If the battery is more then ~3-4 years old, try replacing the battery. Modern lithium batteries don’t last as long because there are more onboard nannies on the BMS when compared to older ones that let you charge it with a dangerous fault. In most cases, a persistent charging light (or runtime issues) indicates a battery fault. '''This doesn’t always fix the problem, but it’s cheap to try and is easier then trying to repair the calculator’s PCB. If the issue persists, the board is bad and the battery is completely ruled out.'''
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I don’t know if TI sells the battery directly or you need to use a 3rd party to get one, but the guide to replace it can be found [guide|63973|here]. The part number that worked out for me is '''3.7L1200SPA.''' I found what appears to be the OEM battery on [https://www.amazon.com/Rechargeable-Battery-Nspire-CAS-MODEL/dp/B00SMRLU3O|Amazon]. There is a possibility you will need [https://www.amazon.com/Texas-Instruments-Rechargeable-Calculator-Guerrilla/dp/B012H2GWPA/ref=pd_lpo_vtph_229_tr_t_2?_encoding=UTF8&psc=1&refRID=P8V0XBF9C4RJTK940C7J|this battery] since TI appears to use 2 different types.
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I don’t know if TI sells the battery directly or you need to use a 3rd party to get one, but the guide to replace it can be found [guide|63973|here]. If for some reason the battery is no longer available from the provided link, the part number that worked out for me is '''3.7L1200SPA.''' I found what appears to be the OEM battery on [https://www.amazon.com/Rechargeable-Battery-Nspire-CAS-MODEL/dp/B00SMRLU3O|Amazon]. There is a possibility you will need [https://www.amazon.com/Texas-Instruments-Rechargeable-Calculator-Guerrilla/dp/B012H2GWPA/ref=pd_lpo_vtph_229_tr_t_2?_encoding=UTF8&psc=1&refRID=P8V0XBF9C4RJTK940C7J|this battery] since TI appears to use 2 different types.
If the battery is more then ~3-4 years old, I’d try the battery first. Modern lithium batteries don’t last as long as their older counterparts from years ago when there were fewer BMS safeties. Usually, a persistent charging light (or runtime issues) indicates a battery fault. '''This doesn’t always fix the problem, but it’s cheap to try and is easier then trying to repair the calculator’s PCB and completely rules out a bad battery.'''
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If the battery is more then ~3-4 years old, try replacing the battery. Modern lithium batteries don’t last as long because there are more onboard nannies on the BMS when compared to older ones that let you charge it with a dangerous fault. In most cases, a persistent charging light (or runtime issues) indicates a battery fault. '''This doesn’t always fix the problem, but it’s cheap to try and is easier then trying to repair the calculator’s PCB. If the issue persists, the board is bad and the battery is completely ruled out.'''
I don’t know if TI sells the battery directly or you need to use a 3rd party to get one, but the guide to replace it can be found [guide|63973|here]. The part number that worked out for me is '''3.7L1200SPA.''' I found what appears to be the OEM battery on [https://www.amazon.com/Rechargeable-Battery-Nspire-CAS-MODEL/dp/B00SMRLU3O|Amazon]. There is a possibility you will need [https://www.amazon.com/Texas-Instruments-Rechargeable-Calculator-Guerrilla/dp/B012H2GWPA/ref=pd_lpo_vtph_229_tr_t_2?_encoding=UTF8&psc=1&refRID=P8V0XBF9C4RJTK940C7J|this battery] since TI appears to use 2 different types.
If the battery is more then ~3-4 years old, I’d try the battery first. Modern lithium batteries don’t last as long as their older counterparts from years ago when there were fewer BMS safeties. Usually, a persistent charging light (or runtime issues) indicates a battery fault.
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If the battery is more then ~3-4 years old, I’d try the battery first. Modern lithium batteries don’t last as long as their older counterparts from years ago when there were fewer BMS safeties. Usually, a persistent charging light (or runtime issues) indicates a battery fault. '''This doesn’t always fix the problem, but it’s cheap to try and is easier then trying to repair the calculator’s PCB and completely rules out a bad battery.'''
I don’t know if TI sells the battery directly or you need to use a 3rd party to get one, but the guide to replace it can be found [guide|63973|here]. The part number that worked out for me is '''3.7L1200SPA.''' I found what appears to be the OEM battery on [https://www.amazon.com/Rechargeable-Battery-Nspire-CAS-MODEL/dp/B00SMRLU3O|Amazon]. There is a possibility you will need [https://www.amazon.com/Texas-Instruments-Rechargeable-Calculator-Guerrilla/dp/B012H2GWPA/ref=pd_lpo_vtph_229_tr_t_2?_encoding=UTF8&psc=1&refRID=P8V0XBF9C4RJTK940C7J|this battery] since TI appears to use 2 different types.
If the battery is more then ~3-4 years old, I’d try the battery first. Modern lithium batteries don’t last as long as their older counterparts from years ago when there were fewer BMS safeties. Usually, a persistent charging light (or runtime issues) indicates a battery fault.
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I don’t know if TI sells the battery directly or you need to use a 3rd party to get one, but the guide to replace it can be found [guide|63973|here]. The part number that worked out for me is '''3.7L1200SPA.''' I found what appears to be the OEM battery on [https://www.amazon.com/Rechargeable-Battery-Nspire-CAS-MODEL/dp/B00SMRLU3O|Amazon].
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I don’t know if TI sells the battery directly or you need to use a 3rd party to get one, but the guide to replace it can be found [guide|63973|here]. The part number that worked out for me is '''3.7L1200SPA.''' I found what appears to be the OEM battery on [https://www.amazon.com/Rechargeable-Battery-Nspire-CAS-MODEL/dp/B00SMRLU3O|Amazon]. There is a possibility you will need [https://www.amazon.com/Texas-Instruments-Rechargeable-Calculator-Guerrilla/dp/B012H2GWPA/ref=pd_lpo_vtph_229_tr_t_2?_encoding=UTF8&psc=1&refRID=P8V0XBF9C4RJTK940C7J|this battery] since TI appears to use 2 different types.
If the battery is more then ~3-4 years old, I’d try the battery first. Modern lithium batteries don’t last as long as their older counterparts from years ago when there were fewer BMS safeties. Usually, a persistent charging light (or runtime issues) indicates a battery fault.
I don’t know if TI sells the battery directly or you need to use a 3rd party to get one, but the guide to replace it can be found [guide|63973|here]. The part number that worked out for me is '''3.7L1200SPA.''' I found what appears to be the OEM battery on [https://www.amazon.com/Rechargeable-Battery-Nspire-CAS-MODEL/dp/B00SMRLU3O|Amazon].