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Those 3.7v 18650 batteries will charge higher than that. The 3.7v is a nominal voltage & they charge to ~4.2v so 3 would do it.
Li ion chargers cut out at around 4.3v/cell to prevent overcharging & protection circuits prevent discharge going lower than about 3.2v. So li ions will output ~3.2v to 4.2v per cell over their usefull charge to discharge cycle.
The 12v li ion packs your buying will likely contain 3 x 3.7v li ion cells but if you read the rated output (if its on them) it should be something like 10.8v to 12.6v
Li ion cells use the nominal value of 3.7v because its about where the battery/cell spends most of its life during charge > discharge cycle.
These ones are sold as 10.8v https://www.batteriesdirect.com.au/mobile/shop/product/27374/licb-18650-3s1p-hc-f.html but max charge would be 12.6v.
The ones I posted above might be slightly high {) There are examples of people using higher voltage packs with the Sovereign GT with the thinking it's internally regulated like a lot of detectors but yeah I'd probably stick to around 12v to if it was me.
Li ion chargers cut out at around 4.3v/cell to prevent overcharging & protection circuits prevent discharge going lower than about 3.2v. So li ions will output ~3.2v to 4.2v per cell over their usefull charge to discharge cycle.
The 12v li ion packs your buying will likely contain 3 x 3.7v li ion cells but if you read the rated output (if its on them) it should be something like 10.8v to 12.6v
Li ion cells use the nominal value of 3.7v because its about where the battery/cell spends most of its life during charge > discharge cycle.
These ones are sold as 10.8v https://www.batteriesdirect.com.au/mobile/shop/product/27374/licb-18650-3s1p-hc-f.html but max charge would be 12.6v.
The ones I posted above might be slightly high {) There are examples of people using higher voltage packs with the Sovereign GT with the thinking it's internally regulated like a lot of detectors but yeah I'd probably stick to around 12v to if it was me.