Oticon Standard charger

@3dslides said:

I am curious to know the capacity of the Smart Charger’s built-in battery.

@prodigyplace said:

I believe they say it is good for 3 charges of the aids.

My understanding is that he’s not really asking “how many charge cycles can the Smart Charger’s built-in power bank battery can fully charge a pair of depleted aids.” That’s already well known information that can be found in the manual.

I think what he’s really asking is if he has an external portable power bank (he indicated he has one which is rated at 10 Ah and can deliver 5 Volts output. Then if he plugs the SmartCharger into this external portable power bank of his instead of using the wall power unit (like when he has no access to wall power), how many charging cycles of the hearing aids can he get out of his 10 Ah external portable power bank? The answer (as I have worked out the math in a previous post) is at least 6 hearing aids charging cycles, because his depleted SmartCharger’s battery can be fully recharged twice from his 10 Ah external portable power bank.

I can get 4 full charges from my smart charger without it being recharged itself.I don’t recommend doing so if you can avoid it.

@3dslides said:

This charger told me the answer to my question re: the battery capacity. It says on the bottom, 2595 mAh / 9.3Wh. Which means, if I ever did need to use my 10,000 mAh power bank for the task, it would probably supply another 10+ days of charges. Nice!

Ah, this actual info (9.3 Wh battery capacity) is much less than my conservative estimate of 20 Wh capacity. That is because I assumed worst case 5 Vdc times 1 Amp rating = 5 W * 4 hours to fully charge from the wall power = 20 Wh.

But apparently if the internal battery is only 9.3 Wh in capacity (let’s round it up to 10 Wh for simplicity’s stake), then the draw is not 1 Amp but only roughly 0.5 Amp for 4 hours (although spec’ed at 1A requirement). Or if the draw is actually 1 Amp as spec’ed, then maybe it only takes 2 hours to complete a full charge in reality although Oticon conservatively spec it to be 4 hours to reach full charge.

At any rate, because the charging process is not linear 100% of the time, because the charging speed can slow down significantly once the state of charge reaches 80%, such that the 80-100% charge rate can be much slower than the 0-80% charge rate, I can see why Oticon may want to conservatively spec out 4 hours for a full charge instead of just 2.

Either way, if I estimated 6 days before, now it becomes roughly 12 days. So @3dslides 's estimate of 10+ days of charges is spot on!

Exactly @Volusiano & @3dslides … Exactly!