Has anyone tried these battery packs ?

[Sadsilence]

No experience with it so far but a nice idea. Wish I would have come along it before.

I was looking for a posibility to use RTU cells with my classics as self discharge rate of normal NiMHs and NiCDs forces you to reload packs every 3 months, no matter how often you use your calculator(s).

Normal AA cells does not fit into original pack case cause of high tops. But if you do not mind open your existing battery pack case and replace cells there is a already prebuild pack:

tecxus AA-3 RTU Pack

e.g.
http://www.reichelt.de/Batteries-NiMH-So...ANGUAGE=EN

or
http://www.amazon.de/Tecxus-NiMh-Akku-mi...s=aa-3+rtu

Really high quality flat top cells pack for around 10 bucks. Just open case, remove contact tails from original pack carefully with pliers , clean them and arrange them correctly in case together with tecxus pack. You even do not have to (of course you can) solder tails as pressure is enough for contact and closed case with a drop of super glue prevents any accidental shift.

One charge is good enough for a 12 hour timer test with HP 45.

Nominal and real capacity: 2100 mAh
Recharge time for discharged pack with AC adapter: 48 hours
Recharge time for discharged pack with external rc battery charger: 2h 15 min

Best regards,

Werner