The issue is that the internal resistance of the cells has crept up to a point that the BQ-CC17 detects that they are no longer good cells, so refuses to charge them. It does this for a couple of reasons:

1. High IR could indicate that you are trying to charge alkaline cells, so the charger rejects them.

2. The BQ-CC17 uses a 25% duty cycle for each slot. It actually charges AAA cells at 600mA (and AA at 1200mA), but does it 25% of the time, for an effective charge rate of 150mA (or 300mA for AA). 600mA is too fast a charge for cells with high internal resistance, so it rejects them.

Anyway, trying to charge your cells first with a dumb charger won’t help if you later want to finish with the BQ-CC17. Your only option is to use a dumb charger for the full charge, or try a different smart charger that can use a real charge less than 600mA.

IMO, I’d just use a dumb charger (everyone should have one for these purposes). It may be tough on the cells, but they’re not good cells anyway.

Finally, they may not be real Eneloops than Sony uses, or they may not be grade A cells. You’re right that it’s unusual for real Eneloop cells only 3 years gold to develop high internal resistance, unless they’ve been used for hundreds of full cycles.

Thanks for the comprehensive explanation, I’ll get a cheap dumb charger and see if the BQ-CC17 can finish the charging. I mostly used the AAA batteries on the cordless phone, I wonder if they were cycled for hundred of times.

The only time a dumb charger should be needed is if you discharge to zero volts and the smart charger rejects it. The dumb charger generally only needs a minute or 2 to put enough voltage into the cell to be ready for the smart charger. If it still won’t, you can ZAP it (a short quick jolt from a full battery matching polarity). If that doesn’t work, the cell is a dud.

The other time they are useful is if the internal resistance is so high the smart charger continually rejects or terminates the cell. You can then just use the dumb charger…but, that cell is pretty much on the way out and only suitable for ‘trash’ work.

There are LOTS of Panasonic chargers. Mine will start a zero volt cell OK, and generally charge OK, but I seldom use them with several better chargers available.

ksio89 wrote:

Thanks for the comprehensive explanation, I’ll get a cheap dumb charger and see if the BQ-CC17 can finish the charging. I mostly used the AAA batteries on the cordless phone, I wonder if they were cycled for hundred of times.

That could be it. If you use your phones a lot, it would be quite possible for the cells to get worn out after 3 years of use. Another possibility is the phone doesn’t stop the charge when the battery is full; it just continually trickle-charges, which would be tough on the battery.

BTW, the BQ-CC17 won’t finish the charge. They just detect the high internal resistance and refuse to charge them any more.

A dumb charger will just continually charge the cells for 10 hours (or something). It might over-charge them, which is hard on the cells, but they’re on their last legs anyway.

I’m pretty sure if you’ve been using them in a portable phone they are shot. That phone is very likely a dumb charger-it never stops charging at a low rate. Eneloops are not a good choice for that application. LSD cells don’t take well to trickle charging, as HJK has pointed out numerous times in his charger reviews. You want an ‘old school/standard’ NiMh or even NiCad for that.

Or….have you just been trying to charge them in a cordless phone, not use them in the phone?
If so, what kind of use do they get? There are some things that can be hard on any battery.

Ah, you never said they were in a portable phone.

What you want is either a NiCD cell or a lithium ion battery pack limited to 3,9V.

These kind of phones tend to kill cells.

flydiver wrote:

I’m pretty sure if you’ve been using them in a portable phone they are shot. That phone is very likely a dumb charger-it never stops charging at a low rate. Eneloops are not a good choice for that application. LSD cells don’t take well to trickle charging, as HJK has pointed out numerous times in his charger reviews. You want an ‘old school/standard’ NiMh or even NiCad for that.

Or….have you just been trying to charge them in a cordless phone, not use them in the phone?
If so, what kind of use do they get? There are some things that can be hard on any battery.

Just to make it clear, I have never charged the batteries with them inside the cordless phone or even let the phone connected to the base while the Sony batteries were inside the phone, because I knew the phone charger was a dumb one.

As soon as I saw the phone had turned off, I placed the Sony batteries in the BQ-CC17 and then put them back in the phone once they were fully charged. It’s only after the Panasonic charger started rejecting them that I begun to use the cordless phone charger to charge the batteries.

Hello.

I have 2 sets of Enloop rechargeable batteries (HR-3UTGA) but from different dates. I’ve been using them in my laptop wireless mouse and my camera’s flash. I also have a set of 4 AAA Enloop batteries (HR-4UTGB) that I use on my Casio calculator and a remote controller (IPTV box).

I have bought this Technoline BC700 charger to charge them. Is this charger appropriated? I bought it because of its features and because I found a few nice reviews about it.

Yes it ok , but it sometimes won’t terminate at 200ma ( like almost all chargers ) mine has only missed termination 3 times ,I use 500ma for AAA’s & 700ma for AA’s.
edit , but mine is made by lacrosse.
I would disregard most amazon reviews because there are alot of sellers on amazon that get the reviewers to pay for reviewed stuff & reimburses the reviewer if it’s a good review.

do you know something about
https://eu.nkon.nl/rechargeable/aa-size/4-aa-fujitsu-blauw-1900mah.html
and https://eu.nkon.nl/rechargeable/aaa-size/4-aaa-fujitsu-blauw-750mah.html batteries?

spec. are totaly same as for white eneloops and white fujitsu

meh, still good buy imho

atleast, they are from japan

many thanks

Good looking! 

Thx for the info

Yeah.. That is very nice.

The problem is…. Were to buy them… And where to buy them at a reasonable price.

Today…. Difficult to get Japan made eneloops…

Yeah… At overkill prices XP

Yes.. Shipping is one of the problems for some people XP

They may or not may not send via letter.

I can buy ikealoops locally for 5€ a pack of 4*AAA 900mAh and 7€ a pack of 4*AA 2450mAh. I dont know if they are still made in japan… Ikea store is about 30km from my house.

Thanks!!

I have seen what I think are new rebadged eneloops…

I can take a photo.

They are “energizer recharge” with silver wrapping and green “recharge” letters.

They say “Made in Japan for energizer brands llc”

They say 700mAh.

Datecode says “ 0519CPOQ”

…

They should be eneloop… Only one manufacturing plant in Japan…

..

On the same store.. “Energizer recharge extreme”: made in China

I have to go to the store again to take photos of the package. I threw it away. I only have the batteries without the packaging.