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| How to replace 9V battery with 1.2V Cell? |
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| mvs:
--- Quote from: mariush on November 06, 2018, 09:59:20 pm ---Another example would be TPS61220 ... up to 6v output voltage with high efficiency and very low quiescent currents ..datasheet says typical 5uA --- End quote --- TI makes a bit marketing with numbers here :) 5µA is quiescent current that flows throught Vout pin (internals of ultra low voltage step up converters are usually powered from Vout rail). To get idea about real current consumption from battery, one should use Figure 8 of the Datasheet. And even then, TI have not used any feedback divider for TPS61220. :( |
| thm_w:
The lithium 9V are incredibly good, at least from what I've seen in my DMM/LCR meter. Also you don't need to get one with an integrated charger if you have an old 9V battery charger. Some are available that you trickle charge, then when it hits ~8.4V it will shunt the charge internally. So just use a low current charger (fast charge would probably blow the thing up). But USB is convenient too. https://www.aliexpress.com/item/2pcs-Soshine-Power-Battery-6F22-9V-Li-ion-Lithium-650mAh-Chemistry-Rechargeable-Battery-For-Electronic-Instruments/32844425337.html For comparison a 9V nimh is 200-250mAh. |
| malagas_on_fire:
The NiMH 9V batteries or rated 8.4V although have low capacity as 220mAh they quite accept well the trickle charge from that old chargers, lets say 22mA to 44mA, doesn't need special transport as lithium batteries supposelly required as well safety, but looses when demanding current and capacity are required. Watch out for temperature range of the appliance lithium doesn't like too much heat has well. About the boost circuit remember the teardown of the 9V batteries from dave :P One of them has multiple cells of 1.2 V while the other is a solid cell. |
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