

OK thanks, would any brand charge in 15 minutes then as long as they were 2100ma?

kwikbreaks

If the originals did then the replacements should. Where the danger lies is in the batteries being naffed up by the heat generated by that sort of charge rate (which explains the fan). Charging batteries that quick is not going to do them any good at all regardless of brand.

Having a 15min recharge time is obviously handy but keeping a spare set constantly charged (which the Eneloop type with a low self-discharge rate permits) gives a 0 minute recharge time unless you are using them faster than you can charge them in which case an extra set or sets would be needed.

welshdeedee

The original batteries state on them '15 minute charge and go' any replacement I get now will not specify this. Are they different in anyway?

But if I understand you correctly the 2100ma eneloop type maybe ok to try?