Look for a compatible battery with the right form factor in http://www.bhphotovideo.com/c/search?sts=ma&pn=8&N=0&Ntt=coby+TF-DVD1023+replacement+battery
Please note there is a recall in battery dated 2009. http://www.cpsc.gov/en/Recalls/2010/Coby-Electronics-Recalls-Rechargeable-Batteries-Sold-with-Portable-DVDCDMP3-Players-Due-to-Fire-Hazard
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Look for a compatible battery with the right form factor in
http://www.bhphotovideo.com/c/search?sts=ma&pn=8&N=0&Ntt=coby+TF-DVD1023+replacement+battery
Please note there is a recall in battery dated 2009.
http://www.cpsc.gov/en/Recalls/2010/Coby-Electronics-Recalls-Rechargeable-Batteries-Sold-with-Portable-DVDCDMP3-Players-Due-to-Fire-Hazard